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Related Party Transactions (Receivables From Related Parties) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Current receivables from related parties	$ 2	$ 2
Centennial [Member]
Related Party Transaction [Line Items]
Current receivables from related parties	1	2
TAME [Member]
Related Party Transaction [Line Items]
Current receivables from related parties	$ 1	$ 0

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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