Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities Available-For-Sale) (Details) $ in Millions	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	$ 60,415	$ 165,460
Less than 12 months Gross Unrealized Loss	$ 4,232	$ 23,406
Total number of securities in an unrealized loss position less than 12 months	6,726	15,204
Equal to or Greater than 12 Months Estimated Fair Value	$ 146,075	$ 41,420
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 34,416	$ 10,889
Total number of securities in an unrealized loss position equal or greater than 12 months	13,507	4,303
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	$ 16,557	$ 55,210
Less than 12 months Gross Unrealized Loss	1,087	7,573
Equal to or Greater than 12 Months Estimated Fair Value	43,815	6,484
Equal to or Greater than 12 Months Gross Unrealized Loss	9,865	1,965
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	8,019	31,932
Less than 12 months Gross Unrealized Loss	460	5,999
Equal to or Greater than 12 Months Estimated Fair Value	30,876	8,956
Equal to or Greater than 12 Months Gross Unrealized Loss	7,861	2,332
Foreign government
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	5,936	16,568
Less than 12 months Gross Unrealized Loss	353	2,170
Equal to or Greater than 12 Months Estimated Fair Value	19,017	8,308
Equal to or Greater than 12 Months Gross Unrealized Loss	4,869	2,874
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	15,586	20,436
Less than 12 months Gross Unrealized Loss	1,690	2,784
Equal to or Greater than 12 Months Estimated Fair Value	12,076	4,177
Equal to or Greater than 12 Months Gross Unrealized Loss	4,405	1,076
RMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	7,147	16,223
Less than 12 months Gross Unrealized Loss	285	1,890
Equal to or Greater than 12 Months Estimated Fair Value	16,586	6,650
Equal to or Greater than 12 Months Gross Unrealized Loss	3,759	1,628
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	2,628	10,924
Less than 12 months Gross Unrealized Loss	73	712
Equal to or Greater than 12 Months Estimated Fair Value	11,852	4,326
Equal to or Greater than 12 Months Gross Unrealized Loss	826	480
Municipals
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	2,537	7,277
Less than 12 months Gross Unrealized Loss	161	1,514
Equal to or Greater than 12 Months Estimated Fair Value	5,123	482
Equal to or Greater than 12 Months Gross Unrealized Loss	1,713	199
CMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	2,005	6,890
Less than 12 months Gross Unrealized Loss	123	764
Equal to or Greater than 12 Months Estimated Fair Value	6,730	2,037
Equal to or Greater than 12 Months Gross Unrealized Loss	1,118	335
Investment Grade
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	57,520	157,654
Less than 12 months Gross Unrealized Loss	4,115	22,713
Equal to or Greater than 12 Months Estimated Fair Value	139,793	38,785
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 33,441	10,298
Total number of securities in an unrealized loss position equal or greater than 12 months	12,591
Below Investment Grade
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	$ 2,895	7,806
Less than 12 months Gross Unrealized Loss	117	693
Equal to or Greater than 12 Months Estimated Fair Value	6,282	2,635
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 975	$ 591
Total number of securities in an unrealized loss position equal or greater than 12 months	916