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Supplemental Cash Flow Disclosures Supplemental Cash Flow Disclosures (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Accounts payable related to property, plant and equipment additions	$ 167	$ 231	$ 216
Supplemental Cash Flows Information [Abstract]
Interest paid, net of amounts capitalized	331	358	331
Income taxes received, net	$ 205	$ 425	$ 395

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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