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Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Decrease (increase) in current assets:
Receivables, net	$ 409	$ 1,159
Inventories	(1,074)	(471)
Income taxes receivable	79	(14)
Prepaid expenses and other	(233)	6
Increase (decrease) in current liabilities:
Accounts payable	561	410
Accrued expenses	181	(100)
Taxes other than income taxes	318	9
Income taxes payable	14	(96)
Changes in current assets and current liabilities	255	903
Cash Flows Related to Interest and Income Taxes
Interest paid in excess of amount capitalized	56	45
Income taxes paid, net	$ 48	$ 142

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- Definition

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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