Impairments (Tables)

12 Months Ended

Dec. 31, 2014

Asset Impairment Charges [Abstract]

Schedule of Impairment Expense

The following summarizes impairments by segment for the years ended December 31:

millions	2014		2013		2012
Oil and gas exploration and production
Long-lived assets held for use
U.S. onshore properties	$	545	$	142	$	259
Gulf of Mexico properties	276		562		104
Cost-method investment	3		11		13
Midstream
Long-lived assets held for use	12		79		13
Total impairments	$	836	$	794	$	389

Nonrecurring Fair Value Measurements Table

The following summarizes the post-impairment fair value of the above-described assets, which was measured using the income approach and Level 3 inputs:

millions	2014		2013
Long-lived assets held for use	$	731	$	548
Cost-method investment (1)	32		32

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⁽¹⁾  This represents the Company’s after-tax net investment.