Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities by Sector) (Details) $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	$ 20,825	$ 7,973
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	$ 1,460	$ 585
Fixed maturity securities in continuous unrealized loss position, less than 12 months, number of securities	3,356	1,339
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	$ 36,595	$ 51,190
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	$ 6,388	$ 6,462
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, number of securities	5,195	6,958
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	$ 10,758	$ 4,549
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	719	409
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	17,329	22,435
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	3,146	2,923
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	3,269	1,010
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	351	74
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	5,502	8,229
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	1,117	1,202
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	1,227	413
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	82	21
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	4,624	5,749
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	785	784
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	2,384	445
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	116	8
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	1,858	3,453
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	575	509
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	1,326	411
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	90	33
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	4,338	5,713
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	325	568
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	717	572
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	10	3
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	1,076	3,355
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	65	128
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	871	460
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	63	31
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	1,435	1,636
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	304	267
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value	273	113
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses	29	6
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value	433	620
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses	$ 71	$ 81