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Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities Available-For-Sale) (Details)
$ in Millions
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Estimated Fair Value $ 38,156 $ 59,813
Less than 12 months Gross Unrealized Loss $ 2,705 $ 4,274
Total number of securities in an unrealized loss position less than 12 months 4,605 7,220
Equal to or Greater than 12 Months Estimated Fair Value $ 112,556 $ 119,976
Equal to or Greater than 12 Months Gross Unrealized Loss $ 24,503 $ 26,877
Total number of securities in an unrealized loss position equal or greater than 12 months 9,486 10,468
U.S. corporate    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Estimated Fair Value $ 8,033 $ 17,222
Less than 12 months Gross Unrealized Loss 946 1,586
Equal to or Greater than 12 Months Estimated Fair Value 35,528 35,940
Equal to or Greater than 12 Months Gross Unrealized Loss 5,461 6,599
Foreign corporate    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Estimated Fair Value 4,974 10,516
Less than 12 months Gross Unrealized Loss 361 709
Equal to or Greater than 12 Months Estimated Fair Value 22,072 24,454
Equal to or Greater than 12 Months Gross Unrealized Loss 4,186 5,625
Foreign government    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Estimated Fair Value 7,582 6,462
Less than 12 months Gross Unrealized Loss 533 581
Equal to or Greater than 12 Months Estimated Fair Value 15,953 16,338
Equal to or Greater than 12 Months Gross Unrealized Loss 6,145 4,740
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Estimated Fair Value 5,565 10,152
Less than 12 months Gross Unrealized Loss 179 358
Equal to or Greater than 12 Months Estimated Fair Value 12,759 13,922
Equal to or Greater than 12 Months Gross Unrealized Loss 1,965 2,619
U.S. government and agency    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Estimated Fair Value 5,641 9,337
Less than 12 months Gross Unrealized Loss 395 687
Equal to or Greater than 12 Months Estimated Fair Value 14,136 14,082
Equal to or Greater than 12 Months Gross Unrealized Loss 4,901 5,027
ABS & CLO    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Estimated Fair Value 3,770 2,840
Less than 12 months Gross Unrealized Loss 59 88
Equal to or Greater than 12 Months Estimated Fair Value 3,743 5,831
Equal to or Greater than 12 Months Gross Unrealized Loss 304 436
Municipals    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Estimated Fair Value 1,527 2,012
Less than 12 months Gross Unrealized Loss 184 226
Equal to or Greater than 12 Months Estimated Fair Value 4,602 4,621
Equal to or Greater than 12 Months Gross Unrealized Loss 1,175 1,272
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Estimated Fair Value 1,064 1,272
Less than 12 months Gross Unrealized Loss 48 39
Equal to or Greater than 12 Months Estimated Fair Value 3,763 4,788
Equal to or Greater than 12 Months Gross Unrealized Loss 366 559
Investment Grade    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Estimated Fair Value 36,490 56,946
Less than 12 months Gross Unrealized Loss 2,639 4,132
Equal to or Greater than 12 Months Estimated Fair Value 109,448 116,072
Equal to or Greater than 12 Months Gross Unrealized Loss 24,182 26,325
Below Investment Grade    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months Estimated Fair Value 1,666 2,867
Less than 12 months Gross Unrealized Loss 66 142
Equal to or Greater than 12 Months Estimated Fair Value 3,108 3,904
Equal to or Greater than 12 Months Gross Unrealized Loss $ 321 $ 552