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Accrued and Other Liabilities Product Warranty and Related Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Product Warranty and Related Liabilities [Roll Forward]      
Warranty balance at beginning of period $ 9,069 $ 8,550 $ 8,871
Warranties issued and assumed in period – recall campaigns 678 899 878
Warranties issued and assumed in period – product warranty 2,123 2,338 2,108
Payments (3,129) (3,375) (3,670)
Adjustments to pre-existing warranties (495) 636 578
Effect of foreign currency and other 86 21 (215)
Warranty balance at end of period $ 8,332 $ 9,069 $ 8,550