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Discontinued Operations Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
day
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                            
Income (loss) from discontinued operations, net of tax (Note 3)     $ (277) $ (3,096) $ (770) $ (69) $ (120) $ 5 $ 106 $ 8   $ (4,212) $ (1) $ 25
Line of Credit [Member] | Revolving Credit Facility [Member]                            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                            
Debt term       3 years                    
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                          
Income (loss) from discontinued operations, net of tax (Note 3) (3,900)                     (4,212) (1) 25
Income tax expense (benefit)                       1,483 (323) (678)
Loss on sale of discontinued operations before taxes                       2,176 $ 0 $ 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                        
Warrant vesting period   5 years                        
Threshold to sell the warrants after exercise (in days) | day   35                        
Charge at closing                     $ 6,200      
Income (loss) from discontinued operations, net of tax (Note 3)                     (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                       853    
Purchases and expenses with discontinued operations                       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                       242    
Cash receipts provided by operating activities                       $ 1,200