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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
3 Months Ended
Oct. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Finite And Indefinite Lived Intangible Assets [Line Items]      
Goodwill deductible for income tax purposes   $ 31,000,000  
Goodwill, impairment loss   0  
Impairment of intangible assets   0  
Amortization expense, intangible assets   102,000,000 $ 107,000,000
Amortization expense, computer software   65,000,000 $ 69,000,000
Purchased Software      
Finite And Indefinite Lived Intangible Assets [Line Items]      
Net book value   14,000,000  
Internally Developed Software      
Finite And Indefinite Lived Intangible Assets [Line Items]      
Net book value   $ 639,000,000  
Connect | Advent | Trade names and trademarks      
Finite And Indefinite Lived Intangible Assets [Line Items]      
Intangible assets license period 20 years    
Measurement Input, Discount Rate      
Finite And Indefinite Lived Intangible Assets [Line Items]      
Discount rate   10.10%