v3.25.4
Financial Instruments - Gross Unrealized Losses and Fair Values for Investments in Unrealized Loss Position (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months, Fair Value $ 6,522 $ 20,569
Less than 12 Months, Unrealized Loss (13) (249)
12 Months or Greater, Fair Value 6,638 13,227
12 Months or Greater, Unrealized Loss (165) (535)
Total Fair Value 13,160 33,796
Total Unrealized Loss (178) (784)
Government bonds    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months, Fair Value 4,230 11,119
Less than 12 Months, Unrealized Loss (9) (126)
12 Months or Greater, Fair Value 1,174 2,576
12 Months or Greater, Unrealized Loss (17) (88)
Total Fair Value 5,404 13,695
Total Unrealized Loss (26) (214)
Corporate debt securities    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months, Fair Value 915 4,228
Less than 12 Months, Unrealized Loss 0 (17)
12 Months or Greater, Fair Value 2,429 6,838
12 Months or Greater, Unrealized Loss (24) (168)
Total Fair Value 3,344 11,066
Total Unrealized Loss (24) (185)
Mortgage-backed and asset-backed securities    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months, Fair Value 1,377 5,222
Less than 12 Months, Unrealized Loss (4) (106)
12 Months or Greater, Fair Value 3,035 3,813
12 Months or Greater, Unrealized Loss (124) (279)
Total Fair Value 4,412 9,035
Total Unrealized Loss $ (128) $ (385)