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Schedule of Derivative Credit Risk and Fair Value (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Derivative [Line Items]
Net derivative liability with counterparties	$ 23
Collateral posted by the Company with counterparties (classified as an other current receivable)
Potential loss related to the failure of the Company's counterparties to perform	$ 1

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

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