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Stockholders' Equity and Noncontrolling Interests Preferred and Common Stock (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) $ / shares | Dec. 31, 2018 USD ($) Votes $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2027 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock shares authorized | shares |  |  |  |  | 2,000 |  |  |
Common stock shares authorized | shares |  |  |  |  | 5,000 |  |  |
Common stock number of shares issued | shares |  |  |  |  | 1,400 |  |  |
Common stock shares outstanding | shares |  |  |  |  | 1,400 | 1,400 |  |
Dividends declared per common share (in dollars per share) | $ / shares |  |  |  |  | $ 1.52 |  |  |
Cash dividends paid on common stock |  |  |  |  | $ 2,144,000,000 | $ 2,215,000,000 | $ 2,337,000,000 |
Number of votes per share | Votes |  |  |  |  | 1 |  |  |
Common shares purchased during period | shares |  |  |  |  | 3 | 120 | 77 |
Amount of common stock purchased during period |  |  |  |  | $ 190,000,000 | $ 4,492,000,000 | $ 2,500,000,000 |
Guarantees - maximum liability |  |  |  |  | $ 2,400,000,000 | $ 1,900,000,000 |  |
GM Cruise [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Investment amount |  |  | $ 1,100,000,000 |  |  |  |  |
GM Cruise [Member] | Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Annual dividend rate |  |  |  |  | 7.00% |  |  |
Proceeds from issuance of preferred stock |  |  | $ 900,000,000 |  |  |  |  |
GM Cruise [Member] | SoftBank Investment Holdings Limited [Member] | Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Ownership interest |  |  | 10.90% |  |  |  |  |
Additional purchase amount |  |  |  |  | $ 1,350,000,000 |  |  |
Ownership interest after completed purchase obligation |  |  |  |  | 18.60% |  |  |
GM Cruise [Member] | Honda Motor Co., Ltd [Member] | Common Class E [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Ownership interest | 5.70% |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ 750,000,000 |  |  |  |  |  |  |
Agreed upon future contributions | $ 2,000,000,000 |  |  |  |  |  |  |
GM Korea [Member] | Korea Development Bank [Member] | Class B Preferred Shares [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Annual dividend rate |  |  |  |  | 1.00% |  |  |
Proceeds from issuance of preferred stock |  |  |  |  | $ 720,000,000 |  |  |
Period to call preferred shares |  |  | 6 years |  |  |  |  |
Financial Guarantee [Member] | GM Korea [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Guarantees - maximum liability |  |  |  |  | 2,800,000,000.0 |  |  |
Forecast [Member] | GM Korea [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Planned capital expenditures |  |  |  |  |  |  |  | $ 2,000,000,000
GM Financial [Member] | Fixed-to-Floating Rate Cumulative Perpetual Preferred Stock, Series B [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock issued |  | $ 500,000,000 |  |  |  |  |  |
Preferred stock par value (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  |  |  |
Liquidation preference of preferred stock per share (in dollars per share) | $ / shares |  | $ 1,000 |  |  |  |  |  |
Annual dividend rate |  | 6.50% |  |  |  |  |  |
GM Financial [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock issued |  |  |  | $ 1,000,000,000 |  |  |  |
Preferred stock par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  |  |  |
Liquidation preference of preferred stock per share (in dollars per share) | $ / shares |  |  |  | $ 1,000 |  |  |  |
Annual dividend rate |  |  |  | 5.75% |  |  |  |
GM |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Amount of common stock purchased during period |  |  |  |  | $ 100,000,000 |  |  |

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