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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 41,220		$ 41,561
Allowance for credit losses, fixed maturity, AFS	(4)	$ (19)	(23)	$ (32)	$ (12)	$ 0
Gross Unrealized Gains, fixed maturities, available-for-sale	2,864		3,560
Gross Unrealized Losses, fixed maturities, available-for-sale	(57)		(63)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	44,023		45,035
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	1,295		1,525
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	26		39
Gross Unrealized Losses, fixed maturities, available-for-sale	0		0
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	1,321		1,564
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,092		2,780
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	9		7
Gross Unrealized Losses, fixed maturities, available-for-sale	(1)		(7)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,100		2,780
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,853		4,219
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	250		286
Gross Unrealized Losses, fixed maturities, available-for-sale	(8)		(21)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	4,095		4,484
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	17,740		18,401
Allowance for credit losses, fixed maturity, AFS	(4)	$ (19)	(23)	$ (32)	$ (12)	$ 0
Gross Unrealized Gains, fixed maturities, available-for-sale	1,457		1,926
Gross Unrealized Losses, fixed maturities, available-for-sale	(32)		(31)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	19,161		20,273
Foreign Govt./Govt. Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	824		842
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	52		77
Gross Unrealized Losses, fixed maturities, available-for-sale	(3)		0
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	873		919
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	8,281		8,564
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	882		940
Gross Unrealized Losses, fixed maturities, available-for-sale	(2)		(1)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	9,161		9,503
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,436		3,966
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	92		144
Gross Unrealized Losses, fixed maturities, available-for-sale	(8)		(3)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,520		4,107
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	2,699		1,264
Allowance for credit losses, fixed maturity, AFS	0		0
Gross Unrealized Gains, fixed maturities, available-for-sale	96		141
Gross Unrealized Losses, fixed maturities, available-for-sale	(3)		0
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	$ 2,792		$ 1,405

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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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