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SUPPLEMENTAL CASH FLOW INFORMATION
 12 Months Ended
Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]  
SUPPLEMENTAL CASH FLOW INFORMATION
SUPPLEMENTAL CASH FLOW INFORMATION
CASH TRANSACTIONS
 
Years Ended December 31,
(in millions)
2016
 
2015
 
2014
Interest, Net of Amounts Capitalized
$
61

 
$
65

 
$
83

Income Taxes
—

 
—

 
—


NON-CASH TRANSACTIONS
Other significant non-cash investing and financing activities that affected recognized assets and liabilities but did not result in cash receipts or payments were as follows:
 
Years Ended December 31,
(in millions)
2016
 
2015
 
2014
Accrued Capital Expenditures
$
29

 
$
28

 
$
29

Net Cost of Removal of Interim Retirements (1)
8

 
1

 
12

Commitment to Purchase Capital Lease Interests
36

 
—

 
109

Capital Lease Obligations (2)
—

 
—

 
1

Asset Retirement Obligations (3)
(1
)
 
3

 
4

(1) 
The non-cash net cost of removal of interim retirements represents an accrual for future AROs that does not impact earnings.
(2) 
The non-cash change in capital lease obligations represents interest accrued for accounting purposes in excess of interest payments.
(3) 
The non-cash additions to AROs and related capitalized assets represent a revision of estimated asset retirement cost due to changes in timing and amount of the expected future AROs.