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Related Party Transactions - Receivables From Related Parties (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Current receivables from related parties	$ 4	$ 2
Centennial
Related Party Transaction [Line Items]
Current receivables from related parties	2	1
TAME
Related Party Transaction [Line Items]
Current receivables from related parties	$ 2	$ 1

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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