Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities Available-For-Sale) (Details) $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	$ 26,345	$ 165,460
Less than 12 months, Gross Unrealized Loss	$ 1,382	$ 23,406
Total number of securities in an unrealized loss position less than 12 months	2,922	15,204
Equal to or Greater than 12 Months, Estimated Fair Value	$ 152,089	$ 41,420
Equal to or Greater than 12 Months ,Gross Unrealized Loss	$ 24,394	$ 10,889
Total number of securities in an unrealized loss position equal or greater than 12 months	13,049	4,303
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	$ 4,722	$ 55,210
Less than 12 months, Gross Unrealized Loss	420	7,573
Equal to or Greater than 12 Months, Estimated Fair Value	45,373	6,484
Equal to or Greater than 12 Months ,Gross Unrealized Loss	6,208	1,965
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	3,210	31,932
Less than 12 months, Gross Unrealized Loss	187	5,999
Equal to or Greater than 12 Months, Estimated Fair Value	32,355	8,956
Equal to or Greater than 12 Months ,Gross Unrealized Loss	5,240	2,332
Foreign government
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	3,913	16,568
Less than 12 months, Gross Unrealized Loss	246	2,170
Equal to or Greater than 12 Months, Estimated Fair Value	19,715	8,308
Equal to or Greater than 12 Months ,Gross Unrealized Loss	4,187	2,874
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	7,856	20,436
Less than 12 months, Gross Unrealized Loss	368	2,784
Equal to or Greater than 12 Months, Estimated Fair Value	13,960	4,177
Equal to or Greater than 12 Months ,Gross Unrealized Loss	3,344	1,076
RMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	3,465	16,223
Less than 12 months, Gross Unrealized Loss	60	1,890
Equal to or Greater than 12 Months, Estimated Fair Value	17,128	6,650
Equal to or Greater than 12 Months ,Gross Unrealized Loss	2,675	1,628
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	1,662	10,924
Less than 12 months, Gross Unrealized Loss	31	712
Equal to or Greater than 12 Months, Estimated Fair Value	11,438	4,326
Equal to or Greater than 12 Months ,Gross Unrealized Loss	629	480
Municipals
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	483	7,277
Less than 12 months, Gross Unrealized Loss	34	1,514
Equal to or Greater than 12 Months, Estimated Fair Value	5,449	482
Equal to or Greater than 12 Months ,Gross Unrealized Loss	1,194	199
CMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	1,034	6,890
Less than 12 months, Gross Unrealized Loss	36	764
Equal to or Greater than 12 Months, Estimated Fair Value	6,671	2,037
Equal to or Greater than 12 Months ,Gross Unrealized Loss	917	335
Investment Grade
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	24,834	157,654
Less than 12 months, Gross Unrealized Loss	1,287	22,713
Equal to or Greater than 12 Months, Estimated Fair Value	146,138	38,785
Equal to or Greater than 12 Months ,Gross Unrealized Loss	23,675	10,298
Below Investment Grade
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Estimated Fair Value	1,511	7,806
Less than 12 months, Gross Unrealized Loss	95	693
Equal to or Greater than 12 Months, Estimated Fair Value	5,951	2,635
Equal to or Greater than 12 Months ,Gross Unrealized Loss	$ 719	$ 591