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Investments in Debt and Equity Securities - Schedule of Cost Basis and Fair Value of Available-for-Sale Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments in Debt and Equity Securities    
Cost Basis $ 3,360 $ 4,114
Unrealized Pretax Net Gains (Losses) (44) (72)
Fair Value 3,316 4,042
U.S. treasury bonds    
Schedule of Investments in Debt and Equity Securities    
Cost Basis 9 10
Unrealized Pretax Net Gains (Losses) 0 0
Fair Value 9 10
Other U.S. and non-U.S. government bonds    
Schedule of Investments in Debt and Equity Securities    
Cost Basis 70 71
Unrealized Pretax Net Gains (Losses) (2) (3)
Fair Value 68 68
Corporate bonds and other debt securities    
Schedule of Investments in Debt and Equity Securities    
Cost Basis 2,437 3,199
Unrealized Pretax Net Gains (Losses) (14) (29)
Fair Value 2,423 3,170
Asset-backed securities    
Schedule of Investments in Debt and Equity Securities    
Cost Basis 223 220
Unrealized Pretax Net Gains (Losses) (1) (1)
Fair Value 222 219
U.S. governmental agency    
Schedule of Investments in Debt and Equity Securities    
Cost Basis 488 476
Unrealized Pretax Net Gains (Losses) (23) (33)
Fair Value 465 443
Residential    
Schedule of Investments in Debt and Equity Securities    
Cost Basis 2 2
Unrealized Pretax Net Gains (Losses) 0 0
Fair Value 2 2
Commercial    
Schedule of Investments in Debt and Equity Securities    
Cost Basis 131 136
Unrealized Pretax Net Gains (Losses) (4) (6)
Fair Value $ 127 $ 130