Derivative Instruments and Hedging Activities (Details 2) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	$ 12		$ 12		$ 0
Derivative Liability, Fair Value	6		6		116
Total Cash Received in Settlement of Commodity Derivative Instruments	(4)	$ (132)	(18)	$ (454)
Total Non-cash Portion of Loss (Gain) on Commodity Derivative Instruments	26	77	(127)	507
Total Loss (Gain) on Commodity Derivative Instruments	22	(55)	(145)	53
Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	7		7		0
Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	4		4		102
Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	5		5		0
Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	2		2		$ 14
Crude Oil
Derivatives, Fair Value [Line Items]
Total Cash Received in Settlement of Commodity Derivative Instruments	(4)	(119)	(20)	(395)
Total Non-cash Portion of Loss (Gain) on Commodity Derivative Instruments	27	80	(64)	441
Total Loss (Gain) on Commodity Derivative Instruments	23	(39)	(84)	46
Natural Gas
Derivatives, Fair Value [Line Items]
Total Cash Received in Settlement of Commodity Derivative Instruments	0	(13)	2	(59)
Total Non-cash Portion of Loss (Gain) on Commodity Derivative Instruments	(1)	(3)	(63)	66
Total Loss (Gain) on Commodity Derivative Instruments	$ (1)	$ (16)	$ (61)	$ 7

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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