Impairments (Tables)

9 Months Ended

Sep. 30, 2020

Impairment Expense [Abstract]

Fair Value Measurements, Nonrecurring

The following table summarizes impairment charges of proved properties, goodwill and equity method investments and their corresponding fair values.

	Three Months Ended September 30,
	2020				2019
(In millions)	Fair Value		Impairment		Fair Value		Impairment
Long-lived assets held for use	$	—	$	1	$	—	$	—
Equity method investment	$	23	$	18	N/A		$	—

	Nine Months Ended September 30,
	2020				2019
(In millions)	Fair Value		Impairment		Fair Value		Impairment
Long-lived assets held for use	$	—	$	3	$	56	$	24
Goodwill	$	—	$	95	N/A		$	—
Equity method investment	$	119	$	170	N/A		$	—