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Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 44,538	$ 41,726
Debt Securities, Available-for-sale, Allowance for Credit Loss	(16)	(21)	$ (12)	$ (1)
Gross Unrealized Gains, fixed maturities, available-for-sale	272	418
Gross Unrealized Losses, fixed maturities, available-for-sale	(2,227)	(2,305)
Total fixed maturities	42,567	39,818
Amortized Cost
One year or less	1,308	1,526
Over one year through five years	9,564	9,670
Over five years through ten years	7,687	6,568
Over ten years	10,208	9,370
Subtotal	28,767	27,134
Mortgage-backed and asset-backed securities	15,771	14,592
Fair Value
One year or less	1,298	1,501
Over one year through five years	9,414	9,433
Over five years through ten years	7,334	6,211
Over ten years	9,368	8,851
Subtotal	27,414	25,996
Mortgage-backed and asset-backed securities	15,153	13,822
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,948	3,347
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	28	18
Gross Unrealized Losses, fixed maturities, available-for-sale	(39)	(45)
Total fixed maturities	3,937	3,320
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,237	3,104
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	13	3
Gross Unrealized Losses, fixed maturities, available-for-sale	0	(17)
Total fixed maturities	3,250	3,090
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	2,976	3,466
Debt Securities, Available-for-sale, Allowance for Credit Loss	(13)	(12)	(10)	0
Gross Unrealized Gains, fixed maturities, available-for-sale	21	19
Gross Unrealized Losses, fixed maturities, available-for-sale	(248)	(348)
Total fixed maturities	2,736	3,125
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	21,555	18,691
Debt Securities, Available-for-sale, Allowance for Credit Loss	(3)	(9)	(2)	(1)
Gross Unrealized Gains, fixed maturities, available-for-sale	117	197
Gross Unrealized Losses, fixed maturities, available-for-sale	(1,033)	(1,013)
Total fixed maturities	20,636	17,866
Foreign government/government agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	500	583
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0	$ 0	$ 0
Gross Unrealized Gains, fixed maturities, available-for-sale	3	6
Gross Unrealized Losses, fixed maturities, available-for-sale	(23)	(27)
Total fixed maturities	480	562
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	5,574	6,207
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	77	131
Gross Unrealized Losses, fixed maturities, available-for-sale	(347)	(299)
Total fixed maturities	5,304	6,039
Residential mortgage-backed securities ("RMBS")
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	5,610	4,675
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	13	18
Gross Unrealized Losses, fixed maturities, available-for-sale	(393)	(406)
Total fixed maturities	5,230	4,287
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,138	1,653
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	0	26
Gross Unrealized Losses, fixed maturities, available-for-sale	(144)	(150)
Total fixed maturities	$ 994	$ 1,529

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