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Debt and Equity Transactions (Unaudited) Interest, Dividends and Maturities (Details) - USD ($) shares in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2016 | Jan. 05, 2016 | Nov. 08, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Capitalized Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Interest costs incurred |  |  |  | $ 211,000,000 |  | $ 211,000,000 |  | $ 647,000,000 | $ 622,000,000 |
Common Stock, Value of Shares Authorized for Issue in Transaction | $ 12,000,000 |  |  | $ 12.39 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 33.5 |  |  | 28.0 |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  |  | $ 415,000,000 |  |  | $ 311,000,000 | 1,500,000,000 |  | $ 2,000,000,000
Fees and Commissions |  | $ 20,000,000 |  | 4,000,000 |  |  |  |  |  |
Property, Plant, Equipment and Mining Development Costs, Net [Member] |  |  |  |  |  |  |  |  |  |
Capitalized Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Interest costs capitalized |  |  |  | 24,000,000 |  | 42,000,000 |  | 66,000,000 | 134,000,000 |
Oil and Gas Properties Not Subject to Amortization [Member] |  |  |  |  |  |  |  |  |  |
Capitalized Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Interest costs capitalized |  |  |  | $ 0 | $ 0 | $ 12,000,000 |  | $ 7,000,000 | $ 50,000,000 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Capitalized Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Value of Shares Authorized for Issue in Transaction |  |  | $ 11.54 |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 26.3 |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  | $ 304,000,000 |  |  |  |  |  |  |
Fees and Commissions |  |  | $ 3,000,000 |  |  |  |  |  |  |

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