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Discontinued Operations Financial Information about Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (loss) from discontinued operations, net of tax $ (770) $ 106 $ (839) $ 114
Discontinued Operations [Member] | Opel/Vauxhall Business and Fincos [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Automotive net sales and revenue 5,005 5,649 9,704 10,567
GM Financial net sales and revenue 139 146 267 286
Total net sales and revenue 5,144 5,795 9,971 10,853
Automotive cost of sales 4,906 5,291 9,466 10,008
GM Financial interest, operating and other expenses 102 101 202 213
Automotive selling, general, and administrative expense 353 339 679 687
Other income and (expense) items (1) 36 2 65
Income (loss) from discontinued operations before taxes (218) 100 (374) 10
Loss on sale of discontinued operations before taxes(a) 836 0 836 0
Total income (loss) from discontinued operations before taxes (1,054) 100 (1,210) 10
Income tax benefit 284 6 371 104
Income (loss) from discontinued operations, net of tax $ (770) $ 106 $ (839) $ 114