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STOCKHOLDER'S EQUITY (Tables)
 6 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Changes in Accumulated Other Comprehensive Income
The following table provides the components of changes in AOCI for the three and six months ended June 30, 2017 and 2016:
 
Three months ended
 
Six months ended
 
June 30,
 
June 30,
(in millions)
2017
 
2016
 
2017
 
2016
Balance at the beginning of period
$
2

 
$
2

 
$
2

 
$
4

Derivative instruments
 
 
 
 
 
 
 
Loss on interest rate swaps relating to interest rate cash flow hedges (net of tax of $1 and $4 for the three months ended June 30, 2017 and 2016, respectively, and net of tax of $2 and $6 for the six months ended June 30, 2017 and 2016, respectively)
(2
)
 
(5
)
 
(2
)
 
(7
)
Balance at the end of period (a) (b)
$
—

 
$
(3
)
 
$
—

 
$
(3
)