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Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Automotive [Member] | Not Designated as Hedges [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | $ 6,052 |  | $ 6,052 |  | $ 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 | 51 | $ 171 | 222 | $ 324 |
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 | 1,000 |  | 1,000 |  | 827
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | 5,251 |  | 5,251 |  | 2,710
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | 758 |  | 758 |  | 658
Automotive [Member] | Not Designated as Hedges [Member] | PSA Warrants [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | 43 |  | 43 |  | 45
GM Financial [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount, derivative financial instruments | 104,116 |  | 104,116 |  | 113,871
Collateral | 258 |  | 258 |  |
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 | 10,702 |  | 10,702 |  | 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 | 384 |  | 384 |  |
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 | 1,744 |  | 1,744 |  | 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 | 553 |  | 553 |  | 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 | 4,269 |  | 4,269 |  | 2,075
GM Financial [Member] | Not Designated as Hedges [Member] | Foreign Currency Swaps [Member] | Fair Value Level 2 [Member] | Other liabilities [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value of derivative instruments | (241) |  | (241) |  |
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 | 86,848 |  | 86,848 |  | 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 | (384) |  | (384) |  | (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 | $ 302 |  | $ 302 |  | $ 372

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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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