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Property and Equipment (Schedule of Property and Equipment) (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Property Plant And Equipment [Abstract]    
Land $ 24 $ 24
Buildings 185 181
Leasehold improvements 70 69
Furniture and equipment 215 216
Capitalized software 884 792
Property and equipment, Gross 1,378 1,282
Accumulated depreciation and amortization (872) (837)
Property and equipment, Total $ 506 $ 445