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Segment Reporting - Schedule of Segment Information by Geography (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]                      
Revenues, less transaction-based expenses $ 1,298 $ 1,336 $ 1,298 $ 1,270 $ 1,308 $ 1,200 $ 1,246 $ 1,225 $ 5,202 $ 4,979 $ 4,638
Net assets 17,286       17,231       17,286 17,231  
Property and equipment, net 1,536               1,536    
Property and equipment, net         1,241         1,241  
United States                      
Segment Reporting Information [Line Items]                      
Revenues, less transaction-based expenses                 3,290 3,087 2,807
Net assets 9,038       9,226       9,038 9,226  
Property and equipment, net 1,353               1,353    
Property and equipment, net         1,125         1,125  
Foreign Countries                      
Segment Reporting Information [Line Items]                      
Revenues, less transaction-based expenses                 1,912 1,892 $ 1,831
Net assets 8,248       8,005       8,248 8,005  
Property and equipment, net $ 183               $ 183    
Property and equipment, net         $ 116         $ 116