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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 45,790	$ 44,538
Allowance for credit losses, fixed maturity, AFS	(14)	(16)	$ (18)	$ (21)
Gross Unrealized Gains, fixed maturities, available-for-sale	351	272
Gross Unrealized Losses, fixed maturities, available-for-sale	(1,923)	(2,227)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	44,204	42,567
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	4,317	3,948
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	40	28
Gross Unrealized Losses, fixed maturities, available-for-sale	(24)	(39)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	4,333	3,937
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,392	3,237
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	6	13
Gross Unrealized Losses, fixed maturities, available-for-sale	(2)	0
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,396	3,250
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	2,946	2,976
Allowance for credit losses, fixed maturity, AFS	(14)	(13)	(12)	(12)
Gross Unrealized Gains, fixed maturities, available-for-sale	26	21
Gross Unrealized Losses, fixed maturities, available-for-sale	(204)	(248)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	2,754	2,736
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	22,329	21,555
Allowance for credit losses, fixed maturity, AFS	0	(3)	$ (6)	$ (9)
Gross Unrealized Gains, fixed maturities, available-for-sale	179	117
Gross Unrealized Losses, fixed maturities, available-for-sale	(862)	(1,033)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	21,646	20,636
Foreign Govt./Govt. Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	492	500
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	6	3
Gross Unrealized Losses, fixed maturities, available-for-sale	(17)	(23)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	481	480
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	5,340	5,574
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	61	77
Gross Unrealized Losses, fixed maturities, available-for-sale	(371)	(347)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	5,030	5,304
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	5,855	5,610
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	28	13
Gross Unrealized Losses, fixed maturities, available-for-sale	(325)	(393)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	5,558	5,230
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,119	1,138
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	5	0
Gross Unrealized Losses, fixed maturities, available-for-sale	(118)	(144)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	$ 1,006	$ 994

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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