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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 47,036		$ 46,871
Allowance for credit losses, fixed maturity, AFS	(16)	$ (16)	(16)	$ (14)	$ (14)	$ (16)
Gross Unrealized Gains, fixed maturities, available-for-sale	349		610
Gross Unrealized Losses, fixed maturities, available-for-sale	(1,545)		(1,424)
Debt Securities, Available-for-Sale, Total	45,824		46,041
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	4,794		4,628
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	19		51
Gross Unrealized Losses, fixed maturities, available-for-sale	(30)		(16)
Debt Securities, Available-for-Sale, Total	4,783		4,663
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,360		3,310
Allowance for credit losses, fixed maturity, AFS	(2)	(2)	(2)
Gross Unrealized Gains, fixed maturities, available-for-sale	5		9
Gross Unrealized Losses, fixed maturities, available-for-sale	(3)		(1)
Debt Securities, Available-for-Sale, Total	3,360		3,316
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,956		2,468
Allowance for credit losses, fixed maturity, AFS	(14)	$ (14)	(14)	(14)	$ (14)	(13)
Gross Unrealized Gains, fixed maturities, available-for-sale	21		24
Gross Unrealized Losses, fixed maturities, available-for-sale	(141)		(150)
Debt Securities, Available-for-Sale, Total	1,822		2,328
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	24,401		23,305
Allowance for credit losses, fixed maturity, AFS	0		0	$ 0		$ (3)
Gross Unrealized Gains, fixed maturities, available-for-sale	200		375
Gross Unrealized Losses, fixed maturities, available-for-sale	(733)		(604)
Debt Securities, Available-for-Sale, Total	23,868		23,076
Foreign Govt./Govt. Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	453		440
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	6		9
Gross Unrealized Losses, fixed maturities, available-for-sale	(5)		(2)
Debt Securities, Available-for-Sale, Total	454		447
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	4,253		4,831
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	75		89
Gross Unrealized Losses, fixed maturities, available-for-sale	(223)		(268)
Debt Securities, Available-for-Sale, Total	4,105		4,652
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	6,028		6,372
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	22		50
Gross Unrealized Losses, fixed maturities, available-for-sale	(263)		(244)
Debt Securities, Available-for-Sale, Total	5,787		6,178
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,791		1,517
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	1		3
Gross Unrealized Losses, fixed maturities, available-for-sale	(147)		(139)
Debt Securities, Available-for-Sale, Total	$ 1,645		$ 1,381