Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities by Sector) (Details) $ in Millions	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	$ 55,788	$ 16,729
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	$ 5,548	$ 305
Fixed maturity securities in continuous unrealized loss position, less than 12 months, number of securities	7,502	2,423
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	$ 4,032	$ 1,658
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	$ 1,031	$ 145
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, number of securities	775	368
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	$ 24,647	$ 5,051
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	2,776	111
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	1,769	887
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	493	76
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	8,412	2,016
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	1,249	60
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	578	305
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	175	43
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	6,083	3,481
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	465	50
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	488	32
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	71	1
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	4,027	1,712
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	187	40
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	497	222
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	201	20
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	6,009	1,390
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	348	21
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	398	95
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	68	3
State and political subdivision
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	1,773	347
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	221	6
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	19	6
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	7	0
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	4,095	2,454
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	212	13
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	283	93
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	16	1
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	742	278
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	90	4
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	0	18
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	$ 0	$ 1

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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