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Shared-Based Compensation - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2020
Feb. 29, 2020
Mar. 31, 2020
Mar. 31, 2019
Class of Stock [Line Items]        
Non-cash expense recognized     $ 30 $ 29
Acquisition costs     $ 12 $ 0
Time Based Restricted Units        
Class of Stock [Line Items]        
Cost not yet recognized, period for recognition     3 years  
Performance Based Restricted Stock Units        
Class of Stock [Line Items]        
Unrecognized compensation expense $ 49 $ 41 $ 49  
Cost not yet recognized, period for recognition   3 years    
Vested stock options (in shares)   0.5    
Stock-based compensation     5  
Amount of non-cash compensation remaining in fiscal period 24   24  
Time Based And Performance Based Restricted Stock        
Class of Stock [Line Items]        
Unrecognized compensation expense 184   $ 184  
Cost not yet recognized, period for recognition     1 year 10 months 24 days  
Maximum | Performance Based Restricted Stock Units        
Class of Stock [Line Items]        
Unrecognized compensation expense   $ 82    
Shares reserved for future issuance (in shares)   0.9    
Employee Stock Option        
Class of Stock [Line Items]        
Unrecognized compensation expense 13   $ 13  
Cost not yet recognized, period for recognition     2 years 1 month 6 days  
Bridge2 Solutions        
Class of Stock [Line Items]        
Acquisition costs     $ 10  
Bridge2 Solutions | Bakkt        
Class of Stock [Line Items]        
Capital call amount $ 300