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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Automotive [Member] |
Derivative [Line Items] |
Schedule of Notional Amounts for Derivative Financial Instruments | The following table presents the notional amounts based on asset or liability positions of derivative financial instruments in our automotive operations:
| Fair Value Level |  | December 31, 2017 |  | December 31, 2016
Derivatives designated as hedges(a) |  |  |  |  |
Assets |  |  |  |  |
Cash flow hedges |  |  |  |  |
Foreign currency | 2 |  | $ | — |  |  | $ | 803 |
Commodity | 2 |  | — |  |  | 106 |
Total assets |  |  | $ | — |  |  | $ | 909 |
Derivatives not designated as hedges(a) |  |  |  |  |
Assets |  |  |  |  |
Foreign currency | 2/3 |  | $ | 2,834 |  |  | $ | 4,483 |
Commodity | 2 |  | 606 |  |  | 1,061 |
PSA Warrants(b) | 2 |  | 48 |  |  | — |
Total assets |  |  | $ | 3,488 |  |  | $ | 5,544 |
Liabilities |  |  |  |  |
Foreign currency | 2/3 |  | $ | 1,188 |  |  | $ | 470 |
Commodity | 2 |  | — |  |  | 181 |
Total liabilities |  |  | $ | 1,188 |  |  | $ | 651 |
__________
(a) | The fair value of these derivative instruments at December 31, 2017 and 2016 and the gains/losses included in our consolidated income statements and statements of comprehensive income for the years ended December 31, 2017, 2016 and 2015 were insignificant.
(b) | The fair value of the PSA warrants was $764 million at December 31, 2017.
GM Financial [Member] |
Derivative [Line Items] |
Schedule of Notional Amounts for Derivative Financial Instruments | The following table presents the notional amounts based on asset or liability positions of GM Financial's derivative financial instruments:
| Fair Value Level |  | December 31, 2017 |  | December 31, 2016
Derivatives designated as hedges(a) |  |  |  |  |
Assets |  |  |  |  |
Fair value hedges – interest rate swaps | 2 |  | $ | 1,250 |  |  | $ | — |
Cash flow hedges |  |  |  |  |
Interest rate swaps | 2/3 |  | 2,177 |  |  | 3,070 |
Foreign currency | 2 |  | 1,574 |  |  | — |
Total cash flow hedges |  |  | 3,751 |  |  | 3,070 |
Total assets |  |  | $ | 5,001 |  |  | $ | 3,070 |
Liabilities |  |  |  |  |
Fair value hedges – interest rate swaps(b) | 2 |  | $ | 9,860 |  |  | $ | 7,700 |
Cash flow hedges |  |  |  |  |
Interest rate swaps | 2/3 |  | — |  |  | 500 |
Foreign currency | 2 |  | — |  |  | 791 |
Total cash flow hedges |  |  | — |  |  | 1,291 |
Total liabilities |  |  | $ | 9,860 |  |  | $ | 8,991 |
Derivatives not designated as hedges(a) |  |  |  |  |
Assets |  |  |  |  |
Interest rate swaps(c) | 2/3 |  | $ | 38,741 |  |  | $ | 7,959 |
Interest rate caps and floors | 2 |  | 16,840 |  |  | 9,698 |
Foreign currency | 2 |  | 1,201 |  |  | — |
Total assets |  |  | $ | 56,782 |  |  | $ | 17,657 |
Liabilities |  |  |  |  |
Interest rate swaps | 2/3 |  | $ | 8,404 |  |  | $ | 6,170 |
Interest rate caps and floors | 2 |  | 17,953 |  |  | 12,146 |
Total liabilities |  |  | $ | 26,357 |  |  | $ | 18,316 |
__________
(a) | The fair value of these derivative instruments at December 31, 2017 and 2016 and the gains/losses included in our consolidated income statements and statements of comprehensive income for the years ended December 31, 2017, 2016 and 2015 were insignificant.
(b) | The fair value of these derivative instruments was $290 million and $276 million at December 31, 2017 and 2016.
(c) | The fair value of these derivative instruments was $260 million and insignificant at December 31, 2017 and 2016.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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