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Revenue - Major Source (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | $ 30,744 | $ 13,363 | $ 59,811 | $ 42,513
Leased vehicle income | 2,304 | 2,386 | 4,625 | 4,849
Finance charge income | 1,036 | 966 | 2,052 | 1,971
Other income | 83 | 63 | 153 | 154
GM Financial net sales and revenue | 3,423 | 3,415 | 6,830 | 6,974
Net sales and revenue | 34,167 | 16,778 | 66,641 | 49,487
Operating Segments | Cruise |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 25 | 28 | 55 | 53
Net sales and revenue | 25 | 28 | 55 | 53
Operating Segments | GM Financial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Leased vehicle income | 2,304 | 2,386 | 4,625 | 4,849
Finance charge income | 1,036 | 966 | 2,052 | 1,972
Other income | 86 | 71 | 156 | 163
GM Financial net sales and revenue | 3,426 | 3,423 | 6,833 | 6,984
Net sales and revenue | 3,426 | 3,423 | 6,833 | 6,984
Eliminations/ Reclassifications |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | (26) | (26) | (51) | (50)
Leased vehicle income | 0 | 0 | 0 | 0
Finance charge income | 0 | 0 | 0 | (1)
Other income | (3) | (8) | (3) | (9)
GM Financial net sales and revenue | (3) | (8) | (3) | (10)
Net sales and revenue | (29) | (34) | (54) | (60)
Automotive |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 30,744 | 13,363 | 59,811 | 42,513
Automotive | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 30,745 | 13,361 | 59,807 | 42,510
Net sales and revenue | 30,745 | 13,361 | 59,807 | 42,510
Automotive | Operating Segments | GMNA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 27,932 | 11,604 | 53,889 | 37,435
Net sales and revenue | 27,932 | 11,604 | 53,889 | 37,435
Automotive | Operating Segments | GMI |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 2,792 | 1,677 | 5,878 | 4,957
Net sales and revenue | 2,792 | 1,677 | 5,878 | 4,957
Automotive | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 21 | 80 | 40 | 118
Net sales and revenue | 21 | 80 | 40 | 118
Vehicle, parts and accessories |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 29,470 | 12,289 | 57,191 | 39,863
Vehicle, parts and accessories | Eliminations/ Reclassifications |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 0 | 0 | 0 | 0
Vehicle, parts and accessories | Automotive | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 29,470 | 12,289 | 57,191 | 39,863
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 26,993 | 10,850 | 51,913 | 35,426
Vehicle, parts and accessories | Automotive | Operating Segments | GMI |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 2,475 | 1,439 | 5,276 | 4,437
Vehicle, parts and accessories | Automotive | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 2 | 0 | 2 | 0
Used vehicles |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 150 | 147 | 391 | 550
Used vehicles | Eliminations/ Reclassifications |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 0 | 0 | 0 | 0
Used vehicles | Automotive | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 150 | 147 | 391 | 550
Used vehicles | Automotive | Operating Segments | GMNA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 137 | 122 | 365 | 498
Used vehicles | Automotive | Operating Segments | GMI |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 13 | 17 | 26 | 42
Used vehicles | Automotive | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 0 | 8 | 0 | 10
Services and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 1,124 | 927 | 2,229 | 2,100
Services and other | Operating Segments | Cruise |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 25 | 28 | 55 | 53
Services and other | Eliminations/ Reclassifications |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | (26) | (26) | (51) | (50)
Services and other | Automotive | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 1,125 | 925 | 2,225 | 2,097
Services and other | Automotive | Operating Segments | GMNA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 802 | 632 | 1,611 | 1,511
Services and other | Automotive | Operating Segments | GMI |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 304 | 221 | 576 | 478
Services and other | Automotive | Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | $ 19 | $ 72 | $ 38 | $ 108

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