Reinsurance - GMIB Reinsurers (Details) - GMIB - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Berkshire | Secured | GMIB Assets | Collateralization risk
Ceded Credit Risk [Line Items]
Concentration percentage	100.00%
Liberty Re (Bermuda) Ltd. | Secured | GMIB Assets | Collateralization risk
Ceded Credit Risk [Line Items]
Concentration percentage	100.00%
Other Contract [Member]
Ceded Credit Risk [Line Items]
GMIB recoverables	$ 489	$ 601
Other Contract [Member] | Berkshire
Ceded Credit Risk [Line Items]
GMIB recoverables	230	283
Other Contract [Member] | Sun Life Assurance Company of Canada
Ceded Credit Risk [Line Items]
GMIB recoverables	136	167
Other Contract [Member] | Liberty Re (Bermuda) Ltd.
Ceded Credit Risk [Line Items]
GMIB recoverables	$ 123	$ 151