Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities Available-For-Sale) (Details) $ in Millions	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	$ 40,101	$ 26,345
Less than 12 months Gross Unrealized Loss	$ 2,238	$ 1,382
Total number of securities in an unrealized loss position less than 12 months	5,529	2,922
Equal to or Greater than 12 Months Estimated Fair Value	$ 142,618	$ 152,089
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 28,152	$ 24,394
Total number of securities in an unrealized loss position equal or greater than 12 months	12,516	13,049
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	$ 9,292	$ 4,722
Less than 12 months Gross Unrealized Loss	745	420
Equal to or Greater than 12 Months Estimated Fair Value	43,435	45,373
Equal to or Greater than 12 Months Gross Unrealized Loss	7,432	6,208
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	6,069	3,210
Less than 12 months Gross Unrealized Loss	226	187
Equal to or Greater than 12 Months Estimated Fair Value	29,622	32,355
Equal to or Greater than 12 Months Gross Unrealized Loss	5,897	5,240
Foreign government
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	5,939	3,913
Less than 12 months Gross Unrealized Loss	599	246
Equal to or Greater than 12 Months Estimated Fair Value	17,192	19,715
Equal to or Greater than 12 Months Gross Unrealized Loss	4,795	4,187
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	9,778	7,856
Less than 12 months Gross Unrealized Loss	439	368
Equal to or Greater than 12 Months Estimated Fair Value	16,053	13,960
Equal to or Greater than 12 Months Gross Unrealized Loss	4,552	3,344
RMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	5,169	3,465
Less than 12 months Gross Unrealized Loss	106	60
Equal to or Greater than 12 Months Estimated Fair Value	17,954	17,128
Equal to or Greater than 12 Months Gross Unrealized Loss	2,947	2,675
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	1,501	1,662
Less than 12 months Gross Unrealized Loss	9	31
Equal to or Greater than 12 Months Estimated Fair Value	7,125	11,438
Equal to or Greater than 12 Months Gross Unrealized Loss	502	629
Municipals
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	1,052	483
Less than 12 months Gross Unrealized Loss	96	34
Equal to or Greater than 12 Months Estimated Fair Value	5,370	5,449
Equal to or Greater than 12 Months Gross Unrealized Loss	1,305	1,194
CMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	1,301	1,034
Less than 12 months Gross Unrealized Loss	18	36
Equal to or Greater than 12 Months Estimated Fair Value	5,867	6,671
Equal to or Greater than 12 Months Gross Unrealized Loss	722	917
Investment Grade
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	37,786	24,834
Less than 12 months Gross Unrealized Loss	2,114	1,287
Equal to or Greater than 12 Months Estimated Fair Value	137,638	146,138
Equal to or Greater than 12 Months Gross Unrealized Loss	27,415	23,675
Below Investment Grade
Debt Securities, Available-for-sale [Line Items]
Less than 12 months Estimated Fair Value	2,315	1,511
Less than 12 months Gross Unrealized Loss	124	95
Equal to or Greater than 12 Months Estimated Fair Value	4,980	5,951
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 737	$ 719