Impairments (Tables)

9 Months Ended

Sep. 30, 2014

Asset Impairment Charges [Abstract]

Schedule of Impairment Expense

The following summarizes impairments by segment:

	Three Months Ended   September 30,				Nine Months Ended   September 30,
millions	2014		2013		2014		2013
Oil and gas exploration and production
Long-lived assets held for use
U.S. onshore properties	$	387	$	—	$	387	$	—
Gulf of Mexico properties	—		593		115		593
Cost-method investment	—		—		2		10
Midstream
Long-lived assets held for use	7		—		10		29
Total impairments	$	394	$	593	$	514	$	632

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	$	661	$	266
Cost-method investment (1)	32		32

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