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Guarantees (Product Warranties) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]    
Balance as of January 1 $ 993 $ 1,091
Warranties and performance guarantees issued 219 195
Settlements (208) (216)
Other 6 (28)
Balance as of September 30 $ 1,010 $ 1,042