v3.26.1
Investments - Schedule of Gross Unrealized Losses and Fair Value of Investment Securities (Details)
$ in Millions
Jun. 30, 2026
USD ($)
security
Dec. 31, 2025
USD ($)
security
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 7,635 $ 2,786
Less than 12 months, gross unrealized losses $ (134) $ (82)
Less than 12 months, number of securities in a continuous loss position | security 1,584 610
12 months or more, fair value $ 21,749 $ 23,303
12 months or more, gross unrealized losses $ (3,370) $ (3,145)
12 months or more, number of securities in a continuous loss position | security 2,883 3,069
Fair value $ 29,384 $ 26,089
Gross unrealized losses $ (3,504) $ (3,227)
Number of securities | security 4,467 3,679
Investment grade    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 7,394 $ 2,705
Less than 12 months, gross unrealized losses $ (124) $ (71)
Less than 12 months, number of securities in a continuous loss position | security 1,526 582
12 months or more, fair value $ 21,243 $ 22,737
12 months or more, gross unrealized losses $ (3,315) $ (3,096)
12 months or more, number of securities in a continuous loss position | security 2,801 2,991
Fair value $ 28,637 $ 25,442
Gross unrealized losses $ (3,439) $ (3,167)
Number of securities | security 4,327 3,573
Below investment grade    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 241 $ 81
Less than 12 months, gross unrealized losses $ (10) $ (11)
Less than 12 months, number of securities in a continuous loss position | security 58 28
12 months or more, fair value $ 506 $ 566
12 months or more, gross unrealized losses $ (55) $ (49)
12 months or more, number of securities in a continuous loss position | security 82 78
Fair value $ 747 $ 647
Gross unrealized losses $ (65) $ (60)
Number of securities | security 140 106
Less Than 20% Below cost    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 7,615 $ 2,731
Less than 12 months, gross unrealized losses $ (124) $ (61)
Less than 12 months, number of securities in a continuous loss position | security 1,577 593
12 months or more, fair value $ 17,725 $ 19,932
12 months or more, gross unrealized losses $ (1,927) $ (1,928)
12 months or more, number of securities in a continuous loss position | security 2,343 2,587
Fair value $ 25,340 $ 22,663
Gross unrealized losses $ (2,051) $ (1,989)
Number of securities | security 3,920 3,180
20%-50% Below cost    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 20 $ 55
Less than 12 months, gross unrealized losses $ (10) $ (21)
Less than 12 months, number of securities in a continuous loss position | security 7 17
12 months or more, fair value $ 4,023 $ 3,370
12 months or more, gross unrealized losses $ (1,442) $ (1,216)
12 months or more, number of securities in a continuous loss position | security 539 481
Fair value $ 4,043 $ 3,425
Gross unrealized losses $ (1,452) $ (1,237)
Number of securities | security 546 498
>50% Below cost    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 0 $ 0
Less than 12 months, gross unrealized losses $ 0 $ 0
Less than 12 months, number of securities in a continuous loss position | security 0 0
12 months or more, fair value $ 1 $ 1
12 months or more, gross unrealized losses $ (1) $ (1)
12 months or more, number of securities in a continuous loss position | security 1 1
Fair value $ 1 $ 1
Gross unrealized losses $ (1) $ (1)
Number of securities | security 1 1
U.S. government, agencies and government-sponsored enterprises    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 498 $ 438
Less than 12 months, gross unrealized losses $ (12) $ (9)
Less than 12 months, number of securities in a continuous loss position | security 57 28
12 months or more, fair value $ 1,679 $ 1,626
12 months or more, gross unrealized losses $ (404) $ (355)
12 months or more, number of securities in a continuous loss position | security 59 68
Fair value $ 2,177 $ 2,064
Gross unrealized losses $ (416) $ (364)
Number of securities | security 116 96
State and political subdivisions    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 209 $ 79
Less than 12 months, gross unrealized losses $ (9) $ (2)
Less than 12 months, number of securities in a continuous loss position | security 32 18
12 months or more, fair value $ 1,456 $ 1,577
12 months or more, gross unrealized losses $ (260) $ (253)
12 months or more, number of securities in a continuous loss position | security 249 257
Fair value $ 1,665 $ 1,656
Gross unrealized losses $ (269) $ (255)
Number of securities | security 281 275
Non-U.S. government    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 383 $ 115
Less than 12 months, gross unrealized losses $ (6) $ (1)
Less than 12 months, number of securities in a continuous loss position | security 113 36
12 months or more, fair value $ 336 $ 399
12 months or more, gross unrealized losses $ (73) $ (74)
12 months or more, number of securities in a continuous loss position | security 51 55
Fair value $ 719 $ 514
Gross unrealized losses $ (79) $ (75)
Number of securities | security 164 91
U.S. corporate    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 4,148 $ 1,664
Less than 12 months, gross unrealized losses $ (79) $ (57)
Less than 12 months, number of securities in a continuous loss position | security 883 399
12 months or more, fair value $ 13,224 $ 14,057
12 months or more, gross unrealized losses $ (1,954) $ (1,811)
12 months or more, number of securities in a continuous loss position | security 1,757 1,814
Fair value $ 17,372 $ 15,721
Gross unrealized losses $ (2,033) $ (1,868)
Number of securities | security 2,640 2,213
Non-U.S. corporate    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 1,370 $ 244
Less than 12 months, gross unrealized losses $ (16) $ (11)
Less than 12 months, number of securities in a continuous loss position | security 231 57
12 months or more, fair value $ 3,160 $ 3,495
12 months or more, gross unrealized losses $ (377) $ (366)
12 months or more, number of securities in a continuous loss position | security 393 438
Fair value $ 4,530 $ 3,739
Gross unrealized losses $ (393) $ (377)
Number of securities | security 624 495
Residential mortgage-backed    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 240 $ 0
Less than 12 months, gross unrealized losses $ (2) $ 0
Less than 12 months, number of securities in a continuous loss position | security 104 0
12 months or more, fair value $ 341 $ 391
12 months or more, gross unrealized losses $ (36) $ (34)
12 months or more, number of securities in a continuous loss position | security 122 140
Fair value $ 581 $ 391
Gross unrealized losses $ (38) $ (34)
Number of securities | security 226 140
Commercial mortgage-backed    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 162 $ 59
Less than 12 months, gross unrealized losses $ (4) $ (1)
Less than 12 months, number of securities in a continuous loss position | security 35 15
12 months or more, fair value $ 1,070 $ 1,118
12 months or more, gross unrealized losses $ (239) $ (225)
12 months or more, number of securities in a continuous loss position | security 159 169
Fair value $ 1,232 $ 1,177
Gross unrealized losses $ (243) $ (226)
Number of securities | security 194 184
Other asset-backed    
Schedule of Investments [Line Items]    
Less than 12 months, fair value $ 625 $ 187
Less than 12 months, gross unrealized losses $ (6) $ (1)
Less than 12 months, number of securities in a continuous loss position | security 129 57
12 months or more, fair value $ 483 $ 640
12 months or more, gross unrealized losses $ (27) $ (27)
12 months or more, number of securities in a continuous loss position | security 93 128
Fair value $ 1,108 $ 827
Gross unrealized losses $ (33) $ (28)
Number of securities | security 222 185