Impairments (Tables)

3 Months Ended

Mar. 31, 2017

Asset Impairment Charges [Abstract]

Details of Impairment of Long-Lived Assets Held and Used by Asset

A summary of our impairments of fixed assets by asset class and other charges for the Current Quarter and the Prior Quarter is as follows:

	Three Months Ended March 31,
	2017		2016
	($ in millions)
Natural gas compressors	$	—	$	20
Buildings and land	—		7
Other	391		11
Total impairments of fixed assets and other	$	391	$	38