XML 103 R86.htm IDEA: XBRL DOCUMENT v3.8.0.1

Pensions And Other Postretirement Benefits Assets and Fair Value Measurements (Details) - Pension Plan [Member] - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	$ 48,215	$ 46,329
Plan assets measured at net asset value	13,522	14,155
Other plan assets (liabilities), net	902	1,138
Net plan assets	62,639	61,622	$ 61,072
U.S. [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	8,911	8,326
U.S. [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	12,116	11,374
U.S. [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	26,122	25,452
U.S. [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	1,066	1,177
U.S. [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	6,632	6,509
U.S. [Member] | Private Equity and Debt Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	3,539	4,012
U.S. [Member] | Real estate investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	3,351	3,634
U.S. [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	9,444	8,774
U.S. [Member] | Level 1 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	8,892	8,288
U.S. [Member] | Level 1 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
U.S. [Member] | Level 1 [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
U.S. [Member] | Level 1 [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	552	486
U.S. [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	38,374	37,149
U.S. [Member] | Level 2 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	17	35
U.S. [Member] | Level 2 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	12,116	11,374
U.S. [Member] | Level 2 [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	26,122	25,452
U.S. [Member] | Level 2 [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	119	288
U.S. [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	397	406
U.S. [Member] | Level 3 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2	3
U.S. [Member] | Level 3 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
U.S. [Member] | Level 3 [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
U.S. [Member] | Level 3 [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	395	403
Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	7,614	6,864
Plan assets measured at net asset value	7,013	6,066
Other plan assets (liabilities), net	(132)	(131)
Net plan assets	14,495	12,799	$ 12,794
Non-U.S. [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	585	981
Non-U.S. [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3,853	3,221
Non-U.S. [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,566	2,043
Non-U.S. [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	610	619
Non-U.S. [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	5,346	4,428
Non-U.S. [Member] | Private Equity and Debt Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	570	546
Non-U.S. [Member] | Real estate investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	1,097	1,092
Non-U.S. [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	601	1,015
Non-U.S. [Member] | Level 1 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	578	978
Non-U.S. [Member] | Level 1 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
Non-U.S. [Member] | Level 1 [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
Non-U.S. [Member] | Level 1 [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	23	37
Non-U.S. [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	6,569	5,417
Non-U.S. [Member] | Level 2 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	1	3
Non-U.S. [Member] | Level 2 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3,853	3,221
Non-U.S. [Member] | Level 2 [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,566	2,040
Non-U.S. [Member] | Level 2 [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	149	153
Non-U.S. [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	444	432
Non-U.S. [Member] | Level 3 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	6	0
Non-U.S. [Member] | Level 3 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
Non-U.S. [Member] | Level 3 [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	3
Non-U.S. [Member] | Level 3 [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	$ 438	$ 429

X

- Definition

Other plan assets and liabilities including, cash held by the plans, net of amounts receivable/payable for unsettled security transactions and payable for investment manager fees, custody fees and other expenses.

+ References

No definition available.

+ Details

Name:	gm_DefinedBenefitPlanAssetsandLiabilitiesNotMeasuredatFairValue
Namespace Prefix:	gm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the fair value of plan assets using net asset value. Excludes plan assets and liabilities not measured at fair value.

+ References

No definition available.

+ Details

Name:	gm_DefinedBenefitPlanFairValueofPlanAssetsMeasuredUsingNetAssetValue
Namespace Prefix:	gm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the fair value of plan assets (net of liabilities other than for benefits) measured on a recurring basis using the fair value hierarchy. Excludes plan assets and liabilities not measured at fair value.

+ References

No definition available.

+ Details

Name:	gm_DefinedBenefitPlanFairValueofPlanAssetsMeasuredonRecurringBasis
Namespace Prefix:	gm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gm_USandSovereignTreasuryandGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gm_OtherpensioninvestmentsnetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gm_InvestmentFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gm_PrivateEquityandDebtFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
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: