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Commitments and Contingencies - Narrative (Details)
€ in Millions, $ in Millions
1 Months Ended 2 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
Jan. 31, 2020
EUR (€)
Feb. 27, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
French Tax Authority            
Loss Contingencies [Line Items]            
Total assessment, including penalties and interest, not recorded         $ 638 € 571
Tax expense (benefit) related to tax settlement       $ 54    
Subsequent Events            
Loss Contingencies [Line Items]            
Future minimum commitments     $ 600      
Subsequent Events | French Tax Authority            
Loss Contingencies [Line Items]            
Tax payments, including interest and penalties $ 179 € 161        
Subsequent Events | Minimum            
Loss Contingencies [Line Items]            
Future minimum commitments, period     3 years      
Subsequent Events | Maximum            
Loss Contingencies [Line Items]            
Future minimum commitments, period     4 years      
Subsequent Events | Marketing            
Loss Contingencies [Line Items]            
Future minimum commitments, percentage     60.00%      
Subsequent Events | Developer and Hosting            
Loss Contingencies [Line Items]            
Future minimum commitments, percentage     40.00%      
Credit Agreement as Amended            
Loss Contingencies [Line Items]            
Amount of letters of credit that can be issued under the Revolver       $ 50