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Discontinued Operations Financial Information about Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2017
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Loss from discontinued operations, net of tax   $ 0 $ 0 $ 0 $ 70 $ 277 $ 3,096 $ 770 $ 69   $ 70 $ 4,212 $ 1
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 11,257 19,704
GM Financial net sales and revenue                     0 466 552
Total net sales and revenue                     0 11,723 20,256
Automotive and other cost of sales                     0 11,049 18,894
GM Financial interest, operating and other expenses                     0 342 423
Automotive and other selling, general, and administrative expense                     0 813 1,356
Other income (expense) items                     0 (72) 93
Loss from discontinued operations before taxes                     0 553 324
Loss on sale of discontinued operations before taxes                     70 2,176 0
Total loss from discontinued operations before taxes                     70 2,729 324
Income tax expense (benefit)                     0 1,483 (323)
Loss from discontinued operations, net of tax $ 3,900                   $ 70 4,212 $ 1
Disposal loss                       3,900  
Discontinued Operations [Member] | Opel/Vauxhall Business [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Income tax expense (benefit) $ 2,300                 $ 2,300      
Loss from discontinued operations, net of tax                   $ 3,900      
Amount of deferred tax assets transferred                       $ 2,000