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Product Warranty and Related Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Product Warranty and Related Liabilities [Roll Forward]        
Warranty balance at beginning of period $ 7,439 $ 7,990 $ 7,590 $ 8,332
Warranties issued and assumed in period – recall campaigns 357 101 609 515
Warranties issued and assumed in period – product warranty 500 542 1,556 1,599
Payments (754) (723) (2,214) (2,175)
Adjustments to pre-existing warranties 101 (209) 79 (426)
Effect of foreign currency and other (34) (8) (11) (152)
Warranty balance at end of period $ 7,609 $ 7,693 $ 7,609 $ 7,693