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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
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)