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Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 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 | $ 2,641 |  |  | $ 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 | 210 | $ (417) |  |
Automotive | Not Designated as Hedges | Fair Value Level 2 | PSA Group | Other assets |  |  |  |
Derivative [Line Items] |  |  |  |
Fair value of derivative instruments | 1,300 |  |  | 1,100
Automotive | Not Designated as Hedges | Foreign currency | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional | 1,963 |  |  | 2,195
Automotive | Not Designated as Hedges | Commodity | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional | 631 |  |  | 341
Automotive | Not Designated as Hedges | Stellantis warrants, formerly known as PSA warrants | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional | 47 |  |  | 49
GM Financial |  |  |  |
Derivative [Line Items] |  |  |  |
Notional | 134,372 |  |  | 129,566
Fair Value of Assets | 1,374 |  |  | 1,823
Fair Value of Liabilities | 777 |  |  | 672
Collateral | 450 |  |  | 728
GM Financial | Designated as Hedges | Fair Value Hedges | Interest rate swaps | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional | 14,309 |  |  | 10,064
Fair Value of Assets | 251 |  |  | 463
Fair Value of Liabilities | 171 |  |  | 13
GM Financial | Designated as Hedges | Fair Value Hedges | Foreign currency swaps | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional | 1,881 |  |  | 1,958
Fair Value of Assets | 81 |  |  | 128
Fair Value of Liabilities | 37 |  |  | 9
GM Financial | Designated as Hedges | Cash Flow Hedges | Interest rate swaps | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional | 878 |  |  | 921
Fair Value of Assets | 2 |  |  | 0
Fair Value of Liabilities | 18 |  |  | 27
GM Financial | Designated as Hedges | Cash Flow Hedges | Foreign currency swaps | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional | 6,343 |  |  | 5,626
Fair Value of Assets | 201 |  |  | 278
Fair Value of Liabilities | 98 |  |  | 47
GM Financial | Not Designated as Hedges | Interest rate contracts | Fair Value Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional | 110,961 |  |  | 110,997
Fair Value of Assets | 839 |  |  | 954
Fair Value of Liabilities | $ 453 |  |  | $ 576

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