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Debt - Interest Expense and LT Debt Maturities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Total interest expense $ 4,423 $ 3,880 $ 3,141
2020 37,499    
2021 21,225    
2022 11,833    
2023 8,584    
2024 5,843    
Thereafter 18,967    
Total 103,951    
Automotive      
Debt Instrument [Line Items]      
Total interest expense 782 655 575
2020 1,912    
2021 535    
2022 70    
2023 1,546    
2024 48    
Thereafter 10,807    
Total 14,918    
Finance lease obligations 14,386 13,963  
GM Financial      
Debt Instrument [Line Items]      
Financing interest expense 3,641 3,225 $ 2,566
2020 35,587    
2021 20,690    
2022 11,763    
2023 7,038    
2024 5,795    
Thereafter 8,160    
Total 89,033    
Finance lease obligations $ 88,938 $ 90,988