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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 40,580	$ 40,788
Allowance for credit losses, fixed maturity, AFS	(13)	(1)	$ (19)	$ (23)
Gross Unrealized Gains, fixed maturities, available-for-sale	708	2,204
Gross Unrealized Losses, fixed maturities, available-for-sale	(1,042)	(144)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	40,233	42,847
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	960	1,125
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	4	13
Gross Unrealized Losses, fixed maturities, available-for-sale	(22)	(3)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	942	1,135
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	2,987	3,019
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	7	8
Gross Unrealized Losses, fixed maturities, available-for-sale	(23)	(2)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	2,971	3,025
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,773	3,955
Allowance for credit losses, fixed maturity, AFS	(1)	0
Gross Unrealized Gains, fixed maturities, available-for-sale	42	179
Gross Unrealized Losses, fixed maturities, available-for-sale	(92)	(15)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,722	4,119
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	17,831	17,744
Allowance for credit losses, fixed maturity, AFS	(9)	(1)	$ (19)	$ (23)
Gross Unrealized Gains, fixed maturities, available-for-sale	294	1,038
Gross Unrealized Losses, fixed maturities, available-for-sale	(498)	(74)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	17,618	18,707
Foreign Govt./Govt. Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	799	883
Allowance for credit losses, fixed maturity, AFS	(3)	0
Gross Unrealized Gains, fixed maturities, available-for-sale	11	33
Gross Unrealized Losses, fixed maturities, available-for-sale	(23)	(6)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	784	910
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	7,437	7,473
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	300	787
Gross Unrealized Losses, fixed maturities, available-for-sale	(143)	(3)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	7,594	8,257
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	4,085	3,610
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	10	60
Gross Unrealized Losses, fixed maturities, available-for-sale	(159)	(27)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,936	3,643
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	2,708	2,979
Allowance for credit losses, fixed maturity, AFS	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	40	86
Gross Unrealized Losses, fixed maturities, available-for-sale	(82)	(14)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	$ 2,666	$ 3,051

X

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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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