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Automotive and GM Financial Debt Interest Expense and LT Debt Maturities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Total interest expense $ 3,880 $ 3,141 $ 2,535
2019 31,994    
2020 23,742    
2021 15,543    
2022 7,479    
2023 6,627    
Thereafter 20,763    
Total 106,148    
Automotive [Member]      
Debt Instrument [Line Items]      
Total interest expense 655 575 563
2019 949    
2020 589    
2021 505    
2022 49    
2023 1,544    
Thereafter 10,826    
Total 14,462    
Future interest payments on capital lease obligations 565    
GM Financial [Member]      
Debt Instrument [Line Items]      
Financing interest expense 3,225 $ 2,566 $ 1,972
2019 31,045    
2020 23,153    
2021 15,038    
2022 7,430    
2023 5,083    
Thereafter 9,937    
Total $ 91,686