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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Summary of Changes in Accumulated Other Comprehensive Loss
The following table presents changes in accumulated other comprehensive income (loss) balances.
Year Ended December 31,
2016
 
2015
 
2014
 
(in millions)
Unrealized gains (losses) on cash flow hedging instruments:
 
 
 
 
 
Balance at beginning of period
$
(15
)
 
$
(52
)
 
$
(97
)
Other comprehensive income for period:
 
 
 
 
 
Net gains arising during period, net of tax of $6 million, $16 million and $20 million, respectively
11

 
29

 
38

Reclassification adjustment for losses realized in net income, net of tax of $3 million, $5 million and $4 million, respectively(1)
4

 
8

 
7

Total other comprehensive income for period
15

 
37

 
45

Balance at end of period
—

 
(15
)
 
(52
)
Pension and postretirement benefit plan liability:
 
 
 
 
 
Balance at beginning of period
29

 
(13
)
 
(11
)
Other comprehensive income (loss) for period:
 
 
 
 
 
Change in unfunded pension and postretirement liability, net of tax of $(1) million, $26 million and $(4) million, respectively
(1
)
 
43

 
(3
)
Reclassification adjustment for (gains) losses realized in net income, net of tax of $(1) million, $(1) million and $2 million, respectively(2)
(4
)
 
(1
)
 
1

Total other comprehensive income (loss) for period
(5
)
 
42

 
(2
)
Balance at end of period
24

 
29

 
(13
)
Total accumulated other comprehensive income (loss) at end of period
$
24

 
$
14

 
$
(65
)
 
(1) 
The amounts reclassified relate to currency swaps and are included as a component of interest expense in our consolidated statement of income (loss).
(2) 
The amounts reclassified are included as a component of salaries and employee benefits in our consolidated statement of income (loss).