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Significant Accounting Policies - Impact of New Accounting Pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Automotive net sales and revenue |  |  |  |  |  |  |  |  | $ 133,045 |  |  |
Automotive and other cost of sales |  |  |  |  |  |  |  |  | 120,656 | $ 116,229 | $ 121,784 |
Income before income taxes |  |  |  |  |  |  |  |  | 8,549 | 11,863 | 12,008 |
Net income (loss) attributable to stockholders | $ 2,044 | $ 2,534 | $ 2,390 | $ 1,046 | $ (5,151) | $ (2,981) | $ 1,660 | $ 2,608 | 8,014 | (3,864) | $ 9,427 |
Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |
Equipment on operating leases, net (Note 7) | 247 |  |  |  | 1,106 |  |  |  | 247 | 1,106 |  |
Deferred income taxes (Note 17) | 24,082 |  |  |  | 23,544 |  |  |  | 24,082 | 23,544 |  | $ 23,925
Other assets | 5,770 |  |  |  | 4,929 |  |  |  | 5,770 | 4,929 |  | 5,366
Accrued liabilities (Note 12) | 28,049 |  |  |  | 25,996 |  |  |  | 28,049 | 25,996 |  | 28,324
Other liabilities (Note 12) | 12,357 |  |  |  | 12,394 |  |  |  | 12,357 | 12,394 |  | 12,159
Retained earnings | 22,322 |  |  |  | 17,627 |  |  |  | 22,322 | 17,627 |  | 16,581
Accumulated other comprehensive loss | (9,039) |  |  |  | (8,011) |  |  |  | (9,039) | (8,011) |  | (8,109)
GM Financial [Member] |  |  |  |  |  |  |  |  |  |  |  |
Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt and current portion of long-term debt (Note 13) | 30,956 |  |  |  | $ 24,450 |  |  |  | 30,956 | $ 24,450 |  | 24,437
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Automotive net sales and revenue |  |  |  |  |  |  |  |  | 133,045 |  |  |
Automotive and other cost of sales |  |  |  |  |  |  |  |  | 120,656 |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 8,549 |  |  |
Net income (loss) attributable to stockholders |  |  |  |  |  |  |  |  | 8,014 |  |  |
Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |
Equipment on operating leases, net (Note 7) | 247 |  |  |  |  |  |  |  | 247 |  |  |
Deferred income taxes (Note 17) | 24,082 |  |  |  |  |  |  |  | 24,082 |  |  | 444
Other assets |  |  |  |  |  |  |  |  |  |  |  | 195
Accrued liabilities (Note 12) | 28,049 |  |  |  |  |  |  |  | 28,049 |  |  | 2,328
Other liabilities (Note 12) | 12,357 |  |  |  |  |  |  |  | 12,357 |  |  | (235)
Retained earnings | 22,322 |  |  |  |  |  |  |  | 22,322 |  |  | (1,336)
Accumulated other comprehensive loss |  |  |  |  |  |  |  |  |  |  |  | 0
Accounting Standards Update 2014-09 [Member] | GM Financial [Member] |  |  |  |  |  |  |  |  |  |  |  |
Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt and current portion of long-term debt (Note 13) |  |  |  |  |  |  |  |  |  |  |  | 0
Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Newly Adopted Accounting Standard, Modified Retrospective Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Adoption of accounting standards (Note 2) |  |  |  |  |  |  |  |  |  |  |  | 182
Accounting Standards Update 2017-12 and Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Newly Adopted Accounting Standard, Modified Retrospective Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Adoption of accounting standards (Note 2) |  |  |  | $ 108 |  |  |  |  |  |  |  |
Accounting Standards Update 2016-01, Accounting Standards Update 2017-12 and Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes (Note 17) |  |  |  |  |  |  |  |  |  |  |  | (63)
Other assets |  |  |  |  |  |  |  |  |  |  |  | 242
Accrued liabilities (Note 12) |  |  |  |  |  |  |  |  |  |  |  | 0
Other liabilities (Note 12) |  |  |  |  |  |  |  |  |  |  |  | 0
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | 290
Accumulated other comprehensive loss |  |  |  |  |  |  |  |  |  |  |  | (98)
Accounting Standards Update 2016-01, Accounting Standards Update 2017-12 and Accounting Standards Update 2018-02 [Member] | GM Financial [Member] |  |  |  |  |  |  |  |  |  |  |  |
Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt and current portion of long-term debt (Note 13) |  |  |  |  |  |  |  |  |  |  |  | $ (13)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Automotive net sales and revenue |  |  |  |  |  |  |  |  | 944 |  |  |
Automotive and other cost of sales |  |  |  |  |  |  |  |  | 1,021 |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 121 |  |  |
Net income (loss) attributable to stockholders |  |  |  |  |  |  |  |  | 108 |  |  |
Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |
Equipment on operating leases, net (Note 7) | (935) |  |  |  |  |  |  |  | (935) |  |  |
Deferred income taxes (Note 17) | 430 |  |  |  |  |  |  |  | 430 |  |  |
Accrued liabilities (Note 12) | 1,506 |  |  |  |  |  |  |  | 1,506 |  |  |
Other liabilities (Note 12) | (435) |  |  |  |  |  |  |  | (435) |  |  |
Retained earnings | (1,228) |  |  |  |  |  |  |  | (1,228) |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement |  |  |  |  |  |  |  |  |  |  |  |
Automotive net sales and revenue |  |  |  |  |  |  |  |  | 132,101 |  |  |
Automotive and other cost of sales |  |  |  |  |  |  |  |  | 119,635 |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 8,428 |  |  |
Net income (loss) attributable to stockholders |  |  |  |  |  |  |  |  | 7,906 |  |  |
Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |
Equipment on operating leases, net (Note 7) | 1,182 |  |  |  |  |  |  |  | 1,182 |  |  |
Deferred income taxes (Note 17) | 23,652 |  |  |  |  |  |  |  | 23,652 |  |  |
Accrued liabilities (Note 12) | 26,543 |  |  |  |  |  |  |  | 26,543 |  |  |
Other liabilities (Note 12) | 12,792 |  |  |  |  |  |  |  | 12,792 |  |  |
Retained earnings | $ 23,550 |  |  |  |  |  |  |  | $ 23,550 |  |  |

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