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Accumulated Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]  
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
The changes in the balances of each component of accumulated other comprehensive income (loss), net of tax, for the years ended December 31, 2017 and 2016 were as follows:
 
Foreign Currency Translation Adjustments1
 
Translation Adjustments on Net Investment Hedge
 
Defined Benefit Pension and Other Postretirement Plans2
 
Investment Securities Available-for-Sale3
 
Accumulated Other Comprehensive Income (Loss)
 
(in millions)
Balance at December 31, 2015
$
(663
)
 
$
(26
)
 
$
13

 
$
—

 
$
(676
)
Other comprehensive income (loss)
(286
)
 
38

 
(2
)
 
2

 
(248
)
Balance at December 31, 2016
(949
)
 
12

 
11

 
2

 
(924
)
Other comprehensive income (loss)
567

 
(153
)
 
14

 
(1
)
 
427

Balance at December 31, 2017
$
(382
)
 
$
(141
)
 
$
25

 
$
1

 
$
(497
)

1 During 2016, the increase in other comprehensive loss related to foreign currency translation adjustments was driven primarily by the devaluation of the British pound and euro. During 2017, the decrease in other comprehensive loss related to foreign currency translation adjustments was driven primarily by the appreciation of the euro.
2 During 2016, deferred gains related to the Company’s postretirement plans, reclassified from accumulated other comprehensive income (loss) to earnings, were $1 million before and after tax. During 2017, the decrease in other comprehensive loss related to the Company’s postretirement plan was driven by a tax deferred gain primarily related to a defined benefit pension plan, acquired as part of Vocalink. See Note 11 (Pension, Postretirement and Savings Plans) for additional information. In addition, deferred gains related to the Company’s postretirement plans, reclassified from accumulated other comprehensive income (loss) to earnings, were $2 million before tax and $1 million after tax.
3 During 2016 and 2017, gains and losses on available-for-sale investment securities, reclassified from accumulated other comprehensive income (loss) to investment income, were not significant.