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Automotive and GM Financial Debt Interest Expense and LT Debt Maturities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Total interest expense $ 3,141 $ 2,535 $ 1,883
2018 27,030    
2019 18,643    
2020 15,282    
2021 7,861    
2022 5,386    
Thereafter 21,088    
Total 95,290    
Automotive [Member]      
Debt Instrument [Line Items]      
Total interest expense 575 563 423
2018 2,528    
2019 154    
2020 586    
2021 59    
2022 63    
Thereafter 10,611    
Total 14,001    
Future interest payments on capital lease obligations 280    
GM Financial [Member]      
Debt Instrument [Line Items]      
Financing interest expense 2,566 $ 1,972 $ 1,460
2018 24,502    
2019 18,489    
2020 14,696    
2021 7,802    
2022 5,323    
Thereafter 10,477    
Total $ 81,289