Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 40,018	$ 39,533
Allowance for credit losses, fixed maturity, AFS	(17)	(12)	$ (13)	$ (1)
Gross Unrealized Gains, fixed maturities, available-for-sale	224	152
Gross Unrealized Losses, fixed maturities, available-for-sale	(2,781)	(3,442)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	37,444	36,231
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	2,233	2,016
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	(57)	(75)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	2,181	1,941
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,089	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	(79)	(102)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,013	2,941
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,661	3,715
Allowance for credit losses, fixed maturity, AFS	(11)	(10)	(1)	0
Gross Unrealized Gains, fixed maturities, available-for-sale	20	21
Gross Unrealized Losses, fixed maturities, available-for-sale	(341)	(358)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,329	3,368
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	17,424	16,794
Allowance for credit losses, fixed maturity, AFS	(6)	(2)	(9)	(1)
Gross Unrealized Gains, fixed maturities, available-for-sale	69	33
Gross Unrealized Losses, fixed maturities, available-for-sale	(1,277)	(1,592)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	16,210	15,233
Foreign Govt./Govt. Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	588	596
Allowance for credit losses, fixed maturity, AFS	0	0	$ (3)	$ 0
Gross Unrealized Gains, fixed maturities, available-for-sale	1	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)	549	547
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	6,616	6,718
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	119	93
Gross Unrealized Losses, fixed maturities, available-for-sale	(370)	(515)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	6,365	6,296
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	4,169	4,214
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	5	2
Gross Unrealized Losses, fixed maturities, available-for-sale	(437)	(508)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,737	3,708
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	2,238	2,440
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	2	0
Gross Unrealized Losses, fixed maturities, available-for-sale	(180)	(243)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	$ 2,060	$ 2,197

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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