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Derivative Financial Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Automotive [Member] | Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | $ 2,501 | $ 909
Automotive [Member] | Designated as Hedges [Member] | Net Investment Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 1,490 | 0
Automotive [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 1,011 | 909
Automotive [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 732 | 803
Automotive [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 279 | 106
Automotive [Member] | Not Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 11,185 | 5,666
Notional amount, derivative liability | 2,447 | 651
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative liability | 2,083 | 470
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2/3 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 4,200 | 4,605
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 1,177 | 1,061
Notional amount, derivative liability | 364 | 181
Automotive [Member] | Not Designated as Hedges [Member] | Interest Rate Swaps [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 5,808 | 0
GM Financial [Member] | Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative liability | 10,469 | 9,771
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative liability | 802 | 791
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Fair Value Level 2/3 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 3,597 | 3,542
Notional amount, derivative liability | 717 | 1,280
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Swaps [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative liability | 8,950 | 7,700
Fair value of derivative liabilities | 317 | 276
GM Financial [Member] | Not Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 29,441 | 20,712
Notional amount, derivative liability | 30,738 | 20,602
GM Financial [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 617 | 1,576
Notional amount, derivative liability | 1,412 | 119
GM Financial [Member] | Not Designated as Hedges [Member] | Interest Rate Swaps [Member] | Fair Value Level 2/3 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 15,455 | 8,667
Notional amount, derivative liability | 14,225 | 8,337
GM Financial [Member] | Not Designated as Hedges [Member] | Interest Rate Caps and Floors [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 13,369 | 10,469
Notional amount, derivative liability | $ 15,101 | $ 12,146

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