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Derivative and Hedging Activities - Derivative Instruments Table (Details) MMBbls in Millions, MMBTU in Millions, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($) MMBTU MMBbls	Dec. 31, 2015 USD ($) MMBTU MMBbls	Sep. 30, 2015 USD ($)
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ (177)	$ 512	$ 512
Oil [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls	30.5	32.7
Derivative Assets (Liabilities), at Fair Value, Net	$ (51)	$ 137
Oil [Member] | Fixed-Price Swap [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls	21.8	13.5
Derivative Assets (Liabilities), at Fair Value, Net	$ (49)	$ 144
Oil [Member] | Call Option [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls	8.7	19.2
Derivative Assets (Liabilities), at Fair Value, Net	$ (2)	$ (7)
Natural Gas [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ (67)	$ 130
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	882,000,000	852,000,000
Natural Gas [Member] | Fixed-Price Swap [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ (43)	$ 229
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	640,000,000	500,000,000
Natural Gas [Member] | Call Option [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ (26)	$ (99)
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	160,000,000	295,000,000
Natural Gas [Member] | Collar [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 1	$ 0
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	38,000,000	0
Natural Gas [Member] | Basis Swap [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 1	$ 0
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	44,000,000	57,000,000
Natural Gas Liquids [Member] | Fixed-Price Swap [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ (3)	$ 0
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	36	0
Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ (121)	$ 267

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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

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