v3.26.1
Investments - Schedule of Gross Unrealized Losses and Fair Value of Corporate Securities Based on Industries (Details)
$ in Millions
Mar. 31, 2026
USD ($)
security
Dec. 31, 2025
USD ($)
security
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 7,344 $ 2,786
Less than 12 months, Gross unrealized losses $ (155) $ (82)
Less than 12 months, Number of securities in a continuous loss position | security 1,590 610
12 months or more, Fair value $ 22,213 $ 23,303
12 months or more, Gross unrealized losses $ (3,528) $ (3,145)
12 months or more, Number of securities in a continuous loss position | security 3,023 3,069
Fair value $ 29,557 $ 26,089
Gross unrealized losses $ (3,683) $ (3,227)
Number of securities | security 4,613 3,679
Corporate Debt Securities    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 5,354 $ 1,908
Less than 12 months, Gross unrealized losses $ (120) $ (68)
Less than 12 months, Number of securities in a continuous loss position | security 1,150 456
12 months or more, Fair value $ 16,741 $ 17,552
12 months or more, Gross unrealized losses $ (2,493) $ (2,177)
12 months or more, Number of securities in a continuous loss position | security 2,267 2,252
Fair value $ 22,095 $ 19,460
Gross unrealized losses $ (2,613) $ (2,245)
Number of securities | security 3,417 2,708
U.S. corporate    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 4,053 $ 1,664
Less than 12 months, Gross unrealized losses $ (98) $ (57)
Less than 12 months, Number of securities in a continuous loss position | security 905 399
12 months or more, Fair value $ 13,471 $ 14,057
12 months or more, Gross unrealized losses $ (2,085) $ (1,811)
12 months or more, Number of securities in a continuous loss position | security 1,858 1,814
Fair value $ 17,524 $ 15,721
Gross unrealized losses $ (2,183) $ (1,868)
Number of securities | security 2,763 2,213
U.S. corporate | Utilities    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 771 $ 319
Less than 12 months, Gross unrealized losses $ (15) $ (8)
Less than 12 months, Number of securities in a continuous loss position | security 146 66
12 months or more, Fair value $ 2,025 $ 2,109
12 months or more, Gross unrealized losses $ (411) $ (367)
12 months or more, Number of securities in a continuous loss position | security 313 320
Fair value $ 2,796 $ 2,428
Gross unrealized losses $ (426) $ (375)
Number of securities | security 459 386
U.S. corporate | Energy    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 281 $ 147
Less than 12 months, Gross unrealized losses $ (6) $ (5)
Less than 12 months, Number of securities in a continuous loss position | security 77 30
12 months or more, Fair value $ 991 $ 1,009
12 months or more, Gross unrealized losses $ (132) $ (118)
12 months or more, Number of securities in a continuous loss position | security 132 134
Fair value $ 1,272 $ 1,156
Gross unrealized losses $ (138) $ (123)
Number of securities | security 209 164
U.S. corporate | Finance and insurance    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 1,118 $ 329
Less than 12 months, Gross unrealized losses $ (21) $ (5)
Less than 12 months, Number of securities in a continuous loss position | security 253 95
12 months or more, Fair value $ 3,971 $ 4,198
12 months or more, Gross unrealized losses $ (559) $ (482)
12 months or more, Number of securities in a continuous loss position | security 525 514
Fair value $ 5,089 $ 4,527
Gross unrealized losses $ (580) $ (487)
Number of securities | security 778 609
U.S. corporate | Consumer—non-cyclical    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 561 $ 239
Less than 12 months, Gross unrealized losses $ (12) $ (3)
Less than 12 months, Number of securities in a continuous loss position | security 132 60
12 months or more, Fair value $ 2,259 $ 2,368
12 months or more, Gross unrealized losses $ (330) $ (276)
12 months or more, Number of securities in a continuous loss position | security 285 261
Fair value $ 2,820 $ 2,607
Gross unrealized losses $ (342) $ (279)
Number of securities | security 417 321
U.S. corporate | Technology and communications    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 410 $ 259
Less than 12 months, Gross unrealized losses $ (18) $ (16)
Less than 12 months, Number of securities in a continuous loss position | security 98 63
12 months or more, Fair value $ 1,564 $ 1,573
12 months or more, Gross unrealized losses $ (276) $ (240)
12 months or more, Number of securities in a continuous loss position | security 206 195
Fair value $ 1,974 $ 1,832
Gross unrealized losses $ (294) $ (256)
Number of securities | security 304 258
U.S. corporate | Industrial    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 110 $ 56
Less than 12 months, Gross unrealized losses $ (3) $ (1)
Less than 12 months, Number of securities in a continuous loss position | security 30 18
12 months or more, Fair value $ 545 $ 575
12 months or more, Gross unrealized losses $ (91) $ (82)
12 months or more, Number of securities in a continuous loss position | security 83 81
Fair value $ 655 $ 631
Gross unrealized losses $ (94) $ (83)
Number of securities | security 113 99
U.S. corporate | Capital goods    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 397 $ 146
Less than 12 months, Gross unrealized losses $ (8) $ (3)
Less than 12 months, Number of securities in a continuous loss position | security 87 37
12 months or more, Fair value $ 916 $ 983
12 months or more, Gross unrealized losses $ (118) $ (102)
12 months or more, Number of securities in a continuous loss position | security 128 128
Fair value $ 1,313 $ 1,129
Gross unrealized losses $ (126) $ (105)
Number of securities | security 215 165
U.S. corporate | Consumer—cyclical    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 210 $ 0
Less than 12 months, Gross unrealized losses $ (3) $ 0
Less than 12 months, Number of securities in a continuous loss position | security 46 0
12 months or more, Fair value $ 645 $ 715
12 months or more, Gross unrealized losses $ (78) $ (69)
12 months or more, Number of securities in a continuous loss position | security 99 103
Fair value $ 855 $ 715
Gross unrealized losses $ (81) $ (69)
Number of securities | security 145 103
U.S. corporate | Transportation    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 195 $ 130
Less than 12 months, Gross unrealized losses $ (12) $ (10)
Less than 12 months, Number of securities in a continuous loss position | security 36 24
12 months or more, Fair value $ 441 $ 449
12 months or more, Gross unrealized losses $ (75) $ (67)
12 months or more, Number of securities in a continuous loss position | security 71 67
Fair value $ 636 $ 579
Gross unrealized losses $ (87) $ (77)
Number of securities | security 107 91
U.S. corporate | Other    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 0 $ 39
Less than 12 months, Gross unrealized losses $ 0 $ (6)
Less than 12 months, Number of securities in a continuous loss position | security 0 6
12 months or more, Fair value $ 114 $ 78
12 months or more, Gross unrealized losses $ (15) $ (8)
12 months or more, Number of securities in a continuous loss position | security 16 11
Fair value $ 114 $ 117
Gross unrealized losses $ (15) $ (14)
Number of securities | security 16 17
Non-U.S. corporate    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 1,301 $ 244
Less than 12 months, Gross unrealized losses $ (22) $ (11)
Less than 12 months, Number of securities in a continuous loss position | security 245 57
12 months or more, Fair value $ 3,270 $ 3,495
12 months or more, Gross unrealized losses $ (408) $ (366)
12 months or more, Number of securities in a continuous loss position | security 409 438
Fair value $ 4,571 $ 3,739
Gross unrealized losses $ (430) $ (377)
Number of securities | security 654 495
Non-U.S. corporate | Utilities    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 143 $ 0
Less than 12 months, Gross unrealized losses $ (1) $ 0
Less than 12 months, Number of securities in a continuous loss position | security 24 0
12 months or more, Fair value $ 359 $ 386
12 months or more, Gross unrealized losses $ (37) $ (36)
12 months or more, Number of securities in a continuous loss position | security 41 43
Fair value $ 502 $ 386
Gross unrealized losses $ (38) $ (36)
Number of securities | security 65 43
Non-U.S. corporate | Energy    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 173 $ 78
Less than 12 months, Gross unrealized losses $ (2) $ (6)
Less than 12 months, Number of securities in a continuous loss position | security 31 16
12 months or more, Fair value $ 328 $ 358
12 months or more, Gross unrealized losses $ (35) $ (30)
12 months or more, Number of securities in a continuous loss position | security 37 49
Fair value $ 501 $ 436
Gross unrealized losses $ (37) $ (36)
Number of securities | security 68 65
Non-U.S. corporate | Finance and insurance    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 344 $ 85
Less than 12 months, Gross unrealized losses $ (6) $ (1)
Less than 12 months, Number of securities in a continuous loss position | security 62 14
12 months or more, Fair value $ 726 $ 800
12 months or more, Gross unrealized losses $ (84) $ (74)
12 months or more, Number of securities in a continuous loss position | security 95 109
Fair value $ 1,070 $ 885
Gross unrealized losses $ (90) $ (75)
Number of securities | security 157 123
Non-U.S. corporate | Consumer—non-cyclical    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 77 $ 0
Less than 12 months, Gross unrealized losses $ (2) $ 0
Less than 12 months, Number of securities in a continuous loss position | security 25 0
12 months or more, Fair value $ 376 $ 390
12 months or more, Gross unrealized losses $ (71) $ (64)
12 months or more, Number of securities in a continuous loss position | security 43 43
Fair value $ 453 $ 390
Gross unrealized losses $ (73) $ (64)
Number of securities | security 68 43
Non-U.S. corporate | Technology and communications    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 97 $ 29
Less than 12 months, Gross unrealized losses $ (3) $ (2)
Less than 12 months, Number of securities in a continuous loss position | security 25 13
12 months or more, Fair value $ 428 $ 435
12 months or more, Gross unrealized losses $ (69) $ (61)
12 months or more, Number of securities in a continuous loss position | security 51 48
Fair value $ 525 $ 464
Gross unrealized losses $ (72) $ (63)
Number of securities | security 76 61
Non-U.S. corporate | Industrial    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 129 $ 18
Less than 12 months, Gross unrealized losses $ (2) $ (1)
Less than 12 months, Number of securities in a continuous loss position | security 25 10
12 months or more, Fair value $ 237 $ 259
12 months or more, Gross unrealized losses $ (30) $ (26)
12 months or more, Number of securities in a continuous loss position | security 34 35
Fair value $ 366 $ 277
Gross unrealized losses $ (32) $ (27)
Number of securities | security 59 45
Non-U.S. corporate | Capital goods    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 117 $ 0
Less than 12 months, Gross unrealized losses $ (1) $ 0
Less than 12 months, Number of securities in a continuous loss position | security 20 0
12 months or more, Fair value $ 326 $ 332
12 months or more, Gross unrealized losses $ (32) $ (29)
12 months or more, Number of securities in a continuous loss position | security 43 42
Fair value $ 443 $ 332
Gross unrealized losses $ (33) $ (29)
Number of securities | security 63 42
Non-U.S. corporate | Consumer—cyclical    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 64 $ 0
Less than 12 months, Gross unrealized losses $ (2) $ 0
Less than 12 months, Number of securities in a continuous loss position | security 9 0
12 months or more, Fair value $ 98 $ 130
12 months or more, Gross unrealized losses $ (9) $ (8)
12 months or more, Number of securities in a continuous loss position | security 13 15
Fair value $ 162 $ 130
Gross unrealized losses $ (11) $ (8)
Number of securities | security 22 15
Non-U.S. corporate | Transportation    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 95 $ 34
Less than 12 months, Gross unrealized losses $ (2) $ (1)
Less than 12 months, Number of securities in a continuous loss position | security 11 4
12 months or more, Fair value $ 225 $ 229
12 months or more, Gross unrealized losses $ (22) $ (20)
12 months or more, Number of securities in a continuous loss position | security 28 29
Fair value $ 320 $ 263
Gross unrealized losses $ (24) $ (21)
Number of securities | security 39 33
Non-U.S. corporate | Other    
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, Fair value $ 62 $ 0
Less than 12 months, Gross unrealized losses $ (1) $ 0
Less than 12 months, Number of securities in a continuous loss position | security 13 0
12 months or more, Fair value $ 167 $ 176
12 months or more, Gross unrealized losses $ (19) $ (18)
12 months or more, Number of securities in a continuous loss position | security 24 25
Fair value $ 229 $ 176
Gross unrealized losses $ (20) $ (18)
Number of securities | security 37 25