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Segment Reporting - Revenues and long-lived assets by geographic region (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
GM Financial net sales and revenue $ 13,812 $ 14,540 $ 14,004
Net Sales and Revenue 122,485 137,237 147,049
Long-Lived Assets 77,451 80,872 82,698
Automotive | U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Automotive net sales and revenue 89,204 97,887 104,413
Long-Lived Assets 24,932 25,401 25,625
Automotive | Non-U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Automotive net sales and revenue 19,469 24,810 28,632
Long-Lived Assets 12,516 13,190 13,263
GM Financial      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net Sales and Revenue 13,812 14,540 14,004
GM Financial | U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
GM Financial net sales and revenue 12,227 12,727 12,169
Long-Lived Assets 36,773 39,509 41,334
GM Financial | Non-U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
GM Financial net sales and revenue 1,585 1,813 1,835
Long-Lived Assets $ 3,230 $ 2,772 $ 2,476