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Schedule of Derivative Credit Risk and Fair Value (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Derivative [Line Items]
Net derivative asset with counterparties	$ 52
Collateral held by the Company (classified as an other current liability)
Potential loss related to the failure of the Company's counterparties to perform	$ 52

Fair value of financial asset or other 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 an obligation to return collateral under a master netting arrangement.

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