 | us-gaap:DepreciationNonproduction | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternative |
 | us-gaap:AmortizationOfDeferredChargesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternative |
 | us-gaap:OtherDepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternative |
 | us-gaap:DepletionOfOilAndGasProperties | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternative |
 | us-gaap:DepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternative |
 | us-gaap:DepreciationNonproduction | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternativeStatementTable |
 | us-gaap:AmortizationOfDeferredChargesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternativeStatementTable |
 | us-gaap:OtherDepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternativeStatementTable |
 | us-gaap:DepletionOfOilAndGasProperties | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternativeStatementTable |
 | us-gaap:DepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternativeStatementTable |
 | us-gaap:DepreciationNonproduction | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITs |
 | us-gaap:AmortizationOfDeferredChargesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITs |
 | us-gaap:OtherDepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITs |
 | us-gaap:DepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITs |
 | us-gaap:DepreciationNonproduction | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITsStatementTable |
 | us-gaap:AmortizationOfDeferredChargesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITsStatementTable |
 | us-gaap:OtherDepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITsStatementTable |
 | us-gaap:DepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITsStatementTable |
 | us-gaap:DepreciationNonproduction | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrusts |
 | us-gaap:AmortizationOfDeferredChargesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrusts |
 | us-gaap:OtherDepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrusts |
 | us-gaap:DepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrusts |
 | us-gaap:DepreciationNonproduction | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrustsStatementTable |
 | us-gaap:AmortizationOfDeferredChargesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrustsStatementTable |
 | us-gaap:OtherDepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrustsStatementTable |
 | us-gaap:DepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrustsStatementTable |
 | us-gaap:DepreciationNonproduction | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
 | us-gaap:AmortizationOfDeferredChargesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
 | us-gaap:OtherDepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
 | us-gaap:DepletionOfOilAndGasProperties | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
 | us-gaap:DepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
 | us-gaap:DepreciationNonproduction | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeStatementTable |
 | us-gaap:AmortizationOfDeferredChargesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeStatementTable |
 | us-gaap:OtherDepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeStatementTable |
 | us-gaap:DepletionOfOilAndGasProperties | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeStatementTable |
 | us-gaap:DepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeStatementTable |
 | us-gaap:DepreciationNonproduction | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInterestBasedRevenue |
 | us-gaap:AmortizationOfDeferredChargesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInterestBasedRevenue |
 | us-gaap:OtherDepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInterestBasedRevenue |
 | us-gaap:DepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInterestBasedRevenue |
 | us-gaap:DepreciationNonproduction | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInterestBasedRevenueStatementTable |
 | us-gaap:AmortizationOfDeferredChargesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInterestBasedRevenueStatementTable |
 | us-gaap:OtherDepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInterestBasedRevenueStatementTable |
 | us-gaap:DepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInterestBasedRevenueStatementTable |
 | us-gaap:DepreciationNonproduction | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInsuranceBasedRevenue |
 | us-gaap:AmortizationOfDeferredChargesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInsuranceBasedRevenue |
 | us-gaap:OtherDepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInsuranceBasedRevenue |
 | us-gaap:DepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInsuranceBasedRevenue |
 | us-gaap:DepreciationNonproduction | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInsuranceBasedRevenueStatementTable |
 | us-gaap:AmortizationOfDeferredChargesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInsuranceBasedRevenueStatementTable |
 | us-gaap:OtherDepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInsuranceBasedRevenueStatementTable |
 | us-gaap:DepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInsuranceBasedRevenueStatementTable |
 | us-gaap:DepreciationNonproduction | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeSecuritiesBasedIncome |
 | us-gaap:AmortizationOfDeferredChargesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeSecuritiesBasedIncome |
 | us-gaap:OtherDepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeSecuritiesBasedIncome |
 | us-gaap:DepreciationAndAmortization | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeSecuritiesBasedIncome |
 | us-gaap:DepreciationNonproduction | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeSecuritiesBasedIncomeStatementTable |
 | us-gaap:AmortizationOfDeferredChargesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeSecuritiesBasedIncomeStatementTable |
 | us-gaap:OtherDepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeSecuritiesBasedIncomeStatementTable |
 | us-gaap:DepreciationAndAmortization | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeSecuritiesBasedIncomeStatementTable |