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Product Warranty and Related Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Product Warranty and Related Liabilities [Roll Forward]        
Warranty balance at beginning of period $ 8,133 $ 9,063 $ 8,332 $ 9,069
Warranties issued and assumed in period – recall campaigns 231 191 414 354
Warranties issued and assumed in period – product warranty 536 539 1,057 1,105
Payments (717) (786) (1,452) (1,595)
Adjustments to pre-existing warranties (135) (128) (217) (88)
Effect of foreign currency and other (58) 11 (144) 45
Warranty balance at end of period $ 7,990 $ 8,890 $ 7,990 $ 8,890