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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Automotive [Member] | Not Designated as Hedges [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | $ 4,732 |  | $ 4,732 |  | $ 5,926
Automotive [Member] | Not Designated as Hedges [Member] | PSA Group [Member] | Interest Income and Other Non-Operating Income, Net [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) on derivative instruments | 114 | $ 32 | (303) | $ 171 |
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 | 659 |  | 659 |  | 964
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | 4,236 |  | 4,236 |  | 5,075
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | 451 |  | 451 |  | 806
Automotive [Member] | Not Designated as Hedges [Member] | PSA Warrants [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | 45 |  | 45 |  | 45
GM Financial [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | 131,201 |  | 131,201 |  | 108,673
Fair Value of Assets | 1,706 |  | 1,706 |  | 636
Fair Value of Liabilities | 1,209 |  | 1,209 |  | 519
Collateral | 778 |  | 778 |  | 210
Collateral available for netting | 274 |  | 274 |  |
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Swap [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | 10,894 |  | 10,894 |  | 9,458
Fair Value of Assets | 609 |  | 609 |  | 234
Fair Value of Liabilities | 0 |  | 0 |  | 23
GM Financial [Member] | Designated as Hedges [Member] | Fair Value Hedges [Member] | Foreign Currency Swaps [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | 1,797 |  | 1,797 |  | 1,796
Fair Value of Assets | 26 |  | 26 |  | 22
Fair Value of Liabilities | 68 |  | 68 |  | 71
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Interest Rate Swap [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | 964 |  | 964 |  | 590
Fair Value of Assets | 0 |  | 0 |  | 0
Fair Value of Liabilities | 32 |  | 32 |  | 6
GM Financial [Member] | Designated as Hedges [Member] | Cash Flow Hedges [Member] | Foreign Currency Swaps [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | 5,143 |  | 5,143 |  | 4,429
Fair Value of Assets | 26 |  | 26 |  | 40
Fair Value of Liabilities | 302 |  | 302 |  | 119
GM Financial [Member] | Not Designated as Hedges [Member] | Interest Rate Contract [Member] | Fair Value Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | 112,403 |  | 112,403 |  | 92,400
Fair Value of Assets | 1,045 |  | 1,045 |  | 340
Fair Value of Liabilities | $ 807 |  | $ 807 |  | $ 300

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 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 (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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