v3.26.1
Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Debt Securities [Line Items]    
Less than Twelve Months, Fair Value $ 82,192 $ 33,698
Less than Twelve Months, Unrealized Losses 1,603 976
Twelve Months or More, Fair Value 135,572 147,942
Twelve Months or More, Unrealized Losses 34,334 32,225
Fair Value 217,764 181,640
Gross Unrealized Losses 35,937 33,201
U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Debt Securities [Line Items]    
Less than Twelve Months, Fair Value 7,060 3,644
Less than Twelve Months, Unrealized Losses 174 83
Twelve Months or More, Fair Value 10,859 12,075
Twelve Months or More, Unrealized Losses 4,578 4,740
Fair Value 17,919 15,719
Gross Unrealized Losses 4,752 4,823
Obligations of U.S. states and their political subdivisions    
Debt Securities [Line Items]    
Less than Twelve Months, Fair Value 563 399
Less than Twelve Months, Unrealized Losses 11 9
Twelve Months or More, Fair Value 3,248 3,631
Twelve Months or More, Unrealized Losses 503 545
Fair Value 3,811 4,030
Gross Unrealized Losses 514 554
Foreign government securities    
Debt Securities [Line Items]    
Less than Twelve Months, Fair Value 12,682 9,886
Less than Twelve Months, Unrealized Losses 392 510
Twelve Months or More, Fair Value 23,453 23,570
Twelve Months or More, Unrealized Losses 13,522 11,842
Fair Value 36,135 33,456
Gross Unrealized Losses 13,914 12,352
U.S. public corporate securities    
Debt Securities [Line Items]    
Less than Twelve Months, Fair Value 27,605 9,789
Less than Twelve Months, Unrealized Losses 494 218
Twelve Months or More, Fair Value 47,707 52,459
Twelve Months or More, Unrealized Losses 9,315 9,114
Fair Value 75,312 62,248
Gross Unrealized Losses 9,809 9,332
U.S. private corporate securities    
Debt Securities [Line Items]    
Less than Twelve Months, Fair Value 8,086 3,297
Less than Twelve Months, Unrealized Losses 157 68
Twelve Months or More, Fair Value 21,759 24,064
Twelve Months or More, Unrealized Losses 2,078 1,895
Fair Value 29,845 27,361
Gross Unrealized Losses 2,235 1,963
Foreign public corporate securities    
Debt Securities [Line Items]    
Less than Twelve Months, Fair Value 6,066 2,253
Less than Twelve Months, Unrealized Losses 93 35
Twelve Months or More, Fair Value 8,038 8,586
Twelve Months or More, Unrealized Losses 1,212 1,142
Fair Value 14,104 10,839
Gross Unrealized Losses 1,305 1,177
Foreign private corporate securities    
Debt Securities [Line Items]    
Less than Twelve Months, Fair Value 6,937 849
Less than Twelve Months, Unrealized Losses 199 44
Twelve Months or More, Fair Value 14,406 16,286
Twelve Months or More, Unrealized Losses 2,632 2,473
Fair Value 21,343 17,135
Gross Unrealized Losses 2,831 2,517
Asset-backed securities    
Debt Securities [Line Items]    
Less than Twelve Months, Fair Value 6,809 2,979
Less than Twelve Months, Unrealized Losses 35 6
Twelve Months or More, Fair Value 687 626
Twelve Months or More, Unrealized Losses 34 20
Fair Value 7,496 3,605
Gross Unrealized Losses 69 26
Commercial mortgage-backed securities    
Debt Securities [Line Items]    
Less than Twelve Months, Fair Value 1,669 249
Less than Twelve Months, Unrealized Losses 13 1
Twelve Months or More, Fair Value 4,264 5,435
Twelve Months or More, Unrealized Losses 293 301
Fair Value 5,933 5,684
Gross Unrealized Losses 306 302
Residential mortgage-backed securities    
Debt Securities [Line Items]    
Less than Twelve Months, Fair Value 4,715 353
Less than Twelve Months, Unrealized Losses 35 2
Twelve Months or More, Fair Value 1,151 1,210
Twelve Months or More, Unrealized Losses 167 153
Fair Value 5,866 1,563
Gross Unrealized Losses $ 202 $ 155