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Asset Sales and Other Accruals (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Component of Operating Other Cost and Expense [Line Items]
Other (income) expense - net	$ 4	$ 9	$ 5	$ 17
Selling, general, and administrative expenses	123	149	255	278
Caiman Eastern Midstream Llc [Member]
Component of Operating Other Cost and Expense [Line Items]
Business acquisition, percentage of voting interests acquired		100.00%		100.00%
Acquisition related costs		16		16
Project development costs [Member]
Component of Operating Other Cost and Expense [Line Items]
Other (income) expense - net	$ 2	$ 9	$ 2	$ 15

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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