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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
3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
contract
Dec. 31, 2024
USD ($)
contract
Total unrealized losses    
Fixed income securities, at fair value $ 51,993 $ 52,747
Fixed income securities    
Less than 12 months    
Number of  issues | contract 1,912 2,204
Fair value $ 15,525 $ 22,824
Unrealized losses $ (310) $ (491)
12 months or more    
Number of  issues | contract 2,228 2,583
Fair value $ 9,064 $ 10,500
Unrealized losses (573) (739)
Total unrealized losses    
Total unrealized losses (883) (1,230)
Fixed income securities, at fair value 18 16
Fixed income securities, unrealized losses 1 1
Fixed income securities, credit loss allowance $ 3 $ 3
U.S. government and agencies    
Less than 12 months    
Number of  issues | contract 159 179
Fair value $ 2,952 $ 8,520
Unrealized losses $ (67) $ (256)
12 months or more    
Number of  issues | contract 87 99
Fair value $ 692 $ 801
Unrealized losses (51) (74)
Total unrealized losses    
Total unrealized losses (118) (330)
Fixed income securities, at fair value $ 10,705 $ 11,108
Municipal    
Less than 12 months    
Number of  issues | contract 912 990
Fair value $ 4,909 $ 4,889
Unrealized losses $ (123) $ (67)
12 months or more    
Number of  issues | contract 898 1,089
Fair value $ 1,447 $ 1,693
Unrealized losses (100) (109)
Total unrealized losses    
Total unrealized losses (223) (176)
Fixed income securities, at fair value $ 7,474 $ 8,842
Corporate    
Less than 12 months    
Number of  issues | contract 718 943
Fair value $ 6,842 $ 9,178
Unrealized losses $ (114) $ (166)
12 months or more    
Number of  issues | contract 1,093 1,237
Fair value $ 6,816 $ 7,877
Unrealized losses (412) (544)
Total unrealized losses    
Total unrealized losses (526) (710)
Fixed income securities, at fair value $ 30,767 $ 30,192
Foreign government    
Less than 12 months    
Number of  issues | contract 20 42
Fair value $ 70 $ 159
Unrealized losses $ (1) $ (2)
12 months or more    
Number of  issues | contract 69 73
Fair value $ 61 $ 73
Unrealized losses (7) (8)
Total unrealized losses    
Total unrealized losses (8) (10)
Fixed income securities, at fair value $ 1,334 $ 1,364
ABS    
Less than 12 months    
Number of  issues | contract 103 50
Fair value $ 752 $ 78
Unrealized losses $ (5) $ 0
12 months or more    
Number of  issues | contract 81 85
Fair value $ 48 $ 56
Unrealized losses (3) (4)
Total unrealized losses    
Total unrealized losses (8) (4)
Fixed income securities, at fair value $ 1,713 $ 1,241
Investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 1,678 2,002
Fair value $ 14,096 $ 21,846
Unrealized losses $ (272) $ (473)
12 months or more    
Number of  issues | contract 2,028 2,367
Fair value $ 7,983 $ 9,281
Unrealized losses (500) (655)
Total unrealized losses    
Total unrealized losses $ (772) $ (1,128)
Below investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 234 202
Fair value $ 1,429 $ 978
Unrealized losses $ (38) $ (18)
12 months or more    
Number of  issues | contract 200 216
Fair value $ 1,081 $ 1,219
Unrealized losses (73) (84)
Total unrealized losses    
Total unrealized losses $ (111) $ (102)