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Discontinued Operations Financial Information about Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loss from discontinued operations, net of tax $ 0 $ 770 $ 70 $ 839
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 0 5,005 0 9,704
GM Financial net sales and revenue 0 139 0 267
Total net sales and revenue 0 5,144 0 9,971
Automotive and other cost of sales 0 4,906 0 9,466
GM Financial interest, operating and other expenses 0 102 0 202
Automotive and other selling, general, and administrative expense 0 353 0 679
Other income (expense) items 0 (1) 0 2
Loss from discontinued operations before taxes 0 218 0 374
Loss on sale of discontinued operations before taxes 0 836 70 836
Total loss from discontinued operations before taxes 0 1,054 70 1,210
Income tax expense (benefit) 0 (284) 0 (371)
Loss from discontinued operations, net of tax $ 0 $ 770 $ 70 $ 839