IndexFair Value Guarantee [Member]
| Name | MarketValueGuaranteeMember |
|---|---|
| Namespace | http://fasb.org/us-gaap/2020-01-31 |
| Prefix | us-gaap |
| Data type | nonnum:domainItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | None |
| Nillable | True |
| Abstract | True |
Labels
| Text | Lang | Role | Container role |
|---|---|---|---|
| Fair Value Guarantee [Member] | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Guarantee of fair value of financial or nonfinancial asset owned by the guaranteed party. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
References
| Name | Value | Role |
|---|---|---|
| Publisher | FASB | http://fasb.org/us-gaap/role/ref/legacyRef |
| Name | Accounting Standards Codification | http://fasb.org/us-gaap/role/ref/legacyRef |
| Topic | 460 | http://fasb.org/us-gaap/role/ref/legacyRef |
| SubTopic | 10 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Section | 55 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Paragraph | 2 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Subparagraph | (b) | http://fasb.org/us-gaap/role/ref/legacyRef |
| URI | http://asc.fasb.org/extlink&oid=121596127&loc=d3e12803-110250 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Publisher | FASB | http://fasb.org/us-gaap/role/ref/legacyRef |
| Name | Accounting Standards Codification | http://fasb.org/us-gaap/role/ref/legacyRef |
| Topic | 460 | http://fasb.org/us-gaap/role/ref/legacyRef |
| SubTopic | 10 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Section | 15 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Paragraph | 4 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Subparagraph | (a) | http://fasb.org/us-gaap/role/ref/legacyRef |
| URI | http://asc.fasb.org/extlink&oid=121548805&loc=d3e10037-110241 | http://fasb.org/us-gaap/role/ref/legacyRef |
Related Parent Concepts
| Name | Relation Type | Role | |
|---|---|---|---|
 | us-gaap:GuaranteeObligationsMember | parent-child | http://fasb.org/us-gaap/role/disclosure/CommitmentAndContingencies |
| us-gaap:GuaranteeObligationsMember | domain-member | http://fasb.org/us-gaap/role/disclosure/CommitmentAndContingenciesLossContingenciesTable |
| us-gaap:PaymentGuaranteeMember | parent-child | http://fasb.org/us-gaap/role/disclosure/Guarantees |
| us-gaap:PaymentGuaranteeMember | domain-member | http://fasb.org/us-gaap/role/disclosure/GuaranteesScheduleOfGuaranteeObligationsTable |