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Debt and Equity Transactions (Unaudited) Interest, Dividends and Maturities (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Nov. 05, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Oct. 30, 2015
Capitalized Interest [Line Items] |  |  |  |  |  |
Interest costs incurred |  | $ 217 | $ 212 | $ 642 | $ 661 |
Common Stock, Value of Shares Authorized for Issue in Transaction |  |  |  | $ 1,000 |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 98,000,000 |  |
Shares Issued, Price Per Share |  | $ 10.35 |  | $ 10.35 |  |
Proceeds from Issuance of Common Stock, Gross |  |  |  | $ 1,010 |  |
Proceeds from Issuance of Common Stock |  |  |  | 999 | $ 0 |
Fees and Commissions |  |  |  | $ 10 |  |
Entity Common Stock, Shares Outstanding |  |  |  |  |  | 1,155,870,213
Dividends Payable, Date Declared |  |  |  | Sep. 30, 2015 |  |
Dividends declared per share of common stock |  | $ 0.05 | $ 0.3125 | $ 0.2605 | $ 0.9375 |
Dividends Payable, Date to be Paid |  | Nov. 02, 2015 |  |  |  |
Dividends Payable, Date of Record |  | Oct. 15, 2015 |  |  |  |
Property, Plant, Equipment and Mining Development Costs, Net [Member] |  |  |  |  |  |
Capitalized Interest [Line Items] |  |  |  |  |  |
Interest costs capitalized |  | $ 42 | $ 34 | $ 134 | $ 113 |
Oil and Gas Properties Not Subject to Amortization [Member] |  |  |  |  |  |
Capitalized Interest [Line Items] |  |  |  |  |  |
Interest costs capitalized |  | $ 12 | $ 20 | $ 50 | $ 65 |
Subsequent Event [Member] |  |  |  |  |  |
Capitalized Interest [Line Items] |  |  |  |  |  |
Common Stock, Value of Shares Authorized for Issue in Transaction | $ 1,000 |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 34,100,000 |  |  |  |  |
Shares Issued, Price Per Share | $ 12.15 |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross | $ 414 |  |  |  |  |
Proceeds from Issuance of Common Stock | 410 |  |  |  |  |
Fees and Commissions | $ 4 |  |  |  |  |

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