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Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Automotive [Member] | Not Designated as Hedges [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | $ 5,133 |  | $ 5,133 |  | $ 3,413
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 | 32 | $ 27 | 171 | $ 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 | 994 |  | 994 |  | 827
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | 4,327 |  | 4,327 |  | 2,710
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | 761 |  | 761 |  | 658
Automotive [Member] | Not Designated as Hedges [Member] | PSA Warrants [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | 45 |  | 45 |  | 45
GM Financial [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | 107,601 |  | 107,601 |  | 113,871
Collateral available for netting |  |  |  |  | 451
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Swap [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | 13,046 |  | 13,046 |  | 9,533
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Swap [Member] | Fair Value Level 2 [Member] | Other liabilities [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value of derivative instruments |  |  |  |  | 291
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Swap [Member] | Fair Value Level 2 [Member] | Other assets [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value of derivative instruments | 390 |  | 390 |  |
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Foreign Currency Swaps [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | 1,822 |  | 1,822 |  | 1,829
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Interest Rate Swap [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | 504 |  | 504 |  | 768
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Foreign Currency Swaps [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | 3,317 |  | 3,317 |  | 2,075
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 | 88,912 |  | 88,912 |  | 99,666
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 | 378 |  | 378 |  | 520
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 | $ 240 |  | $ 240 |  | $ 372

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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