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Discontinued Operations Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2017
Jul. 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
Opel/Vauxhall Business and Fincos [Member] | Discontinued Operations [Member]                            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                            
Net consideration for transferred business $ 2,500                          
Cash received from sale 2,200                          
Charge at closing 6,200                          
Loss from discontinued operations, net of tax 3,900                     70 4,212 1
Income tax expense (benefit)                       0 1,483 (323)
Loss on sale of discontinued operations before taxes                       70 2,176 $ 0
Underfunded pension liabilities of retired and former employees retained by GM                         6,800  
Opel/Vauxhall Business [Member] | Discontinued Operations [Member]                            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                            
Warrants received   $ 808                        
De-risking premium payment   455                     455  
Charge at closing                     $ 6,200      
Loss from discontinued operations, net of tax                     3,900      
Income tax expense (benefit) 2,300                   $ 2,300      
Charge for deferred tax assets no longer realizable upon transfer   4,300                        
De-risking premium payment and deferred pension losses   $ 1,500                        
Other costs and charges                         421  
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  
Total net sales and revenue transactions with discontinued operations                       1,900 853  
Purchases and expenses with discontinued operations                       1,400 218  
Fincos [Member] | Discontinued Operations [Member]                            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                            
Loss on sale of discontinued operations before taxes 525                          
Foreign currency translation loss $ 197                          
Discontinued Operations [Member] | Opel/Vauxhall Business [Member] | Discontinued Operations [Member]                            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                            
Cash payments used in operating activities                       1,800 242  
Cash receipts provided by operating activities                       $ 2,300 $ 1,200