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Revenue - Major Source (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | $ 29,067 | $ 29,150
Leased vehicle income | 2,321 | 2,463
Finance charge income | 1,016 | 1,005
Other income | 70 | 91
GM Financial net sales and revenue | 3,407 | 3,559
Net sales and revenue | 32,474 | 32,709
Operating Segments | Cruise |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 30 | 25
Net sales and revenue | 30 | 25
Operating Segments | GM Financial |  |
Disaggregation of Revenue [Line Items] |  |
Leased vehicle income | 2,321 | 2,463
Finance charge income | 1,016 | 1,006
Other income | 70 | 92
GM Financial net sales and revenue | 3,407 | 3,561
Net sales and revenue | 3,407 | 3,561
Eliminations/ Reclassifications |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | (25) | (24)
Leased vehicle income | 0 | 0
Finance charge income | 0 | (1)
Other income | 0 | (1)
GM Financial net sales and revenue | 0 | (2)
Net sales and revenue | (25) | (26)
Automotive |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 29,067 | 29,150
Automotive | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 29,062 | 29,149
Net sales and revenue | 29,062 | 29,149
Automotive | Operating Segments | GMNA |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 25,957 | 25,831
Net sales and revenue | 25,957 | 25,831
Automotive | Operating Segments | GMI |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 3,086 | 3,280
Net sales and revenue | 3,086 | 3,280
Automotive | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 19 | 38
Net sales and revenue | 19 | 38
Vehicle, parts and accessories |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 27,721 | 27,574
Vehicle, parts and accessories | Eliminations/ Reclassifications |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 0 | 0
Vehicle, parts and accessories | Automotive | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 27,721 | 27,574
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 24,920 | 24,576
Vehicle, parts and accessories | Automotive | Operating Segments | GMI |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 2,801 | 2,998
Vehicle, parts and accessories | Automotive | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 0 | 0
Used vehicles |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 241 | 403
Used vehicles | Eliminations/ Reclassifications |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 0 | 0
Used vehicles | Automotive | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 241 | 403
Used vehicles | Automotive | Operating Segments | GMNA |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 228 | 376
Used vehicles | Automotive | Operating Segments | GMI |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 13 | 25
Used vehicles | Automotive | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 0 | 2
Services and other |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 1,105 | 1,173
Services and other | Operating Segments | Cruise |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 30 | 25
Services and other | Eliminations/ Reclassifications |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | (25) | (24)
Services and other | Automotive | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 1,100 | 1,172
Services and other | Automotive | Operating Segments | GMNA |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 809 | 879
Services and other | Automotive | Operating Segments | GMI |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 272 | 257
Services and other | Automotive | Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | $ 19 | $ 36

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