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Derivative and Hedging Activities - Derivative Instruments Table (Details) MMBbls in Millions, $ in Millions, MMBTU in Trillions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 USD ($) MMBTU MMBbls | Dec. 31, 2015 USD ($) MMBTU MMBbls | Mar. 31, 2015 USD ($)
Derivative [Line Items] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ 515 | $ 512 | $ 512
Oil [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MMBbls | 36.9 | 32.7 |
Derivative Assets (Liabilities), at Fair Value, Net | $ 74 | $ 137 |
Oil [Member] | Fixed-Price Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MMBbls | 21.2 | 13.5 |
Derivative Assets (Liabilities), at Fair Value, Net | $ 78 | $ 144 |
Oil [Member] | Call Option [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MMBbls | 15.7 | 19.2 |
Derivative Assets (Liabilities), at Fair Value, Net | $ (4) | $ (7) |
Natural Gas [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ 167 | $ 130 |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 728 | 852 |
Natural Gas [Member] | Fixed-Price Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ 241 | $ 229 |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 438 | 500 |
Natural Gas [Member] | Call Option [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ (65) | $ (99) |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 250 | 295 |
Natural Gas [Member] | Basis Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ (9) | $ 0 |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 40 | 57 |

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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