Investments (Fixed Maturity Securities by Sector) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	$ 82,634	$ 78,287
Fixed maturity securities, allowance for credit losses	3	11
Fixed maturity securities, gross unrealized gains	1,660	8,701
Fixed maturity securities, gross unrealized losses	6,579	450
Fixed maturity securities, estimated fair value	77,712	86,527
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	35,825	34,773
Fixed maturity securities, allowance for credit losses	1	2
Fixed maturity securities, gross unrealized gains	419	3,890
Fixed maturity securities, gross unrealized losses	3,269	187
Fixed maturity securities, estimated fair value	32,974	38,474
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	11,819	10,813
Fixed maturity securities, allowance for credit losses	0	7
Fixed maturity securities, gross unrealized gains	66	902
Fixed maturity securities, gross unrealized losses	1,424	103
Fixed maturity securities, estimated fair value	10,461	11,605
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	8,751	8,838
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	95	433
Fixed maturity securities, gross unrealized losses	536	51
Fixed maturity securities, estimated fair value	8,310	9,220
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	9,082	7,188
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	782	2,040
Fixed maturity securities, gross unrealized losses	388	60
Fixed maturity securities, estimated fair value	9,476	9,168
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	7,052	6,890
Fixed maturity securities, allowance for credit losses	2	0
Fixed maturity securities, gross unrealized gains	2	329
Fixed maturity securities, gross unrealized losses	416	24
Fixed maturity securities, estimated fair value	6,636	7,193
State and political subdivision
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	3,978	3,937
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	236	829
Fixed maturity securities, gross unrealized losses	228	6
Fixed maturity securities, estimated fair value	3,986	4,760
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	4,905	4,255
Fixed maturity securities, allowance for credit losses	0	2
Fixed maturity securities, gross unrealized gains	2	34
Fixed maturity securities, gross unrealized losses	228	14
Fixed maturity securities, estimated fair value	4,679	4,275
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	1,222	1,593
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	58	244
Fixed maturity securities, gross unrealized losses	90	5
Fixed maturity securities, estimated fair value	$ 1,190	$ 1,832

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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