Supplemental Cash Flows Information (Details) (USD $) In Millions	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Cash payments (receipts) for interest and taxes:
Interest - net of amounts capitalized	$ 321	$ 305
Tax payments (refunds)- net	(44)	179
Noncash investing and financing activities:
Accrued capital expenditures	388	333
Purchase of equipment with note payable	56
Details of debt exchange:
Pollution-control bonds redeemed	(56)	(203)
Pollution-control bonds issued	56	203
Consolidation of variable interest entities:
Assets other than cash		(94)
Liabilities and noncontrolling interests		99
Deconsolidation of variable interest entities:
Assets other than cash		380
Liabilities and noncontrolling interests		(476)
Dividends declared but not paid:
Common stock.	104	103
Preferred and preference stock	$ 15	$ 13

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This element represents the carrying amount of assets of variable interest entity, which are consolidated.

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This element represents the carrying amount of liabilities and noncontrolling interests, which are consolidated.

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- Definition

This element represents the carrying amount of assets of variable interest entity, which are deconsolidated.

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This element represents the carrying amount of liabilities and noncontrolling interests, which are deconsolidated.

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Carrying value as of the balance sheet date of dividends declared but unpaid on common stock issued by the entity and outstanding.

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Carrying value as of the balance sheet date of dividends declared but unpaid on preferred and preference securities issued by the entity and outstanding.

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Represents the total of purchase of equipment with note payable.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Designated to encapsulate the entire footnote disclosure that gives information on the supplemental cash flow activities for noncash (or part noncash) transactions for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 32

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 32

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 29

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 27
-Subparagraph f

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The amount of cash paid during the current period for interest owed on money borrowed, net of interest capitalized.

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