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Shared-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Class of Stock [Line Items]          
Non-cash expense recognized   $ 36 $ 32 $ 100 $ 93
Fair value of restricted stock       166 201
Performance Based Restricted Stock Units          
Class of Stock [Line Items]          
Unrecognized compensation expense $ 41 26   26  
Cost not yet recognized, period for recognition 3 years        
Vested stock options (in shares) 600,000        
Stock-based compensation   6   15  
Amount of non-cash compensation remaining in fiscal period   7   $ 7  
Time Based Restricted Units          
Class of Stock [Line Items]          
Vested stock options (in shares)       1,000,000  
Time Based And Performance Based Restricted Stock          
Class of Stock [Line Items]          
Unrecognized compensation expense   137   $ 137  
Cost not yet recognized, period for recognition       1 year 4 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) 1,100,000        
Employee Stock Option          
Class of Stock [Line Items]          
Intrinsic value of shares   7 $ 6 $ 25 $ 25
Unrecognized compensation expense   10   $ 10  
Cost not yet recognized, period for recognition       1 year 7 months 6 days  
Bakkt          
Class of Stock [Line Items]          
Unrecognized compensation expense   $ 46   $ 46  
Cost not yet recognized, period for recognition       8 years  
Preferred units, issued   101,000,000   101,000,000  
Common units, issued   4,000,000   4,000,000  
Phantom incentive units, issued   8,000,000   8,000,000