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Investments - Schedule of Gross Unrealized Losses and Fair Value by Type and Length of Time Held in a Continuous Unrealized Loss Position (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2025 USD ($) Contract | Dec. 31, 2024 USD ($) Contract
Total unrealized losses |  |
Fixed income securities | $ 59,115 | $ 52,747
Fixed income securities |  |
Less than 12 months |  |
Number of issues | Contract | 874 | 2,204
Fair value | $ 17,417 | $ 22,824
Unrealized losses | $ (139) | $ (491)
12 months or more |  |
Number of issues | Contract | 1,345 | 2,583
Fair value | $ 5,394 | $ 10,500
Unrealized losses | (253) | (739)
Total unrealized losses |  |
Total unrealized losses | (392) | (1,230)
Fixed income securities | 11 | 16
Fixed income securities, unrealized losses | 2 | 1
Fixed income securities, credit loss allowance | $ 1 | $ 3
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | Contract | 74 | 179
Fair value | $ 11,840 | $ 8,520
Unrealized losses | $ (72) | $ (256)
12 months or more |  |
Number of issues | Contract | 54 | 99
Fair value | $ 209 | $ 801
Unrealized losses | (3) | (74)
Total unrealized losses |  |
Total unrealized losses | (75) | (330)
Fixed income securities | $ 18,133 | $ 11,108
Municipal |  |
Less than 12 months |  |
Number of issues | Contract | 106 | 990
Fair value | $ 640 | $ 4,889
Unrealized losses | $ (6) | $ (67)
12 months or more |  |
Number of issues | Contract | 527 | 1,089
Fair value | $ 1,423 | $ 1,693
Unrealized losses | (55) | (109)
Total unrealized losses |  |
Total unrealized losses | (61) | (176)
Fixed income securities | $ 5,643 | $ 8,842
Corporate |  |
Less than 12 months |  |
Number of issues | Contract | 530 | 943
Fair value | $ 3,933 | $ 9,178
Unrealized losses | $ (49) | $ (166)
12 months or more |  |
Number of issues | Contract | 640 | 1,237
Fair value | $ 3,677 | $ 7,877
Unrealized losses | (185) | (544)
Total unrealized losses |  |
Total unrealized losses | (234) | (710)
Fixed income securities | $ 30,401 | $ 30,192
Foreign government |  |
Less than 12 months |  |
Number of issues | Contract | 77 | 42
Fair value | $ 553 | $ 159
Unrealized losses | $ (9) | $ (2)
12 months or more |  |
Number of issues | Contract | 53 | 73
Fair value | $ 40 | $ 73
Unrealized losses | (8) | (8)
Total unrealized losses |  |
Total unrealized losses | (17) | (10)
Fixed income securities | $ 1,460 | $ 1,364
ABS |  |
Less than 12 months |  |
Number of issues | Contract | 58 | 15
Fair value | $ 205 | $ 76
Unrealized losses | $ (2) | $ 0
12 months or more |  |
Number of issues | Contract | 12 | 15
Fair value | $ 42 | $ 51
Unrealized losses | (2) | (4)
Total unrealized losses |  |
Total unrealized losses | (4) | (4)
Fixed income securities | $ 1,352 | $ 1,145
MBS |  |
Less than 12 months |  |
Number of issues | Contract | 29 | 35
Fair value | $ 246 | $ 2
Unrealized losses | $ (1) | $ 0
12 months or more |  |
Number of issues | Contract | 59 | 70
Fair value | $ 3 | $ 5
Unrealized losses | 0 | 0
Total unrealized losses |  |
Total unrealized losses | (1) | 0
Fixed income securities | $ 2,126 | $ 96
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | Contract | 694 | 2,002
Fair value | $ 16,899 | $ 21,846
Unrealized losses | $ (123) | $ (473)
12 months or more |  |
Number of issues | Contract | 1,212 | 2,367
Fair value | $ 4,793 | $ 9,281
Unrealized losses | (229) | (655)
Total unrealized losses |  |
Total unrealized losses | $ (352) | $ (1,128)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | Contract | 180 | 202
Fair value | $ 518 | $ 978
Unrealized losses | $ (16) | $ (18)
12 months or more |  |
Number of issues | Contract | 133 | 216
Fair value | $ 601 | $ 1,219
Unrealized losses | (24) | (84)
Total unrealized losses |  |
Total unrealized losses | $ (40) | $ (102)

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