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Asset Impairment Expense (Tables)
3 Months Ended
Mar. 31, 2016
Impairment or Disposal of Tangible Assets Disclosure [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset
 
Three Months Ended March 31,
(in millions)
2016
 
2015
Buffalo Gap II
$
159

 
$

Other

 
8

Total asset impairment expense
$
159

 
$
8