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Derivative Financial Instruments - Derivative Financial Instruments (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 16, 2021
Derivative [Line Items] |  |  |  |
Outstanding warrants (in shares) |  |  | 15.0 |
Automotive | Not Designated as Hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative notional amount | $ 2,585 | $ 5,926 |  |
Automotive | Not Designated as Hedges | Foreign Currency | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative notional amount | 2,195 | 5,075 |  |
Automotive | Not Designated as Hedges | Commodity | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative notional amount | 341 | 806 |  |
Automotive | Not Designated as Hedges | PSA Warrants | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative notional amount | 49 | 45 |  |
Automotive | Not Designated as Hedges | Fair Value Hedges | PSA Warrants | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Fair Value of Assets | 1,100 | 964 |  |
GM Financial |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative notional amount | 129,566 | 108,673 |  |
Fair Value of Assets | 1,823 | 636 |  |
Fair Value of Liabilities | 672 | 519 |  |
Collateral | 728 | 210 |  |
GM Financial | Designated as Hedges | Cash Flow Hedges | Interest Rate Swap | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative notional amount | 921 | 590 |  |
Fair Value of Assets | 0 | 0 |  |
Fair Value of Liabilities | 27 | 6 |  |
GM Financial | Designated as Hedges | Cash Flow Hedges | Foreign Currency Swaps | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative notional amount | 5,626 | 4,429 |  |
Fair Value of Assets | 278 | 40 |  |
Fair Value of Liabilities | 47 | 119 |  |
GM Financial | Designated as Hedges | Fair Value Hedges | Interest Rate Swap | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative notional amount | 10,064 | 9,458 |  |
Fair Value of Assets | 463 | 234 |  |
Fair Value of Liabilities | 13 | 23 |  |
GM Financial | Designated as Hedges | Fair Value Hedges | Foreign Currency Swaps | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative notional amount | 1,958 | 1,796 |  |
Fair Value of Assets | 128 | 22 |  |
Fair Value of Liabilities | 9 | 71 |  |
GM Financial | Not Designated as Hedges | Interest Rate Contract | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative notional amount | 110,997 | 92,400 |  |
Fair Value of Assets | 954 | 340 |  |
Fair Value of Liabilities | 576 | 300 |  |
PSA Group | Subsequent Event |  |  |  |
Derivative [Line Items] |  |  |  |
Outstanding warrants (in shares) |  |  |  | 39.7
PSA Group | Nonoperating Income (Expense) | Automotive | Not Designated as Hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Gain on derivative instruments | $ 139 | $ 154 | $ 116 |
Stellantis N.V. | Subsequent Event |  |  |  |
Derivative [Line Items] |  |  |  |
Outstanding warrants (in shares) |  |  |  | 69.2

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