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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
9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
contract
Dec. 31, 2024
USD ($)
contract
Total unrealized losses    
Fixed income securities, at fair value $ 57,186 $ 52,747
Fixed income securities    
Less than 12 months    
Number of  issues | contract 843 2,204
Fair value $ 12,770 $ 22,824
Unrealized losses $ (89) $ (491)
12 months or more    
Number of  issues | contract 1,584 2,583
Fair value $ 6,701 $ 10,500
Unrealized losses (305) (739)
Total unrealized losses    
Total unrealized losses (394) (1,230)
Fixed income securities, at fair value 8 16
Fixed income securities, unrealized losses 0 1
Fixed income securities, credit loss allowance $ 1 $ 3
U.S. government and agencies    
Less than 12 months    
Number of  issues | contract 36 179
Fair value $ 6,679 $ 8,520
Unrealized losses $ (16) $ (256)
12 months or more    
Number of  issues | contract 74 99
Fair value $ 260 $ 801
Unrealized losses (4) (74)
Total unrealized losses    
Total unrealized losses (20) (330)
Fixed income securities, at fair value $ 13,525 $ 11,108
Municipal    
Less than 12 months    
Number of  issues | contract 342 990
Fair value $ 2,262 $ 4,889
Unrealized losses $ (49) $ (67)
12 months or more    
Number of  issues | contract 526 1,089
Fair value $ 958 $ 1,693
Unrealized losses (50) (109)
Total unrealized losses    
Total unrealized losses (99) (176)
Fixed income securities, at fair value $ 6,226 $ 8,842
Corporate    
Less than 12 months    
Number of  issues | contract 351 943
Fair value $ 3,030 $ 9,178
Unrealized losses $ (18) $ (166)
12 months or more    
Number of  issues | contract 852 1,237
Fair value $ 5,393 $ 7,877
Unrealized losses (242) (544)
Total unrealized losses    
Total unrealized losses (260) (710)
Fixed income securities, at fair value $ 32,880 $ 30,192
Foreign government    
Less than 12 months    
Number of  issues | contract 45 42
Fair value $ 173 $ 159
Unrealized losses $ (3) $ (2)
12 months or more    
Number of  issues | contract 56 73
Fair value $ 43 $ 73
Unrealized losses (7) (8)
Total unrealized losses    
Total unrealized losses (10) (10)
Fixed income securities, at fair value $ 1,435 $ 1,364
ABS    
Less than 12 months    
Number of  issues | contract 20 15
Fair value $ 85 $ 76
Unrealized losses $ (1) $ 0
12 months or more    
Number of  issues | contract 12 15
Fair value $ 44 $ 51
Unrealized losses (2) (4)
Total unrealized losses    
Total unrealized losses (3) (4)
Fixed income securities, at fair value $ 986 $ 1,145
MBS    
Less than 12 months    
Number of  issues | contract 49 35
Fair value $ 541 $ 2
Unrealized losses $ (2) $ 0
12 months or more    
Number of  issues | contract 64 70
Fair value $ 3 $ 5
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses (2) 0
Fixed income securities, at fair value $ 2,134 $ 96
Investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 695 2,002
Fair value $ 12,102 $ 21,846
Unrealized losses $ (82) $ (473)
12 months or more    
Number of  issues | contract 1,428 2,367
Fair value $ 5,955 $ 9,281
Unrealized losses (271) (655)
Total unrealized losses    
Total unrealized losses $ (353) $ (1,128)
Below investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 148 202
Fair value $ 668 $ 978
Unrealized losses $ (7) $ (18)
12 months or more    
Number of  issues | contract 156 216
Fair value $ 746 $ 1,219
Unrealized losses (34) (84)
Total unrealized losses    
Total unrealized losses $ (41) $ (102)