| r0.c0 | Energy index smaller or equal to zero point six/Forecast reporting year | bzk-ww-i:EnergyIndexSmallerOrEqualToZeroPointSix | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodCurrentEndDateParam |
| r0.c1 | Energy index smaller or equal to zero point six/Fifth forecast year | bzk-ww-i:EnergyIndexSmallerOrEqualToZeroPointSix | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodEndDateParam |
| r1.c0 | Energy index higher than zero point six and smaller or equal to zero point eight/Forecast reporting year | bzk-ww-i:EnergyIndexHigherThanZeroPointSixAndSmallerOrEqualToZeroPointEight | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodCurrentEndDateParam |
| r1.c1 | Energy index higher than zero point six and smaller or equal to zero point eight/Fifth forecast year | bzk-ww-i:EnergyIndexHigherThanZeroPointSixAndSmallerOrEqualToZeroPointEight | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodEndDateParam |
| r2.c0 | Energy index higher than zero point eight and smaller or equal to one point two/Forecast reporting year | bzk-ww-i:EnergyIndexHigherThanZeroPointEightAndSmallerOrEqualToOnePointTwo | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodCurrentEndDateParam |
| r2.c1 | Energy index higher than zero point eight and smaller or equal to one point two/Fifth forecast year | bzk-ww-i:EnergyIndexHigherThanZeroPointEightAndSmallerOrEqualToOnePointTwo | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodEndDateParam |
| r3.c0 | Energy index higher than one point two and smaller or equal to one point four/Forecast reporting year | bzk-ww-i:EnergyIndexHigherThanOnePointTwoAndSmallerOrEqualToOnePointFour | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodCurrentEndDateParam |
| r3.c1 | Energy index higher than one point two and smaller or equal to one point four/Fifth forecast year | bzk-ww-i:EnergyIndexHigherThanOnePointTwoAndSmallerOrEqualToOnePointFour | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodEndDateParam |
| r4.c0 | Energy index higher than one point four and smaller or equal to one point eight/Forecast reporting year | bzk-ww-i:EnergyIndexHigherThanOnePointFourAndSmallerOrEqualToOnePointEight | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodCurrentEndDateParam |
| r4.c1 | Energy index higher than one point four and smaller or equal to one point eight/Fifth forecast year | bzk-ww-i:EnergyIndexHigherThanOnePointFourAndSmallerOrEqualToOnePointEight | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodEndDateParam |
| r5.c0 | Energy index higher than one point eight and smaller or equal to two point one/Forecast reporting year | bzk-ww-i:EnergyIndexHigherThanOnePointEightAndSmallerOrEqualToTwoPointOne | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodCurrentEndDateParam |
| r5.c1 | Energy index higher than one point eight and smaller or equal to two point one/Fifth forecast year | bzk-ww-i:EnergyIndexHigherThanOnePointEightAndSmallerOrEqualToTwoPointOne | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodEndDateParam |
| r6.c0 | Energy index higher than two point one and smaller or equal to two point four/Forecast reporting year | bzk-ww-i:EnergyIndexHigherThanTwoPointOneAndSmallerOrEqualToTwoPointFour | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodCurrentEndDateParam |
| r6.c1 | Energy index higher than two point one and smaller or equal to two point four/Fifth forecast year | bzk-ww-i:EnergyIndexHigherThanTwoPointOneAndSmallerOrEqualToTwoPointFour | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodEndDateParam |
| r7.c0 | Energy index higher than two point four and smaller or equal to two point seven/Forecast reporting year | bzk-ww-i:EnergyIndexHigherThanTwoPointFourAndSmallerOrEqualToTwoPointSeven | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodCurrentEndDateParam |
| r7.c1 | Energy index higher than two point four and smaller or equal to two point seven/Fifth forecast year | bzk-ww-i:EnergyIndexHigherThanTwoPointFourAndSmallerOrEqualToTwoPointSeven | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodEndDateParam |
| r8.c0 | Energy index higher than two point seven/Forecast reporting year | bzk-ww-i:EnergyIndexHigherThanTwoPointSeven | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodCurrentEndDateParam |
| r8.c1 | Energy index higher than two point seven/Fifth forecast year | bzk-ww-i:EnergyIndexHigherThanTwoPointSeven | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodEndDateParam |
| r9.c0 | Energy index unknown/Forecast reporting year | bzk-ww-i:EnergyIndexUnknown | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodCurrentEndDateParam |
| r9.c1 | Energy index unknown/Fifth forecast year | bzk-ww-i:EnergyIndexUnknown | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodEndDateParam |
| r10.c0 | Number of independent units living space/Forecast reporting year | bzk-dpi-i:NumberOfIndependentUnitsLivingSpaceEnergyIndex | nl-types:nonNegativeInteger20ItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodCurrentEndDateParam |
| r10.c1 | Number of independent units living space/Fifth forecast year | bzk-dpi-i:NumberOfIndependentUnitsLivingSpaceEnergyIndex | nl-types:nonNegativeInteger20ItemType | instant | $BasisOfPreparationParam | bzk-ww-dm:NonDAEBActivitiesMember | $FinancialReportingPeriodFifthPeriodEndDateParam |