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Automotive and GM Financial Debt Interest Expense and LT Debt Maturities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Interest Expense $ 2,680 $ 2,059 $ 1,829
Long-term Debt, Maturities, 2017 29,771    
Long-term Debt, Maturities, 2018 17,395    
Long-term Debt, Maturities, 2019 11,357    
Long-term Debt, Maturities, 2020 5,985    
Long-term Debt, Maturities, 2021 5,154    
Long-term Debt, Maturities, Thereafter 15,959    
Long-term Debt, Maturities, Total 85,621    
Automotive [Member]      
Debt Instrument [Line Items]      
Interest Expense 572 443 403
Long-term Debt, Maturities, 2017 1,175    
Long-term Debt, Maturities, 2018 1,655    
Long-term Debt, Maturities, 2019 126    
Long-term Debt, Maturities, 2020 71    
Long-term Debt, Maturities, 2021 56    
Long-term Debt, Maturities, Thereafter 8,168    
Long-term Debt, Maturities, Total 11,251    
Future interest payments on capital lease obligations 371    
GM Financial [Member]      
Debt Instrument [Line Items]      
Financing Interest Expense 2,108 $ 1,616 $ 1,426
Long-term Debt, Maturities, 2017 28,596    
Long-term Debt, Maturities, 2018 15,740    
Long-term Debt, Maturities, 2019 11,231    
Long-term Debt, Maturities, 2020 5,914    
Long-term Debt, Maturities, 2021 5,098    
Long-term Debt, Maturities, Thereafter 7,791    
Long-term Debt, Maturities, Total $ 74,370