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Components of Net Postretirement Health Care Costs (Parenthetical) (Detail) (U.S. postretirement plan, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
U.S. postretirement plan
Defined Benefit Plan Disclosure [Line Items]
Unfunded U.S. postretirement plan obligations related to long-term disability benefits	$ 23us-gaap_DefinedBenefitPlanOtherCosts / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember

X

- Details

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

X

- Definition

Amount of other defined benefit plan costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration