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Share-Based Compensation - Narrative (Details)
$ in Millions
 1 Months Ended 12 Months Ended
May 31, 2018
period
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Feb. 28, 2019
shares
Class of Stock [Line Items]          
Non-cash compensation expense | $   $ 139 $ 130 $ 135  
Allocation of recognized period costs, capitalized amount | $   $ 14 15 $ 18  
Capital shares reserved for future issuance (in shares)   34,200,000      
Time Based And Performance Based Restricted Stock          
Class of Stock [Line Items]          
Compensation cost not yet recognized | $   $ 106      
Cost not yet recognized, period for recognition   1 year 1 month 6 days      
Time Based Restricted Units          
Class of Stock [Line Items]          
Typical vesting period   3 years      
Performance Based Restricted Stock Units          
Class of Stock [Line Items]          
Typical vesting period   3 years      
Grants in period (in shares)   500,000      
Stock granted, value, net of forfeitures | $   $ 39      
Amount of non-cash compensation remaining in fiscal period | $   $ 20      
Employee stock option          
Class of Stock [Line Items]          
Award vesting period   3 years      
Awards exercise period   10 years      
Compensation cost not yet recognized | $   $ 8      
Cost not yet recognized, period for recognition   1 year 4 months 24 days      
Employee stock option | Minimum          
Class of Stock [Line Items]          
Stock options granted, expiration period   14 days      
Employee stock option | Maximum          
Class of Stock [Line Items]          
Stock options granted, expiration period   60 days      
Employee stock          
Class of Stock [Line Items]          
Number of shares authorized (up to) (in shares) 25,000,000        
Percentage in increment of eligible pay 1.00%        
Percentage of maximum contribution of eligible pay 25.00%        
Maximum number of shares per employee (in shares) 25,000        
Shares employees are eligible for in each offering period (in shares) 1,250        
Number of offering periods per year | period 2        
Percentage of purchase price of common stock   85.00%      
Stock-based compensation | $   $ 7 $ 4    
Discount from market price   15.00%      
Restricted Stock          
Class of Stock [Line Items]          
Grants in period (in shares)   1,697,000 1,994,000 3,274,000  
Restricted Stock | Time Based Restricted Units          
Class of Stock [Line Items]          
Grants in period (in shares)   997,000 1,153,000 2,364,000  
Restricted Stock | Maximum | Performance Based Restricted Stock Units          
Class of Stock [Line Items]          
Shares reserved for future issuance (in shares)         1,100,000
Bakkt, LLC          
Class of Stock [Line Items]          
Preferred units, issued   82,000,000      
Common units, issued   4,000,000      
Phantom incentive units, issued   9,000,000