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Accrued and Other Liabilities Product Warranty and Related Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Product Warranty and Related Liabilities [Roll Forward]        
Warranty balance at beginning of period   $ 9,279 $ 9,646 $ 7,601
Warranties issued and assumed in period - recall campaigns and courtesy transportation   982 986 2,910
Warranties issued and assumed in period - product warranty   2,552 2,325 2,540
Payments   (3,710) (3,987) (4,326)
Adjustments to pre-existing warranties   625 588 1,187
Effect of foreign currency and other   (27) (279) (266)
Warranty balance at end of period   $ 9,701 $ 9,279 $ 9,646
Warranty Obligations [Member] | GMNA [Member]        
Change in estimate for previously sold vehicles $ 874