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Business Segments (Geographic Data) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues $ 6,226 $ 5,886 $ 5,625
Property and equipment, net 532 509 475
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 5,100 4,822 4,662
Property and equipment, net 344 325 311
All other countries      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 1,126 1,064 963
Property and equipment, net $ 188 $ 184 $ 164