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Accrued and Other Liabilities - Product Warranty and Other Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Product Warranty and Related Liabilities [Roll Forward]    
Warranty balance at beginning of period $ 8,242 $ 7,798
Warranties issued and assumed in period – recall campaigns 120 117
Warranties issued and assumed in period – product warranty 443 498
Payments (733) (881)
Adjustments to pre-existing warranties 11 (19)
Effect of foreign currency and other (6) (115)
Warranty balance at end of period $ 8,077 $ 7,398