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Summary of Significant Accounting Policies - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 22, 2017
USD ($)
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Significant Accounting Policies [Line Items]          
Number of operating segments | segment   2      
Useful life   17 years 1 month 6 days      
Deferred tax benefit relating to tax cuts and jobs act $ 764     $ 764  
Percentage of high quality sovereign debt of reverse repurchase   2.00%      
Banker success fee     $ 5    
Foreign currency translation adjustments   $ 177 227    
Foreign currency transaction loss   5 2 4  
Net periodic (expense) benefit   $ 0 (1) 15  
Impact of adoption of ASU 2018-02 to reclassify items stranded in other comprehensive income     0    
Weighted average remaining lease term for operating lease   6 years 8 months 12 days      
Weighted average discount rate (percent)   3.50%      
Total operating lease liability   $ 334     $ 368
Current operating lease liability   53     53
Non-current operating lease liability   281 0   315
Right-of-use lease assets   287     317
Accounting Standards Update 2016-02          
Significant Accounting Policies [Line Items]          
Total operating lease liability         368
Current operating lease liability         53
Non-current operating lease liability         315
Right-of-use lease assets         317
Deferred rent         51
Accounting Standards Update 2017-07          
Significant Accounting Policies [Line Items]          
Net periodic (expense) benefit     (8) 9  
Rent And Occupancy Expense          
Significant Accounting Policies [Line Items]          
Operating lease expense   41      
Operating lease expense     38 39  
Technology And Communication Expense          
Significant Accounting Policies [Line Items]          
Operating lease expense   $ 21      
Operating lease expense     21 $ 19  
Other Current Liabilities | Accounting Standards Update 2016-02          
Significant Accounting Policies [Line Items]          
Deferred rent         2
Other Noncurrent Liabilities | Accounting Standards Update 2016-02          
Significant Accounting Policies [Line Items]          
Deferred rent         $ 49
Software Development          
Significant Accounting Policies [Line Items]          
Useful life   3 years      
Software and Software Development Costs          
Significant Accounting Policies [Line Items]          
Useful life   7 years      
Employee stock          
Significant Accounting Policies [Line Items]          
Percentage of purchase price of common stock   85.00%      
Discount from market price   15.00%      
Retained Earnings          
Significant Accounting Policies [Line Items]          
Impact of adoption of ASU 2018-02 to reclassify items stranded in other comprehensive income     $ 26