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Related Party Transactions (Current Receivables From Related Parties) (Detail) (Equity Method Investees [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Equity Method Investees [Member]
Related Party Transaction [Line Items]
Current receivables from related parties	$ 3	$ 2

The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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