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Valuation and Qualifying Accounts (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2013 USD ($)
Valuation and Qualifying Accounts Disclosure [Line Items]
Decrease in allowance for doubtful accounts	$ (1)

X

- Definition

Amount of increase (decrease) in the allowance for doubtful accounts.

+ References

No definition available.

+ Details

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

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