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Pension Plans Resulted in Net Pension Liability (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension assets	$ 53us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	$ 54us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
Other accrued liabilities	(23)us-gaap_OtherAccruedLiabilitiesNoncurrent	(38)us-gaap_OtherAccruedLiabilitiesNoncurrent
Accrued pension costs	(2,912)us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent	(1,962)us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent
Total	$ (2,882)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet	$ (1,946)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet

X

- Definition

This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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Balance Type:	credit
Period Type:	instant

X

- Definition

The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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X

- Definition

The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

+ References

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-Publisher FASB

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X

- Definition

The noncurrent portion (due beyond one year or one operating cycle) of other accrued expenses (expenses incurred at the end of the reporting period but not yet paid) not otherwise defined in the taxonomy.

+ References

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