XML 71 R60.htm IDEA: XBRL DOCUMENT
v3.21.2

Derivative Financial Instruments - Balance Sheet Location of GM Financial Unsecured Debt (Details) - Fair Value Hedges - GM Financial - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | $ 24,622 | $ 23,315
Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships | (381) | (739)
Long-term unsecured debt |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 22,756 | 18,457
Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships | (356) | (670)
Cumulative fair value adjustment on discontinued hedging relationships | 223 | 200
Short-term unsecured debt |  |
Derivatives, Fair Value [Line Items] |  |
Carrying Amount of Hedged Items | 1,866 | 4,858
Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships | $ (25) | $ (69)

X
- Definition Derivative Liabilities, Fair Value Adjustment on Discontinued Hedging Relationships + References No definition available. + Details
Name: | gm_DerivativeLiabilitiesFairValueAdjustmentOnDiscontinuedHedgingRelationships
Namespace Prefix: | gm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Derivative Liabilities, Increase (Decrease) in Fair Value Adjustment + References No definition available. + Details
Name: | gm_DerivativeLiabilitiesIncreaseDecreaseInFairValueAdjustment
Namespace Prefix: | gm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of liability hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
Name: | us-gaap_HedgedLiabilityFairValueHedge
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_FairValueHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gm_BusinessGroupAxis=gm_GmFinancialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_LongTermDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_ShortTermDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |