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Debt and Equity Transactions (Unaudited) Interest, Dividends and Maturities (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Remainder of 2013 | $ 70,000,000 |  | $ 70,000,000 |
2014 | 616,000,000 |  | 616,000,000 |
2015 | 1,100,000,000 |  | 1,100,000,000 |
2016 | 750,000,000 |  | 750,000,000 |
2017 | 727,000,000 |  | 727,000,000 |
Thereafter | 18,000,000,000 |  | 18,000,000,000 |
Interest costs incurred | 167,000,000 | 55,000,000 | 242,000,000 | 154,000,000
Interest costs capitalized | $ 35,000,000 | $ 12,000,000 | $ 53,000,000 | $ 48,000,000
Supplemental Dividend [Member] |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Dividends Payable, Date Declared | May 31, 2013 |  |  |
Dividends Payable, Amount Per Share (in dollars per share) | $ 1.00 |  | $ 1.00 |
Dividends Payable, Date to be Paid | Jul. 01, 2013 |  |  |
Dividends Payable, Date of Record | Jun. 14, 2013 |  |  |
Quarterly Dividend [Member] |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Dividends Payable, Date Declared | Jun. 27, 2013 |  |  |
Dividends Payable, Amount Per Share (in dollars per share) | $ 0.3125 |  | $ 0.3125 |
Dividends Payable, Date to be Paid | Aug. 01, 2013 |  |  |
Dividends Payable, Date of Record | Jul. 15, 2013 |  |  |

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