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Debt and Equity Transactions (Unaudited) Interest, Dividends and Maturities (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Capitalized Interest [Line Items] |  |
Interest costs incurred | $ 224 | $ 75
Interest costs capitalized | 63 | 18
Dividends Payable, Date Declared | Mar. 26, 2014 |
Authorized Quarterly Rate Of Common Stock Dividend | $ 0.3125 |
Dividends Payable, Date to be Paid | May 01, 2014 |
Dividends Payable, Date of Record | Apr. 15, 2014 |
Property, Plant, Equipment and Mining Development Costs, Net [Member] |  |
Capitalized Interest [Line Items] |  |
Interest costs capitalized | 40 |
Oil and Gas Properties Not Subject to Amortization [Member] |  |
Capitalized Interest [Line Items] |  |
Interest costs capitalized | $ 23 |

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