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Derivative Financial Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Automotive [Member] | Not Designated as Hedges [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount, derivative financial instruments | $ 5,137 | $ 5,137 | $ 4,676
Automotive [Member] | Not Designated as Hedges [Member] | PSA Group [Member] | Interest Income and Other Non-Operating Income, Net [Member] |  |  |
Derivative [Line Items] |  |  |
Gains on derivative instruments | 27 | 153 |
Automotive [Member] | Not Designated as Hedges [Member] | Fair Value Level 2 [Member] | PSA Group [Member] | Other assets [Member] |  |  |
Derivative [Line Items] |  |  |
Fair value of derivative instruments | 888 | 888 | 764
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount, derivative financial instruments | 4,459 | 4,459 | 4,022
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount, derivative financial instruments | 632 | 632 | 606
Automotive [Member] | Not Designated as Hedges [Member] | PSA Warrants [Member] | Fair Value Level 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount, derivative financial instruments | 46 | 46 | 48
GM Financial [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount, derivative financial instruments | 106,021 | 106,021 | 98,000
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Interest Rate Contract [Member] | Fair Value Level 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount, derivative financial instruments | 1,108 | 1,108 | 2,177
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 financial instruments | 2,122 | 2,122 | 1,574
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Contract [Member] | Fair Value Level 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount, derivative financial instruments | 11,154 | 11,154 | 11,110
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Contract [Member] | Fair Value Level 2 [Member] | Other liabilities [Member] |  |  |
Derivative [Line Items] |  |  |
Fair value of derivative instruments | 460 | 460 | 290
GM Financial [Member] | Not Designated as Hedges [Member] | Interest Rate Contract [Member] | Fair Value Level 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount, derivative financial instruments | 89,753 | 89,753 | 81,938
GM Financial [Member] | Not Designated as Hedges [Member] | Interest Rate Contract [Member] | Fair Value Level 2 [Member] | Other liabilities [Member] |  |  |
Derivative [Line Items] |  |  |
Fair value of derivative instruments | 563 | 563 | 207
GM Financial [Member] | Not Designated as Hedges [Member] | Interest Rate Contract [Member] | Fair Value Level 2 [Member] | Other assets [Member] |  |  |
Derivative [Line Items] |  |  |
Fair value of derivative instruments | 534 | 534 | 329
GM Financial [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount, derivative financial instruments | $ 1,884 | $ 1,884 | $ 1,201

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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