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Derivative Instruments
12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Instruments
Derivative Instruments

Our exposure to market risk includes changes in foreign exchange rates. We have operations in foreign countries where the functional currency is primarily the local currency. For international operations that are determined to be extensions of the parent company, the U.S. dollar is the functional currency. We typically have naturally hedged positions in most countries from a local currency perspective with offsetting assets and liabilities. As of December 31, 2018 and December 31, 2017, we have entered into foreign exchange forward contracts to mitigate or hedge the effect of adverse fluctuations in foreign currency exchange rates. Foreign exchange forward contracts are recorded at fair value that is based on foreign currency exchange rates in active markets; therefore, we classify these derivative contracts within Level 2 of the fair value hierarchy. We do not enter into any derivative financial instruments for speculative purposes.

Undesignated Derivative Instruments

During the twelve months ended December 31, 2018 and 2017, we entered into foreign exchange forward contracts in order to mitigate the change in fair value of specific assets and liabilities in the consolidated balance sheet. These forward contracts do not qualify for hedge accounting. As of December 31, 2018 and 2017, the aggregate notional value of these outstanding forward contracts was $98 million and $130 million, respectively. The changes in fair value of these forward contracts are recorded in prepaid and other assets in the consolidated balance sheet with their corresponding change in fair value recognized into selling and general expenses in the consolidated statement of income. The amount recorded in selling and general expense for the twelve months ended December 31, 2018 and 2017 related to these contracts was a net loss of $12 million and a net gain of $3 million, respectively.

Cash Flow Hedges
During the twelve months ended December 31, 2018 and 2017, we entered into a series of foreign exchange forward contracts to hedge a portion of the Indian rupee, British pound, and Euro exposures through the fourth quarter of 2019 and 2018, respectively. During the twelve months ended December 31, 2016, we entered into a series of foreign exchange forward contracts to hedge a portion of the Indian Rupee exposure through the fourth quarter of 2016. These contracts are intended to offset the impact of movement of exchange rates on future revenue and operating costs and are scheduled to mature within twelve months. The changes in the fair value of these contracts are initially reported in accumulated other comprehensive loss in our consolidated balance sheet and are subsequently reclassified into revenue and selling and general expenses in the same period that the hedged transaction affects earnings.
As of December 31, 2018, we estimate that $4 million of the net gains related to derivatives designated as cash flow hedges recorded in other comprehensive income is expected to be reclassified into earnings within the next twelve months. There was no material hedge ineffectiveness for the year ended December 31, 2018.
As of December 31, 2018 and December 31, 2017, the aggregate notional value of our outstanding foreign exchange forward contracts designated as cash flow hedges was $289 million and $307 million, respectively.
The following table provides information on the location and fair value amounts of our cash flow hedges as of December 31, 2018 and December 31, 2017:

(in millions)
 
December 31,
 
December 31,
Balance Sheet Location
 
2018
 
2017
Derivatives designated as cash flow hedges:
 
 
 
 
Prepaid and other current assets
Foreign exchange forward contracts
$
3

 
$
3



The following table provides information on the location and amounts of pre-tax gains (losses) on our cash flow hedges for the years ended December 31:
(in millions)
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss (effective portion)
 
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (effective portion)
 
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (effective portion)
Cash flow hedges - designated as hedging instruments
2018
 
2017
 
2016
 
 
 
2018
 
2017
 
2016
Foreign exchange forward contracts
$
2

 
$

 
$
3

 
Revenue, Selling and general expenses
 
$
(4
)
 
$
9

 
$
4



The activity related to the change in unrealized gains (losses) in accumulated other comprehensive loss was as follows for the years ended December 31:
(in millions)
Year ended December 31,
 
2018
 
2017
 
2016
Net unrealized gains (losses) on cash flow hedges, net of taxes, beginning of year
$
2

 
$
2

 
$
(1
)
Change in fair value, net of tax
(2
)
 
9

 
7

Reclassification into earnings, net of tax
4

 
(9
)
 
(4
)
Net unrealized gains on cash flow hedges, net of taxes, end of year
$
4

 
$
2

 
$
2