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Segment Reporting - Summary of key financial information by segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue and others for Reportable Segment [Abstract]      
Net sales and revenue $ 122,485 $ 137,237 $ 147,049
Earnings (loss) before interest and taxes-adjusted 9,710 8,393 11,783
Adjustments (652) (539) (2,905)
Automotive interest expense (4,121) (4,423) (3,880)
Net loss attributable to noncontrolling interests (106) (65) (9)
Income before income taxes 8,095 7,436 8,549
Income tax (expense) (1,774) (769) (474)
Income from continuing operations 6,321 6,667 8,075
Loss from discontinued operations, net of tax 0 0 (70)
Net income attributable to stockholders 6,427 6,732 8,014
Equity in net assets of nonconsolidated affiliates 8,406 8,562 9,215
Goodwill and intangible assets, net 5,230 5,337 5,579
Total Assets 235,194 228,037 227,339
Expenditures for property 5,300 7,592 8,761
Depreciation and amortization 12,676 14,060 13,142
Impairment charges 139 58 527
Equity income 674 1,268 2,163
Disposal Group, Disposed of by Sale, Not Discontinued Operations | FAW-GM      
Revenue and others for Reportable Segment [Abstract]      
Loss on sale of discontinued operations before taxes   (164)  
GMNA | Transformation Activities      
Revenue and others for Reportable Segment [Abstract]      
Restructuring charges and other charges   1,600 1,200
GMI | Transformation Activities      
Revenue and others for Reportable Segment [Abstract]      
Restructuring charges and other charges   115  
GMI | Separation Programs in Korea      
Revenue and others for Reportable Segment [Abstract]      
Deconsolidation loss     1,200
GMI | Brazil | GM Brazil Indirect Tax Claim      
Revenue and others for Reportable Segment [Abstract]      
Estimated potential recovery from taxing authority   1,400  
Operating Segments | Cruise      
Revenue and others for Reportable Segment [Abstract]      
Net sales and revenue 103 100 0
Earnings (loss) before interest and taxes-adjusted (887) (1,004) (728)
Adjustments 0 0 0
Equity in net assets of nonconsolidated affiliates 0 0 0
Goodwill and intangible assets, net 735 634 671
Total Assets 3,625 4,230 3,195
Expenditures for property 15 60 15
Depreciation and amortization 43 21 7
Impairment charges 20 36 0
Equity income 0 0 0
Operating Segments | GM Financial      
Revenue and others for Reportable Segment [Abstract]      
Net sales and revenue 13,831 14,554 14,016
Earnings (loss) before interest and taxes-adjusted 2,702 2,104 1,893
Adjustments 0 0 0
Equity in net assets of nonconsolidated affiliates 1,581 1,455 1,355
Goodwill and intangible assets, net 1,343 1,355 1,356
Total Assets 113,410 108,881 109,953
Expenditures for property 34 47 60
Depreciation and amortization 7,245 7,350 7,531
Impairment charges 0 0 0
Equity income 147 166 183
Eliminations/ Reclassifications      
Revenue and others for Reportable Segment [Abstract]      
Net sales and revenue (118) (114) (110)
Earnings (loss) before interest and taxes-adjusted (14) (18) (4)
Adjustments 0 0 0
Equity in net assets of nonconsolidated affiliates 0 0 0
Goodwill and intangible assets, net 0 0 0
Total Assets (1,466) (1,454) (1,487)
Expenditures for property 0 0 0
Depreciation and amortization 0 0 0
Impairment charges 0 0 0
Equity income 0 0 0
Automotive      
Revenue and others for Reportable Segment [Abstract]      
Automotive interest income 241 429 335
Automotive interest expense (1,098) (782) (655)
Automotive | Operating Segments      
Revenue and others for Reportable Segment [Abstract]      
Net sales and revenue 108,669 122,697 133,143
Earnings (loss) before interest and taxes-adjusted 7,909 7,311 10,622
Adjustments (652) (539) (2,905)
Equity in net assets of nonconsolidated affiliates 6,825 7,107 7,860
Goodwill and intangible assets, net 3,152 3,348 3,552
Total Assets 119,625 116,380 115,678
Expenditures for property 5,251 7,485 8,686
Depreciation and amortization 5,388 6,689 5,604
Impairment charges 119 22 527
Equity income 527 1,102 1,980
Automotive | Operating Segments | GMNA      
Revenue and others for Reportable Segment [Abstract]      
Net sales and revenue 96,733 106,366 113,792
Earnings (loss) before interest and taxes-adjusted 9,071 8,204 10,769
Adjustments (99) (1,618) (1,236)
Equity in net assets of nonconsolidated affiliates 242 84 75
Goodwill and intangible assets, net 2,346 2,459 2,623
Total Assets 114,137 109,290 109,763
Expenditures for property 4,501 6,305 7,784
Depreciation and amortization 4,739 6,112 4,995
Impairment charges 20 15 55
Equity income 17 8 8
Automotive | Operating Segments | GMI      
Revenue and others for Reportable Segment [Abstract]      
Net sales and revenue 11,586 16,111 19,148
Earnings (loss) before interest and taxes-adjusted (528) (202) 423
Adjustments (683) 1,081 (1,212)
Equity in net assets of nonconsolidated affiliates 6,583 7,023 7,761
Goodwill and intangible assets, net 806 888 928
Total Assets 23,019 24,969 24,911
Expenditures for property 729 1,096 883
Depreciation and amortization 624 533 562
Impairment charges 99 7 466
Equity income 510 1,123 1,972
Automotive | Corporate      
Revenue and others for Reportable Segment [Abstract]      
Net sales and revenue 350 220 203
Earnings (loss) before interest and taxes-adjusted (634) (691) (570)
Adjustments 130 (2) (457)
Equity in net assets of nonconsolidated affiliates 0 0 24
Goodwill and intangible assets, net 0 1 1
Total Assets 39,933 32,365 31,694
Expenditures for property 21 84 21
Depreciation and amortization 25 46 50
Impairment charges 0 0 6
Equity income 0 (29) 0
Automotive | Corporate | Ignition Switch Recall Litigations      
Revenue and others for Reportable Segment [Abstract]      
Ignition switch related legal matters     440
Automotive | Eliminations/ Reclassifications      
Revenue and others for Reportable Segment [Abstract]      
Equity in net assets of nonconsolidated affiliates 0 0 0
Goodwill and intangible assets, net 0 0 0
Total Assets (57,464) (50,244) (50,690)
Expenditures for property 0 0 (2)
Depreciation and amortization 0 (2) (3)
Impairment charges 0 0 0
Equity income $ 0 $ 0 $ 0