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Discontinued Operations Financial Information about Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2018
Sep. 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 $ 3,096   $ 70 $ 3,935
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 1,553   0 11,257
GM Financial net sales and revenue 0 147   0 414
Total net sales and revenue 0 1,700   0 11,671
Automotive and other cost of sales 0 1,583   0 11,049
GM Financial interest, operating and other expenses 0 99   0 301
Automotive and other selling, general, and administrative expense 0 134   0 813
Other expense items 0 74   0 72
Loss from discontinued operations before taxes 0 190   0 564
Loss on sale of discontinued operations before taxes 0 1,150   70 1,986
Total loss from discontinued operations before taxes 0 1,340   70 2,550
Income tax expense (benefit) 0 1,756   0 1,385
Loss from discontinued operations, net of tax $ 0 3,096   $ 70 3,935
Disposal loss   3,100     3,700
Discontinued Operations [Member] | Opel/Vauxhall Business [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Other expense items     $ 421    
Income tax expense (benefit)   2,300      
Loss from discontinued operations, net of tax   3,100      
Amount of deferred tax assets transferred   $ 2,000     $ 2,000