Supplemental Cash Flow Information (Details) (USD $) In Millions	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Changes in Assets and Liabilities, Exclusive of Changes Shown Separately
Accounts receivable, net	$ 181	$ 357
Inventories	(115)	(200)
Accrued/prepaid pensions	(186)	(99)
Accounts payable	(34)	(14)
Income taxes receivable/payable	267	19
Derivative assets and liabilities	(36)	(58)
Postretirement obligation	(59)	20
Other assets	67	(11)
Other liabilities	(37)	59
Total Changes in Assets and Liabilities, Exclusive of Changes Shown Separately	48	73
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Common stock issued for employee benefit plans	$ 1	$ 147

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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

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The increase (decrease) during the reporting period in the assets (liabilities) created through trading commodity-based derivative instruments.

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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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The increase (decrease) during the reporting period in the amount due to fund non-pension benefits provided to former, retired, and disabled employees.

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The fair value of stock issued in noncash financing activities.

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