Risk Management and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of Gross and Net Amounts of Derivative Instruments

	March 31, 2020						December 31, 2019
	Gross Amounts of Assets and (Liabilities) Presented in the Balance Sheet		Amounts Not Offset in the Balance Sheet - Financial Instruments		Net Amount		Gross Amounts of Assets and (Liabilities) Presented in the Balance Sheet		Amounts Not Offset in the Balance Sheet - Financial Instruments		Net Amount
	(millions)
Assets:
Commodity derivatives	$	305	$	—	$	305	$	34	$	—	$	34
Liabilities:
Commodity derivatives	$	(238)	$	—	$	(238)	$	(78)	$	—	$	(78)

Schedule of Designated and Non-Designated Derivative Instruments in Statement of Financial Position, Fair Value

The fair value of our derivative instruments that are marked-to-market each period, as well as the location of each within our condensed consolidated balance sheets, by major category, is summarized below. We have no derivative instruments that are designated as hedging instruments for accounting purposes as of March 31, 2020 and December 31, 2019.

Balance Sheet Line Item	March 31, 2020		December 31, 2019		Balance Sheet Line Item	March 31, 2020		December 31, 2019
	(millions)					(millions)
Derivative Assets Not Designated as Hedging Instruments:					Derivative Liabilities Not Designated as Hedging Instruments:
Commodity derivatives:					Commodity derivatives:
Unrealized gains on derivative instruments — current	$	252	$	32	Unrealized losses on derivative instruments — current	$	(192)	$	(58)
Unrealized gains on derivative instruments — long-term	53		2		Unrealized losses on derivative instruments — long-term	(46)		(20)
Total	$	305	$	34	Total	$	(238)	$	(78)

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following summarizes the balance and activity within AOCI relative to our interest rate, commodity and foreign currency cash flow hedges as of and for the three months ended March 31, 2020:

	Interest Rate Cash Flow Hedges		Commodity Cash Flow Hedges		Foreign Currency Cash Flow Hedges (a)		Total
	(millions)
Net deferred (losses) gains in AOCI (beginning balance)	$	(2)	$	(6)	$	1	$	(7)
Net deferred (losses) gains in AOCI (ending balance)	$	(2)	$	(6)	$	1	$	(7)
Deferred losses in AOCI expected to be reclassified into earnings over the next 12 months	$	(1)	$	—	$	—	$	(1)

(a)Relates to Discovery, an unconsolidated affiliate.

The following summarizes the balance and activity within AOCI relative to our interest rate, commodity and foreign currency cash flow hedges as of and for the three months ended March 31, 2019:

	Interest Rate Cash Flow Hedges		Commodity Cash Flow Hedges		Foreign Currency Cash Flow Hedges (a)		Total
	(millions)
Net deferred (losses) gains in AOCI (beginning balance)	$	(3)	$	(6)	$	1	$	(8)
Net deferred (losses) gains in AOCI (ending balance)	$	(3)	$	(6)	$	1	$	(8)

(a)Relates to Discovery, an unconsolidated affiliate.

Schedule of Changes in Derivative Instruments Not Designated as Hedging Instruments

Commodity Derivatives: Statements of Operations Line Item		Three Months Ended March 31,
		2020		2019
	(millions)
Realized gains		$	18	$	27
Unrealized gains (losses)		134		(54)
Trading and marketing gains (losses), net		$	152	$	(27)

Schedule of Net Long or Short Positions Expected to be Realized

	March 31, 2020
	Crude Oil	Natural Gas	Natural Gas Liquids	Natural Gas Basis Swaps
Year of Expiration	Net Short Position (Bbls)	Net Short Position (MMBtu)	Net Short Position (Bbls)	Net Long Position (MMBtu)
2020	(1,410,000)	(27,659,800)	(25,009,803)	8,190,000
2021	(1,467,000)	(45,540,000)	(7,294,133)	4,325,000
2022	(107,000)	(13,687,500)	(104,842)	8,212,500
2023	—	—	—	7,300,000
2024	—	—	—	2,140,000
	March 31, 2019
	Crude Oil	Natural Gas	Natural Gas Liquids	Natural Gas Basis Swaps
Year of Expiration	Net Short Position (Bbls)	Net Short Position (MMBtu)	Net Short Position (Bbls)	Net Long (Short) Position (MMBtu)
2019	(1,191,000)	(32,148,650)	(26,987,090)	2,102,500
2020	(283,000)	(930,000)	(14,388,830)	3,660,000
2021	(100,000)	—	(5,516,168)	(3,650,000)
2022	—	—	(175)	—