Derivative Instruments and Hedging Activities - Fair Value Amounts and (Gain) Loss on Commodity Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	$ 221		$ 15
Derivative Liability, Fair Value	62		37
Total Cash Received in Settlement of Commodity Derivative Instruments	(208)	$ (14)
Total Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments	(181)	226
Total (Gain) Loss on Commodity Derivative Instruments	(389)	212
Proceeds from derivative settlement	160
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	221		14
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	59		36
Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0		1
Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	3		$ 1
Crude Oil
Derivatives, Fair Value [Line Items]
Total Cash Received in Settlement of Commodity Derivative Instruments	(210)	(9)
Total Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments	(187)	223
Total (Gain) Loss on Commodity Derivative Instruments	(397)	214
NGL
Derivatives, Fair Value [Line Items]
Total Cash Received in Settlement of Commodity Derivative Instruments	0	0
Total Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments	(10)	0
Total (Gain) Loss on Commodity Derivative Instruments	(10)	0
Natural Gas
Derivatives, Fair Value [Line Items]
Total Cash Received in Settlement of Commodity Derivative Instruments	2	(5)
Total Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments	16	3
Total (Gain) Loss on Commodity Derivative Instruments	$ 18	$ (2)

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 cash inflow provided by derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.

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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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