Derivative Instruments and Hedging Activities - Fair Value Amounts and (Gain) Loss on Commodity Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	$ 10		$ 180
Derivative Liability, Fair Value	83		27
Total Cash (Received) Paid in Settlement of Commodity Derivative Instruments	(14)	$ 28
Total Non-cash Portion of Loss on Commodity Derivative Instruments	226	51
Total Loss on Commodity Derivative Instruments	212	79
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	9		180
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	63		1
Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1		0
Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	20		$ 26
Crude Oil
Derivatives, Fair Value [Line Items]
Total Cash (Received) Paid in Settlement of Commodity Derivative Instruments	(9)	30
Total Non-cash Portion of Loss on Commodity Derivative Instruments	223	50
Total Loss on Commodity Derivative Instruments	214	80
Natural Gas
Derivatives, Fair Value [Line Items]
Total Cash (Received) Paid in Settlement of Commodity Derivative Instruments	(5)	(2)
Total Non-cash Portion of Loss on Commodity Derivative Instruments	3	1
Total Loss on Commodity Derivative Instruments	$ (2)	$ (1)

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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Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities 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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