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Accrued and Other Liabilities - Product Warranty and Related Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Product Warranty and Related Liabilities [Roll Forward]        
Warranty balance at beginning of period   $ 7,798 $ 7,590 $ 8,332
Warranties issued and assumed in period – recall campaigns   1,628 745 665
Warranties issued and assumed in period – product warranty   1,773 2,001 2,143
Payments   (2,986) (3,012) (2,903)
Adjustments to pre-existing warranties   41 455 (464)
Effect of foreign currency and other   (12) 19 (183)
Warranty balance at end of period $ 8,242 $ 8,242 $ 7,798 $ 7,590
Takata Passenger-side Airbags        
Loss Contingencies [Line Items]        
Increase in product warranty accrual $ 1,100