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Shared-Based Compensation - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 29, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Class of Stock [Line Items]          
Non-cash expense recognized   $ 31 $ 35 $ 61 $ 64
Acquisition costs   2 $ 1 $ 14 $ 1
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 $ 41 41   $ 41  
Cost not yet recognized, period for recognition 3 years        
Vested stock options (in shares) 0.5        
Stock-based compensation   8   13  
Amount of non-cash compensation remaining in fiscal period   16   16  
Time Based And Performance Based Restricted Stock          
Class of Stock [Line Items]          
Unrecognized compensation expense   163   $ 163  
Cost not yet recognized, period for recognition       1 year 7 months 6 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   $ 11   $ 11  
Cost not yet recognized, period for recognition       1 year 10 months 24 days  
Bridge2 Solutions          
Class of Stock [Line Items]          
Acquisition costs       $ 10  
Bridge2 Solutions | Bakkt          
Class of Stock [Line Items]          
Capital call amount       $ 300