v3.26.3
Financial Instruments - Gross Unrealized Losses and Fair Values for Investments in Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months, Fair Value $ 100,014 $ 6,522
Less than 12 Months, Unrealized Loss (2,251) (13)
12 Months or Greater, Fair Value 2,984 6,638
12 Months or Greater, Unrealized Loss (196) (165)
Total Fair Value 102,998 13,160
Total Unrealized Loss (2,447) (178)
Government bonds    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months, Fair Value 62,455 4,230
Less than 12 Months, Unrealized Loss (1,336) (9)
12 Months or Greater, Fair Value 720 1,174
12 Months or Greater, Unrealized Loss (35) (17)
Total Fair Value 63,175 5,404
Total Unrealized Loss (1,371) (26)
Corporate debt securities    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months, Fair Value 20,095 915
Less than 12 Months, Unrealized Loss (290) 0
12 Months or Greater, Fair Value 778 2,429
12 Months or Greater, Unrealized Loss (6) (24)
Total Fair Value 20,873 3,344
Total Unrealized Loss (296) (24)
Mortgage-backed and asset-backed securities    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months, Fair Value 17,464 1,377
Less than 12 Months, Unrealized Loss (625) (4)
12 Months or Greater, Fair Value 1,486 3,035
12 Months or Greater, Unrealized Loss (155) (124)
Total Fair Value 18,950 4,412
Total Unrealized Loss $ (780) $ (128)