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Business Segments (Geographic Data) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues $ 3,705 $ 3,403 $ 3,500
Property and equipment, net 362 323 292
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 2,659 2,408 2,524
Property and equipment, net 244 217 198
All other countries      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 1,046 995 976
Property and equipment, net $ 118 $ 106 $ 94