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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Capitalized Interest [Line Items] |  |  |  |
Interest costs incurred | $ 225 | $ 167 | $ 449 | $ 242
Dividends Payable, Date Declared | Jun. 25, 2014 |  |  |
Authorized Quarterly Rate Of Common Stock Dividend | $ 0.3125 |  |  |
Dividends Payable, Date to be Paid | Aug. 01, 2014 |  |  |
Dividends Payable, Date of Record | Jul. 15, 2014 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares |  | 91 |  |
Property, Plant, Equipment and Mining Development Costs, Net [Member] |  |  |  |
Capitalized Interest [Line Items] |  |  |  |
Interest costs capitalized | 39 | 27 | 79 | 45
Oil and Gas Properties Not Subject to Amortization [Member] |  |  |  |
Capitalized Interest [Line Items] |  |  |  |
Interest costs capitalized | $ 22 | $ 8 | $ 45 | $ 8

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