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Schedule I - Condensed Parent Company Financial Statements (Related Party Transactions) (Details) (Parent Company [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Parent Company [Member]
Condensed Financial Statements, Captions
Receivables from affiliated companies	$ 128	$ 39
Accounts payable to affiliated companies	$ 12	$ 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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- Definition

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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