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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of the period $ (76) $ (74) $ (63)  
Other comprehensive loss before reclassifications   (9) (21)  
Amounts reclassified from accumulated other comprehensive loss   7 10  
Other comprehensive loss   (2) (11) $ (3)
Balance at end of the period   (76) (74) (63)
Interest expense   163 170 164
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   86 85  
Total fair value   (1) 1  
Forecast | Designated as hedging instrument | Interest rate contract        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Interest expense 10      
Cash Flow Hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of the period (24) (31) (41)  
Other comprehensive loss before reclassifications   0 0  
Amounts reclassified from accumulated other comprehensive loss   7 10  
Other comprehensive loss   7 10  
Balance at end of the period   (24) (31) (41)
Foreign Currency Translation        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of the period (50) (41) (20)  
Other comprehensive loss before reclassifications   (9) (21)  
Amounts reclassified from accumulated other comprehensive loss   0 0  
Other comprehensive loss   (9) (21)  
Balance at end of the period   (50) (41) (20)
Other        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of the period $ (2) (2) (2)  
Other comprehensive loss before reclassifications   0 0  
Amounts reclassified from accumulated other comprehensive loss   0 0  
Other comprehensive loss   0 0  
Balance at end of the period   $ (2) $ (2) $ (2)