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Derivative Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
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Automotive [Member] | Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | $ 1,743 | $ 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 | 1,583 | 0
Automotive [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 160 | 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 | 0 | 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 | 160 | 106
Automotive [Member] | Not Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 5,018 | 5,544
Notional amount, derivative liability | 8,673 | 651
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 4,295 | 4,483
Notional amount, derivative liability | 2,173 | 470
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 723 | 1,061
Notional amount, derivative liability | 307 | 181
Automotive [Member] | Not Designated as Hedges [Member] | Interest Rate Swaps [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative liability | 6,193 | 0
GM Financial [Member] | Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 5,821 | 3,070
Notional amount, derivative liability | 9,310 | 8,991
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 3,321 | 3,070
Notional amount, derivative liability | 456 | 1,291
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 asset | 855 | 0
Notional amount, derivative liability | 0 | 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 | 2,466 | 3,070
Notional amount, derivative liability | 456 | 500
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 asset | 2,500 | 0
Notional amount, derivative liability | 8,854 | 7,700
Fair value of derivative liabilities | 238 | 276
GM Financial [Member] | Not Designated as Hedges [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 41,369 | 17,657
Notional amount, derivative liability | 35,791 | 18,316
GM Financial [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |
Derivative [Line Items] |  |
Notional amount, derivative asset | 1,141 | 0
Notional amount, derivative liability | 331 | 0
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 | 24,881 | 7,959
Notional amount, derivative liability | 17,746 | 6,170
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 | 15,347 | 9,698
Notional amount, derivative liability | $ 17,714 | $ 12,146

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