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Discontinued Operations - Narrative (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
Jul. 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  
Opel/Vauxhall Business and Fincos [Member] | Discontinued Operations                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Net consideration for transferred business $ 2,500                
Charge at closing 6,200                
Loss from discontinued operations, net of tax 3,900         0 70 4,212  
Income tax expense (benefit)           $ 0 $ 0 1,483  
Opel/Vauxhall Business [Member] | Discontinued Operations                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Underfunded pension liabilities of current employees transferred to PSA Group               3,100  
Payment to PSA Group at closing for assumed underfunded pension liabilities               $ 3,400  
Warrants received                 $ 808
Income tax expense (benefit) $ 2,300