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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 43,035		$ 41,726
Allowance for credit losses, fixed maturity, AFS	(19)	$ (18)	(21)	$ (18)	$ (17)	$ (12)
Gross Unrealized Gains, fixed maturities, available-for-sale	239		418
Gross Unrealized Losses, fixed maturities, available-for-sale	(2,441)		(2,305)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	40,814		39,818
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,041		3,347
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	11		18
Gross Unrealized Losses, fixed maturities, available-for-sale	(38)		(45)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,014		3,320
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,507		3,104
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	8		3
Gross Unrealized Losses, fixed maturities, available-for-sale	(1)		(17)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,514		3,090
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,234		3,466
Allowance for credit losses, fixed maturity, AFS	(13)	(12)	(12)	(12)	(11)	(10)
Gross Unrealized Gains, fixed maturities, available-for-sale	22		19
Gross Unrealized Losses, fixed maturities, available-for-sale	(301)		(348)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	2,942		3,125
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	20,548		18,691
Allowance for credit losses, fixed maturity, AFS	(6)	$ (6)	(9)	$ (6)	$ (6)	$ (2)
Gross Unrealized Gains, fixed maturities, available-for-sale	101		197
Gross Unrealized Losses, fixed maturities, available-for-sale	(1,150)		(1,013)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	19,493		17,866
Foreign Govt./Govt. Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	569		583
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	3		6
Gross Unrealized Losses, fixed maturities, available-for-sale	(26)		(27)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	546		562
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	5,555		6,207
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	80		131
Gross Unrealized Losses, fixed maturities, available-for-sale	(341)		(299)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	5,294		6,039
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	5,204		4,675
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	10		18
Gross Unrealized Losses, fixed maturities, available-for-sale	(427)		(406)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	4,787		4,287
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,377		1,653
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	4		26
Gross Unrealized Losses, fixed maturities, available-for-sale	(157)		(150)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	$ 1,224		$ 1,529

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