Impairments (Tables)

12 Months Ended

Dec. 31, 2013

Table Text Block [Abstract]

Schedule of Impairment Expense

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

millions	2013		2012		2011
Oil and gas exploration and production
Long-lived assets held for use
U.S. onshore properties	$	142	$	259	$	1,063
Gulf of Mexico properties	562		104		162
Cost-method investment	11		13		91
Midstream
Long-lived assets held for use	79		13		458
Impairments	$	794	$	389	$	1,774

Nonrecurring Fair Value Measurements Table

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

millions	2013		2012
Long-lived assets held for use	$	548	$	103
Cost-method investment (1)	32		34

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