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Supplemental Cash Flows Information (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011
Cash payments (receipts) for interest and taxes: |  |
Interest - net of amounts capitalized | $ 194 | $ 179
Tax refunds - net | (2) | (95)
Details of debt exchange: |  |
Pollution-control bonds redeemed | 0 | (56)
Pollution-control bonds issued | 0 | 56
Dividends declared but not paid: |  |
Preferred and preference stock | 34 | 15
Accrued capital expenditures | $ 408 | $ 341

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