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Debt and Equity Transactions (Unaudited) Interest, Dividends and Maturities (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Capitalized Interest [Line Items] |  |  |  |
Interest costs incurred | $ 215 | $ 225 | $ 425 | $ 449
Dividends Payable, Date Declared |  |  | Jun. 24, 2015 |
Dividends declared per share of common stock | $ 0.1605 | $ 0.3125 | $ 0.2105 | $ 0.625
Authorized Quarterly Rate Of Common Stock Dividend | $ 0.0500 |  |  |
Dividends Payable, Date to be Paid | Aug. 03, 2015 |  |  |
Dividends Payable, Date of Record | Jul. 15, 2015 |  |  |
Special Dividend, Per Share | $ 0.1105 |  |  |
Property, Plant, Equipment and Mining Development Costs, Net [Member] |  |  |  |
Capitalized Interest [Line Items] |  |  |  |
Interest costs capitalized | $ 47 | $ 39 | $ 92 | $ 79
Oil and Gas Properties Not Subject to Amortization [Member] |  |  |  |
Capitalized Interest [Line Items] |  |  |  |
Interest costs capitalized | $ 19 | $ 22 | $ 38 | $ 45

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