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Product Warranty and Related Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Product warranty and related liabilities        
Warranty balance at beginning of period $ 11,698 $ 10,043 $ 10,571 $ 9,295
Warranties issued and assumed in period – recall campaigns 169 171 783 826
Warranties issued and assumed in period – product warranty 1,506 1,143 3,182 2,699
Payments (1,390) (1,152) (3,922) (3,206)
Adjustments to pre-existing warranties 1,426 444 2,732 1,080
Effect of foreign currency and other (15) 11 50 (35)
Warranty balance at end of period 13,395 10,660 13,395 10,660
Less: Supplier recoveries balance at end of period 386 512 386 512
Warranty balance, net of supplier recoveries at end of period 13,009 10,147 13,009 10,147
Product warranty expense, net of recoveries        
Warranties issued and assumed in period 1,675 1,314 3,965 3,525
Supplier recoveries accrued in period (81) (78) (418) (216)
Adjustments and other 1,411 455 2,782 1,045
Warranty expense, net of supplier recoveries $ 3,006 $ 1,691 $ 6,329 $ 4,354