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Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Net sales and revenue $ 36,099 $ 37,266  
Earnings (loss) before automotive interest and taxes-adjusted 2,610 3,554  
Adjustments (942) 0  
Net income (loss) attributable to noncontrolling interests (6) 9  
Income before income taxes 1,576 3,473  
Income tax benefit (expense) (466) (787)  
Income from continuing operations 1,110 2,686  
Loss from discontinued operations, net of tax (Note 19) (70) (69)  
Net income attributable to stockholders 1,046 2,608  
Equity in net assets of nonconsolidated affiliates 9,883 9,416 $ 9,073
Total assets 218,726 230,793 $ 212,482
Depreciation and amortization 3,097 2,722  
Impairment charges 484 21  
Equity income 648 555  
Automotive [Member]      
Segment Reporting Information [Line Items]      
Automotive interest income 64 57  
Automotive interest expense (150) (147)  
Group [Member] | Operating Segments [Member] | Automotive [Member]      
Segment Reporting Information [Line Items]      
Net sales and revenue 32,715 34,650  
Earnings (loss) before automotive interest and taxes-adjusted 2,163 3,326  
Adjustments (942) 0  
Equity in net assets of nonconsolidated affiliates 8,602 8,418  
Total assets 118,776 137,641  
Depreciation and amortization 1,274 1,294  
Impairment charges 484 21  
Equity income 596 509  
Group [Member] | Operating Segments [Member] | GMNA [Member] | Automotive [Member]      
Segment Reporting Information [Line Items]      
Net sales and revenue 27,818 29,338  
Earnings (loss) before automotive interest and taxes-adjusted 2,233 3,471  
Adjustments 0 0  
Equity in net assets of nonconsolidated affiliates 77 77  
Total assets 101,247 105,968  
Depreciation and amortization 1,109 1,102  
Impairment charges 25 15  
Equity income 2 5  
Group [Member] | Operating Segments [Member] | GMI [Member] | Automotive [Member]      
Segment Reporting Information [Line Items]      
Net sales and revenue 4,848 5,138  
Earnings (loss) before automotive interest and taxes-adjusted 189 178  
Adjustments (942) 0  
Equity in net assets of nonconsolidated affiliates 8,525 8,341  
Total assets 28,981 27,955  
Depreciation and amortization 153 191  
Impairment charges 459 1  
Equity income 594 504  
Group [Member] | Operating Segments [Member] | GM Financial [Member] | GM Financial [Member]      
Segment Reporting Information [Line Items]      
Net sales and revenue 3,411 2,748  
Earnings (loss) before automotive interest and taxes-adjusted 443 228  
Adjustments 0 0  
Equity in net assets of nonconsolidated affiliates 1,281 998  
Total assets 101,210 94,684  
Depreciation and amortization 1,823 1,428  
Impairment charges 0 0  
Equity income 52 46  
Group [Member] | Corporate [Member] | Automotive [Member]      
Segment Reporting Information [Line Items]      
Net sales and revenue 49 174  
Earnings (loss) before automotive interest and taxes-adjusted (259) (323)  
Adjustments 0 0  
Equity in net assets of nonconsolidated affiliates 0 0  
Total assets 26,902 39,872  
Depreciation and amortization 12 2  
Impairment charges 0 5  
Equity income 0 0  
Group [Member] | Eliminations [Member] | Automotive [Member]      
Segment Reporting Information [Line Items]      
Equity in net assets of nonconsolidated affiliates 0 0  
Total assets (38,354) (36,154)  
Depreciation and amortization 0 (1)  
Impairment charges 0 0  
Equity income 0 0  
Eliminations [Member]      
Segment Reporting Information [Line Items]      
Net sales and revenue (27) (132)  
Earnings (loss) before automotive interest and taxes-adjusted 4 0  
Adjustments 0 0  
Equity in net assets of nonconsolidated affiliates 0 0  
Total assets (1,260) (1,532)  
Depreciation and amortization 0 0  
Impairment charges 0 0  
Equity income $ 0 $ 0