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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period $ 2,293 $ 2,731 $ 2,541 $ 2,660
Total other comprehensive (loss) income   (13) 22 (2)
Balance at end of period   2,293 2,731 2,541
Interest expense   193 176 163
Cash flow hedge loss to be recognized in cost of processing and services during the next 12 months   1    
Designated as hedging instrument | Foreign currency forward exchange contracts | Indian Rupee        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Notional amount   202 150  
Total fair value     (8)  
Forecast | Designated as hedging instrument | Interest rate contract        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Interest expense 6      
Cash Flow Hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (16) (14) (24)  
Other comprehensive loss before reclassifications   (5) 4  
Amounts reclassified from accumulated other comprehensive loss   3 6  
Total other comprehensive (loss) income   (2) 10  
Balance at end of period   (16) (14) (24)
Foreign Currency Translation        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (49) (38) (50)  
Other comprehensive loss before reclassifications   (11) 12  
Amounts reclassified from accumulated other comprehensive loss   0 0  
Total other comprehensive (loss) income   (11) 12  
Balance at end of period   (49) (38) (50)
Other        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (2) (2) (2)  
Other comprehensive loss before reclassifications   0 0  
Amounts reclassified from accumulated other comprehensive loss   0 0  
Total other comprehensive (loss) income   0 0  
Balance at end of period   (2) (2) (2)
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period $ (67) (54) (76) (74)
Other comprehensive loss before reclassifications   (16) 16  
Amounts reclassified from accumulated other comprehensive loss   3 6  
Total other comprehensive (loss) income   (13) 22 (2)
Balance at end of period   $ (67) (54) $ (76)
Accounting Standards Update 2017-12 | New Accounting Pronouncement, Early Adoption, Effect | Cash Flow Hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Cumulative effect of new accounting principle     3  
Accounting Standards Update 2017-12 | New Accounting Pronouncement, Early Adoption, Effect | Foreign Currency Translation        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Cumulative effect of new accounting principle     0  
Accounting Standards Update 2017-12 | New Accounting Pronouncement, Early Adoption, Effect | Other        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Cumulative effect of new accounting principle     0  
Accounting Standards Update 2017-12 | New Accounting Pronouncement, Early Adoption, Effect | Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Cumulative effect of new accounting principle     3  
Accounting Standards Update 2018-02 | New Accounting Pronouncement, Early Adoption, Effect | Cash Flow Hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Cumulative effect of new accounting principle     (3)  
Accounting Standards Update 2018-02 | New Accounting Pronouncement, Early Adoption, Effect | Foreign Currency Translation        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Cumulative effect of new accounting principle     0  
Accounting Standards Update 2018-02 | New Accounting Pronouncement, Early Adoption, Effect | Other        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Cumulative effect of new accounting principle     0  
Accounting Standards Update 2018-02 | New Accounting Pronouncement, Early Adoption, Effect | Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Cumulative effect of new accounting principle     $ (3)