Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 40,411		$ 39,533
Allowance for credit losses, fixed maturity, AFS	(18)	$ (17)	(12)	$ (13)	$ (13)	$ (1)
Gross Unrealized Gains, fixed maturities, available-for-sale	159		152
Gross Unrealized Losses, fixed maturities, available-for-sale	(3,055)		(3,442)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	37,497		36,231
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	2,757		2,016
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	1		0
Gross Unrealized Losses, fixed maturities, available-for-sale	(73)		(75)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	2,685		1,941
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,046		3,040
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	3		3
Gross Unrealized Losses, fixed maturities, available-for-sale	(68)		(102)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	2,981		2,941
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,607		3,715
Allowance for credit losses, fixed maturity, AFS	(12)	(11)	(10)	(1)	(1)	0
Gross Unrealized Gains, fixed maturities, available-for-sale	19		21
Gross Unrealized Losses, fixed maturities, available-for-sale	(387)		(358)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,227		3,368
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	17,467		16,794
Allowance for credit losses, fixed maturity, AFS	(6)	$ (6)	(2)	(8)	(9)	(1)
Gross Unrealized Gains, fixed maturities, available-for-sale	39		33
Gross Unrealized Losses, fixed maturities, available-for-sale	(1,404)		(1,592)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	16,096		15,233
Foreign Govt./Govt. Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	579		596
Allowance for credit losses, fixed maturity, AFS	0		0	$ (4)	$ (3)	$ 0
Gross Unrealized Gains, fixed maturities, available-for-sale	0		0
Gross Unrealized Losses, fixed maturities, available-for-sale	(40)		(49)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	539		547
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	6,523		6,718
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	96		93
Gross Unrealized Losses, fixed maturities, available-for-sale	(393)		(515)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	6,226		6,296
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	4,202		4,214
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	1		2
Gross Unrealized Losses, fixed maturities, available-for-sale	(474)		(508)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,729		3,708
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	2,230		2,440
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	0		0
Gross Unrealized Losses, fixed maturities, available-for-sale	(216)		(243)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	$ 2,014		$ 2,197