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Discontinued Operations - Financial Information about Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Oct. 31, 2017
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 $ 0 $ 70 $ 4,212
Discontinued Operations | 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 0 11,257
GM Financial net sales and revenue           0 0 466
Total net sales and revenue           0 0 11,723
Automotive and other cost of sales           0 0 11,049
GM Financial interest, operating and other expenses           0 0 342
Automotive and other selling, general, and administrative expense           0 0 813
Other expense items           0 0 (72)
Loss from discontinued operations before taxes           0 0 553
Loss on sale of discontinued operations before taxes           0 70 2,176
Total loss from discontinued operations before taxes           0 70 2,729
Income tax expense (benefit)           0 0 1,483
Loss from discontinued operations, net of tax $ 3,900         0 70 4,212
Disposal loss               3,900
Discontinued Operations | Opel/Vauxhall Business [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Net sales and revenue           1,129 1,939 853
Purchases and expenses           825 1,422 218
Income tax expense (benefit) $ 2,300              
Amount of deferred tax assets transferred               2,000
Discontinued Operations | Discontinued Operations | Opel/Vauxhall Business [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Cash payments           975 1,849 242
Cash receipts           $ 1,408 $ 2,310 $ 1,161