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Segment Reporting - Revenues and long-lived assets by geographic region (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]      
GM Financial $ 13,414 $ 13,812 $ 14,540
Net Sales and Revenue 127,004 122,485 137,237
Long-Lived Assets 79,044 77,451 80,872
Automotive | U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Automotive net sales and revenue 92,771 89,204 97,887
Long-Lived Assets 27,192 24,932 25,401
Automotive | Non-U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Automotive net sales and revenue 20,819 19,469 24,810
Long-Lived Assets 13,771 12,516 13,190
GM Financial      
Revenues from External Customers and Long-Lived Assets [Line Items]      
GM Financial 13,414 13,812 14,540
GM Financial | U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
GM Financial 11,712 12,227 12,727
Long-Lived Assets 34,452 36,773 39,509
GM Financial | Non-U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
GM Financial 1,702 1,585 1,813
Long-Lived Assets $ 3,629 $ 3,230 $ 2,772