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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 43,664		$ 41,726
Allowance for credit losses, fixed maturity, AFS	(16)	$ (19)	(21)	$ (20)	$ (18)	$ (12)
Gross Unrealized Gains, fixed maturities, available-for-sale	694		418
Gross Unrealized Losses, fixed maturities, available-for-sale	(1,549)		(2,305)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	42,793		39,818
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,474		3,347
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	57		18
Gross Unrealized Losses, fixed maturities, available-for-sale	(19)		(45)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,512		3,320
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,553		3,104
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	10		3
Gross Unrealized Losses, fixed maturities, available-for-sale	0		(17)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,563		3,090
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,062		3,466
Allowance for credit losses, fixed maturity, AFS	(13)	(13)	(12)	(12)	(12)	(10)
Gross Unrealized Gains, fixed maturities, available-for-sale	28		19
Gross Unrealized Losses, fixed maturities, available-for-sale	(220)		(348)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	2,857		3,125
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	20,850		18,691
Allowance for credit losses, fixed maturity, AFS	(3)	$ (6)	(9)	$ (8)	$ (6)	$ (2)
Gross Unrealized Gains, fixed maturities, available-for-sale	395		197
Gross Unrealized Losses, fixed maturities, available-for-sale	(684)		(1,013)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	20,558		17,866
Foreign Govt./Govt. Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	543		583
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	11		6
Gross Unrealized Losses, fixed maturities, available-for-sale	(13)		(27)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	541		562
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	5,779		6,207
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	124		131
Gross Unrealized Losses, fixed maturities, available-for-sale	(249)		(299)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	5,654		6,039
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	5,356		4,675
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	49		18
Gross Unrealized Losses, fixed maturities, available-for-sale	(282)		(406)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	5,123		4,287
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,047		1,653
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	20		26
Gross Unrealized Losses, fixed maturities, available-for-sale	(82)		(150)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	$ 985		$ 1,529

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