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Discontinued Operations Financial Information about Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Loss from discontinued operations, net of tax $ 70 $ 69
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 4,699
GM Financial net sales and revenue 0 128
Total net sales and revenue 0 4,827
Automotive cost of sales 0 4,560
GM Financial interest, operating and other expenses 0 100
Automotive selling, general, and administrative expense 0 326
Other income items 0 3
Loss from discontinued operations before taxes 0 156
Loss on sale of discontinued operations before taxes 70 0
Total loss from discontinued operations before taxes 70 156
Income tax expense (benefit) 0 (87)
Loss from discontinued operations, net of tax $ 70 $ 69