XML 105 R89.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Pensions And Other Postretirement Benefits - Target Allocation tables (Details) - Pension Plan | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocations | 100.00% | 100.00%
U.S. | Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocations | 9.00% | 12.00%
U.S. | Corporate and other debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocations | 68.00% | 64.00%
U.S. | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocations | 23.00% | 24.00%
Non-U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocations | 100.00% | 100.00%
Non-U.S. | Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocations | 14.00% | 16.00%
Non-U.S. | Corporate and other debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocations | 69.00% | 66.00%
Non-U.S. | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocations | 17.00% | 18.00%

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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanDebtSecurityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gm_OtherInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |