Deferred Policy Acquisition Costs and Value of Business Acquired - Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	$ 270	$ 122
Deferrals of commissions and expenses	14	13
Amortization:
Amortization, excluding unlocking(2)	(15)	(34)
Unlocking	(9)	(1)
Interest accrued	9	9
Net amortization included in the Condensed Consolidated Statements of Operations	(15)	26
Change due to unrealized capital gains/losses on available-for-sale securities	260	184
Ending balance	529	293
Movement Analysis Of Value of Business Acquired VOBA [Roll Forward]
Beginning balance	139	40
Deferrals of commissions and expenses	1	1
Amortization, excluding unlocking(2)	(8)	(30)
Unlocking	(14)	(1)
Interest accrued	6	6
Net amortization included in the Condensed Consolidated Statements of Operations	(16)	23
Change due to unrealized capital gains/losses on available-for-sale securities	202	163
Ending balance	326	181
Movement Analysis of Deferred Policy Acquisition Costs and Value of Business Acquired (VOBA) [Roll Forward]
Beginning balance	409	162
Deferrals of commissions and expenses	15	14
Amortization, excluding unlocking(2)	(23)	(64)
Unlocking	(23)	0
Interest accrued	15	15
Net amortization included in the Condensed Consolidated Statements of Operations	(31)	(49)
Change due to unrealized capital gains/losses on available-for-sale securities	462	347
Ending balance	855	$ 474
Deferred Policy Acquisition Costs, Impairment Loss	$ 2
Minimum
Movement Analysis of Deferred Policy Acquisition Costs and Value of Business Acquired (VOBA) [Roll Forward]
Value of Business Acquired (VOBA), Interest accrued percentage	7.00%	550.00%
Maximum
Movement Analysis of Deferred Policy Acquisition Costs and Value of Business Acquired (VOBA) [Roll Forward]
Value of Business Acquired (VOBA), Interest accrued percentage	7.00%	7.00%