Derivative Instruments - Aggregate Contractual Notional Amounts and Fair Values of Derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Assets
Fair Value	$ 226	$ 390
Liabilities
Fair Value	900	1,210
Freestanding derivatives
Derivative [Line Items]
Contractual/Notional Amount	87,005	117,657
Assets
Fair Value	173	341
Liabilities
Fair Value	884	1,176
Net Fair Value, Asset (Liability)	(711)	(835)
Freestanding derivatives | Cross-currency swaps
Derivative [Line Items]
Contractual/Notional Amount	1,687	1,665
Assets
Fair Value	114	123
Liabilities
Fair Value	134	116
Net Fair Value, Asset (Liability)	(20)	7
Freestanding derivatives | Equity index futures
Derivative [Line Items]
Contractual/Notional Amount	28,195	24,739
Assets
Fair Value	0	0
Liabilities
Fair Value	0	0
Net Fair Value, Asset (Liability)	0	0
Freestanding derivatives | Equity index put options
Derivative [Line Items]
Contractual/Notional Amount	11,000	26,000
Assets
Fair Value	55	59
Liabilities
Fair Value	0	0
Net Fair Value, Asset (Liability)	55	59
Freestanding derivatives | Interest rate swaps
Derivative [Line Items]
Contractual/Notional Amount	5,978	6,228
Assets
Fair Value	4	5
Liabilities
Fair Value	179	132
Net Fair Value, Asset (Liability)	(175)	(127)
Freestanding derivatives | Put-swaptions
Derivative [Line Items]
Contractual/Notional Amount	5,500	23,500
Assets
Fair Value	0	153
Liabilities
Fair Value	555	905
Net Fair Value, Asset (Liability)	(555)	(752)
Freestanding derivatives | Interest rate futures
Derivative [Line Items]
Contractual/Notional Amount	32,792	33,926
Assets
Fair Value	0	0
Liabilities
Fair Value	0	0
Net Fair Value, Asset (Liability)	0	0
Freestanding derivatives | Total return swaps
Derivative [Line Items]
Contractual/Notional Amount	1,853	1,599
Assets
Fair Value	0	1
Liabilities
Fair Value	16	23
Net Fair Value, Asset (Liability)	(16)	(22)
Embedded derivatives
Assets
Fair Value	0	0
Liabilities
Fair Value	2,982	2,090
Net Fair Value, Asset (Liability)	(2,982)	(2,090)
Embedded derivatives | Fixed index annuity embedded derivatives
Assets
Fair Value	0	0
Liabilities
Fair Value	858	866
Net Fair Value, Asset (Liability)	(858)	(866)
Embedded derivatives | Registered index linked annuity embedded derivatives
Assets
Fair Value	0	0
Liabilities
Fair Value	2,124	1,224
Net Fair Value, Asset (Liability)	(2,124)	(1,224)
Derivatives related to funds withheld under reinsurance treaties
Derivative [Line Items]
Contractual/Notional Amount	1,292	1,568
Assets
Fair Value	2,575	2,517
Liabilities
Fair Value	16	34
Net Fair Value, Asset (Liability)	2,559	2,483
Derivatives related to funds withheld under reinsurance treaties | Cross-currency swaps
Derivative [Line Items]
Contractual/Notional Amount	158	158
Assets
Fair Value	17	14
Liabilities
Fair Value	1	1
Net Fair Value, Asset (Liability)	16	13
Derivatives related to funds withheld under reinsurance treaties | Cross-currency forwards
Derivative [Line Items]
Contractual/Notional Amount	1,134	1,410
Assets
Fair Value	36	35
Liabilities
Fair Value	15	33
Net Fair Value, Asset (Liability)	21	2
Derivatives related to funds withheld under reinsurance treaties | Funds withheld embedded derivative
Assets
Fair Value	2,522	2,468
Liabilities
Fair Value	0	0
Net Fair Value, Asset (Liability)	2,522	2,468
Derivative assets
Derivative [Line Items]
Contractual/Notional Amount	88,297	119,225
Assets
Fair Value	2,748	2,858
Derivative liabilities
Liabilities
Fair Value	3,882	3,300
Derivative
Liabilities
Net Fair Value, Asset (Liability)	$ (1,134)	$ (442)