Asset Impairments (Tables)

9 Months Ended

Sep. 30, 2015

Asset Impairments [Abstract]

Summary of details of impairment of long-lived assets

Pre-tax (non-cash) asset impairment charges were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(millions)	2015		2014		2015		2014
US Properties, Primarily Shelf and Deepwater Gulf of Mexico	$	—	$	2	$	11	$	56
Eastern Mediterranean	—		31		32		14
North Sea	—		—		—		94
Total	$	—	$	33	$	43	$	164