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Description of Business and Significant Accounting Policies - Impact of the Adoption of Topic 606 on the Condensed Consolidated Income Statements and Balance Sheets (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Assets                        
Cash and cash equivalents $ 228       $ 336       $ 228 $ 336    
Restricted cash, cash equivalents and investments 942       1,280       942 1,280    
Unbilled revenues, net 304       297       304 297    
Prepaid expenses 48               48      
Other current assets 59               59      
Other assets 78       55       78 55    
Liabilities                        
Accounts payable and other current liabilities 45               45      
Deferred taxes 68       68       68 68    
Other non-current liabilities 18       14       18 14    
Equity                        
Accumulated deficit (266)       (377)       (266) (377)    
Revenue                        
Revenues                 3,503 3,275 $ 3,060  
Expense                        
Sales and marketing                 182 187 174  
Commissions expense                 22      
Total expense                 3,252 3,058 2,936  
Income before provision for income taxes                 241 200 104  
Income tax expense                 49 22 43  
Net income $ 29 $ 51 $ 58 $ 54 $ 66 $ 43 $ 40 $ 29 $ 192 $ 178 $ 61  
Basic net income per share (in dollars per share) $ 0.41 $ 0.73 $ 0.82 $ 0.77 $ 0.95 $ 0.62 $ 0.58 $ 0.42 $ 2.72 $ 2.57 $ 0.88  
Diluted net income per share (in dollars per share) $ 0.40 $ 0.71 $ 0.80 $ 0.75 $ 0.92 $ 0.60 $ 0.56 $ 0.41 $ 2.65 $ 2.49 $ 0.85  
Balance Using Previous Standard                        
Assets                        
Cash and cash equivalents $ 235               $ 235      
Restricted cash, cash equivalents and investments 935               935      
Unbilled revenues, net 311               311      
Prepaid expenses 44               44      
Other current assets 49               49      
Other assets 67               67      
Liabilities                        
Accounts payable and other current liabilities 48               48      
Deferred taxes 67               67      
Other non-current liabilities 22               22      
Equity                        
Accumulated deficit (290)               (290)      
Revenue                        
Revenues                 3,501      
Expense                        
Commissions expense                 53      
Total expense                 3,283      
Income before provision for income taxes                 208      
Income tax expense                 40      
Net income                 $ 168      
Basic net income per share (in dollars per share)                 $ 2.40      
Diluted net income per share (in dollars per share)                 $ 2.34      
Increase (Decrease) | ASU 2014-09                        
Assets                        
Cash and cash equivalents (7)               $ (7)      
Restricted cash, cash equivalents and investments 7               7      
Unbilled revenues, net (7)               (7)      
Prepaid expenses 4               4      
Other current assets 10               10      
Other assets 11               11      
Liabilities                        
Accounts payable and other current liabilities 3               3      
Deferred taxes (1)               (1)      
Other non-current liabilities 4               4      
Equity                        
Accumulated deficit $ (24)               (24)     $ 2
Revenue                        
Revenues                 2      
Expense                        
Commissions expense                 (31)      
Total expense                 (31)      
Income before provision for income taxes                 33      
Income tax expense                 9      
Net income                 $ 24      
Basic net income per share (in dollars per share)                 $ 0.32      
Diluted net income per share (in dollars per share)                 $ 0.31      
Professional service revenues                        
Revenue                        
Revenues                 $ 487 $ 458 $ 447  
Professional service revenues | Balance Using Previous Standard                        
Revenue                        
Revenues                 485      
Professional service revenues | Increase (Decrease) | ASU 2014-09                        
Revenue                        
Revenues                 $ 2