Derivatives (Tables)

12 Months Ended

Dec. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives as they appear on the Balance Sheet

The following tables present the gross fair values of derivative instruments and the reported net amounts along with where they appear on the consolidated balance sheets.

	December 31, 2018
(In millions)	Asset		Liability		Net Asset (Liability)			Balance Sheet Location
Not Designated as Hedges
Commodity	$	131	$	—	$	131		Other current assets
Commodity	—		4		(4		)	Deferred credits and other liabilities
Total Not Designated as Hedges	$	131	$	4	$	127

	December 31, 2017
(In millions)	Asset		Liability		Net Asset (Liability)			Balance Sheet Location
Not Designated as Hedges
Commodity	$	—	$	138	$	(138	)	Other current liabilities
Commodity	—		2		(2		)	Deferred credits and other liabilities
Total Not Designated as Hedges	$	—	$	140	$	(140	)

Schedule of Interest Rate Derivatives

Effects of derivatives designated as fair value hedges

Schedule of Interest Rate Swaps

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

The following table sets forth the net impact of the terminated forward starting interest rate swap derivatives de-designated as cash flow hedges on other comprehensive income (loss).

	Year Ended December 31,
(In millions)	2018		2017			2016
Interest Rate Swaps
Beginning balance	$	—	$	60		$	—
Change in fair value recognized in other comprehensive income	—		(13		)	64
Reclassification from other comprehensive income	—		(47		)	(4		)
Ending balance	$	—	$	—		$	60

Schedule of Notional Amounts of Outstanding Derivative Positions

The following table sets forth outstanding derivative contracts as of December 31, 2018 and the weighted average prices for those contracts:

	2019				2020
Crude Oil	First Quarter	Second Quarter	Third Quarter	Fourth Quarter	Full Year
Three-Way Collars
Volume (Bbls/day)	70,000	70,000	50,000	50,000	—
Weighted average price per Bbl:
Ceiling	$71.21	$71.21	$75.88	$75.88	—
Floor	$55.86	$55.86	$57.80	$57.80	—
Sold put	$48.71	$48.71	$50.80	$50.80	—
Basis Swaps (a)(b)
Volume (Bbls/day)	10,000	10,000	10,000	10,000	15,000
Weighted average price per Bbl	$(0.82)	$(0.82)	$(0.82)	$(0.82)	$(0.94)
NYMEX Roll Basis Swaps
Volume (Bbls/day)	60,000	60,000	60,000	60,000	—
Weighted average price per Bbl	$0.38	$0.38	$0.38	$0.38	—
Natural Gas
Three-Way Collars
Volume (MMBtu/day)	200,000	—	—	—	—
Weighted average price per MMBtu:
Ceiling	$5.25	—	—	—	—
Floor	$3.43	—	—	—	—
Sold put	$2.88	—	—	—	—

^(a) The basis differential price is between WTI Midland and WTI Cushing.

^(b) Between January 1, 2019 andFebruary 12, 2019, we entered into 5,000 Bbls/day of Midland basis swaps for July - December 2019 with an average price of $(2.55) and 1,000 Bbls/day of Clearbrook basis swaps for March - December 2019 with an average price of $(3.50).