Impairments and Exploration Expenses (Tables)

9 Months Ended

Sep. 30, 2015

Impairments and Exploration Expenses [Abstract]

Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]

The following table summarizes impairment charges of proved properties:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2015		2014		2015		2014
Total impairments	$	337	$	109	$	381	$	130

Exploration Expenses [Table Text Block]

The following table summarizes the components of exploration expenses:

	Three Months Ended September 30,					Nine Months Ended September 30,
(In millions)	2015			2014		2015		2014
Exploration Expenses
Unproved property impairments	$	563		$	39	$	612	$	140
Dry well costs	(3		)	25		96		80
Geological and geophysical	8			10		23		27
Other	17			22		55		67
Total exploration expenses	$	585		$	96	$	786	$	314