Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities Available-For-Sale) (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	$ 31,686	$ 26,345
Less than 12 months Gross Unrealized Loss	$ 1,899	$ 1,382
Total number of securities in an unrealized loss position less than 12 months	3,607	2,922
Equal to or Greater than 12 Months Estimated Fair Value	$ 145,358	$ 152,089
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 26,175	$ 24,394
Total number of securities in an unrealized loss position equal or greater than 12 months	12,802	13,049
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	$ 7,027	$ 4,722
Less than 12 months Gross Unrealized Loss	610	420
Equal to or Greater than 12 Months Estimated Fair Value	44,051	45,373
Equal to or Greater than 12 Months Gross Unrealized Loss	6,807	6,208
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	3,456	3,210
Less than 12 months Gross Unrealized Loss	153	187
Equal to or Greater than 12 Months Estimated Fair Value	30,912	32,355
Equal to or Greater than 12 Months Gross Unrealized Loss	5,666	5,240
Foreign government
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	4,967	3,913
Less than 12 months Gross Unrealized Loss	419	246
Equal to or Greater than 12 Months Estimated Fair Value	18,275	19,715
Equal to or Greater than 12 Months Gross Unrealized Loss	4,352	4,187
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	8,965	7,856
Less than 12 months Gross Unrealized Loss	499	368
Equal to or Greater than 12 Months Estimated Fair Value	14,810	13,960
Equal to or Greater than 12 Months Gross Unrealized Loss	3,991	3,344
RMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	4,303	3,465
Less than 12 months Gross Unrealized Loss	99	60
Equal to or Greater than 12 Months Estimated Fair Value	17,123	17,128
Equal to or Greater than 12 Months Gross Unrealized Loss	2,872	2,675
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	1,807	1,662
Less than 12 months Gross Unrealized Loss	30	31
Equal to or Greater than 12 Months Estimated Fair Value	8,645	11,438
Equal to or Greater than 12 Months Gross Unrealized Loss	538	629
Municipals
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	709	483
Less than 12 months Gross Unrealized Loss	76	34
Equal to or Greater than 12 Months Estimated Fair Value	5,338	5,449
Equal to or Greater than 12 Months Gross Unrealized Loss	1,208	1,194
CMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	452	1,034
Less than 12 months Gross Unrealized Loss	13	36
Equal to or Greater than 12 Months Estimated Fair Value	6,204	6,671
Equal to or Greater than 12 Months Gross Unrealized Loss	741	917
Investment Grade
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	30,014	24,834
Less than 12 months Gross Unrealized Loss	1,805	1,287
Equal to or Greater than 12 Months Estimated Fair Value	139,769	146,138
Equal to or Greater than 12 Months Gross Unrealized Loss	25,406	23,675
Below Investment Grade
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	1,672	1,511
Less than 12 months Gross Unrealized Loss	94	95
Equal to or Greater than 12 Months Estimated Fair Value	5,589	5,951
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 769	$ 719