Variable Annuity and Insurance Guarantees - General Information (Details) - GMAB	12 Months Ended
Dec. 31, 2021
Insurance guarantees
Maximum age of variable annuity contractholders	79 years
GMAB rider guarantees waiting period	10 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_NetAmountAtRiskByProductAndGuaranteeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration