Impairments (Tables)

3 Months Ended

Mar. 31, 2018

Asset Impairment Charges [Abstract]

Schedule of Impairment Expense

The following summarizes impairments of long-lived assets and the related post-impairment fair values by segment:

	Three Months Ended
millions	Impairment		Fair Value (1)
March 31, 2018
Exploration and Production
Gulf of Mexico properties	$	19	$	—
Total	$	19	$	—
March 31, 2017
Exploration and Production
Gulf of Mexico properties	$	204	$	231
WES Midstream	168		49
Other Midstream	1		—
Total	$	373	$	280

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⁽¹⁾  Measured as of the impairment date using the income approach and Level 3 inputs. The primary assumptions used to estimate undiscounted future net cash flows include anticipated future production, commodity prices, and capital and operating costs.