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Derivative and Hedging Activities - Derivative Instruments Table (Details) MMBbls in Millions, MMBTU in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) MMBTU MMBbls | Dec. 31, 2016 USD ($) MMBTU MMBbls
Derivative [Line Items] |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ (150) | $ (577)
Energy Related Derivative [Member] |  |
Derivative [Line Items] |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ (150) | $ (504)
Energy Related Derivative [Member] | Oil [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Volume | MMBbls | 23 | 28
Derivative Assets (Liabilities), at Fair Value, Net | $ (26) | $ (141)
Energy Related Derivative [Member] | Oil [Member] | Fixed-Price Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Volume | MMBbls | 19 | 23
Derivative Assets (Liabilities), at Fair Value, Net | $ (26) | $ (140)
Energy Related Derivative [Member] | Oil [Member] | Call Option [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Volume | MMBbls | 4 | 5
Derivative Assets (Liabilities), at Fair Value, Net | $ 0 | $ (1)
Energy Related Derivative [Member] | Natural Gas [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 790,000,000 | 924,000,000
Derivative Assets (Liabilities), at Fair Value, Net | $ (125) | $ (363)
Energy Related Derivative [Member] | Natural Gas [Member] | Fixed-Price Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 622,000,000 | 719,000,000
Derivative Assets (Liabilities), at Fair Value, Net | $ (126) | $ (349)
Energy Related Derivative [Member] | Natural Gas [Member] | Call Option [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 102,000,000 | 114,000,000
Derivative Assets (Liabilities), at Fair Value, Net | $ 0 | $ 0
Energy Related Derivative [Member] | Natural Gas [Member] | Collar [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 48,000,000 | 60,000,000
Derivative Assets (Liabilities), at Fair Value, Net | $ 3 | $ (9)
Energy Related Derivative [Member] | Natural Gas [Member] | Basis Protection Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 18,000,000 | 31,000,000
Derivative Assets (Liabilities), at Fair Value, Net | $ (2) | $ (5)
Energy Related Derivative [Member] | NGL [Member] | Fixed-Price Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 27 | 53
Derivative Assets (Liabilities), at Fair Value, Net | $ 1 | $ 0

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