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Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jan. 16, 2021 | Dec. 31, 2020
Automotive | Stellantis warrants, formerly known as PSA warrants | Stellantis N.V. |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  | 39.7 |
Automotive | Stellantis warrants, formerly known as PSA warrants | Stellantis N.V. | Common Stock |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of shares called by warrants |  |  |  |  | 69.2 |
Automotive | Not Designated as Hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional | $ 4,164 |  | $ 4,164 |  |  | $ 2,585
Automotive | Not Designated as Hedges | PSA Group | Interest Income and Other Non-Operating Income, Net |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gains (losses) on derivative instruments | 154 | $ 114 | 364 | $ (303) |  |
Automotive | Not Designated as Hedges | Fair Value Level 2 | PSA Group | Other assets |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair value of derivative instruments | 1,500 |  | 1,500 |  |  | 1,100
Automotive | Not Designated as Hedges | Foreign currency | Fair Value Level 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional | 3,024 |  | 3,024 |  |  | 2,195
Automotive | Not Designated as Hedges | Commodity | Fair Value Level 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional | 1,093 |  | 1,093 |  |  | 341
Automotive | Not Designated as Hedges | Stellantis warrants, formerly known as PSA warrants | Fair Value Level 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional | 47 |  | 47 |  |  | 49
GM Financial |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional | 134,811 |  | 134,811 |  |  | 129,566
Fair Value of Assets | 1,305 |  | 1,305 |  |  | 1,823
Fair Value of Liabilities | 627 |  | 627 |  |  | 672
Collateral | 509 |  | 509 |  |  | 728
GM Financial | Designated as Hedges | Fair Value Hedges | Interest rate swaps | Fair Value Level 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional | 18,112 |  | 18,112 |  |  | 10,064
Fair Value of Assets | 319 |  | 319 |  |  | 463
Fair Value of Liabilities | 75 |  | 75 |  |  | 13
GM Financial | Designated as Hedges | Fair Value Hedges | Foreign currency swaps | Fair Value Level 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional | 712 |  | 712 |  |  | 1,958
Fair Value of Assets | 0 |  | 0 |  |  | 128
Fair Value of Liabilities | 30 |  | 30 |  |  | 9
GM Financial | Designated as Hedges | Cash Flow Hedges | Interest rate swaps | Fair Value Level 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional | 835 |  | 835 |  |  | 921
Fair Value of Assets | 4 |  | 4 |  |  | 0
Fair Value of Liabilities | 14 |  | 14 |  |  | 27
GM Financial | Designated as Hedges | Cash Flow Hedges | Foreign currency swaps | Fair Value Level 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional | 6,418 |  | 6,418 |  |  | 5,626
Fair Value of Assets | 204 |  | 204 |  |  | 278
Fair Value of Liabilities | 99 |  | 99 |  |  | 47
GM Financial | Not Designated as Hedges | Interest rate contracts | Fair Value Level 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional | 108,734 |  | 108,734 |  |  | 110,997
Fair Value of Assets | 778 |  | 778 |  |  | 954
Fair Value of Liabilities | $ 409 |  | $ 409 |  |  | $ 576

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