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Property, Equipment and Technology, Net - Estimated Future Amortization Expense on Technology Placed in Service (Detail)
$ in Millions
Sep. 30, 2019
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2020 $ 79
2021 79
2022 73
2023 51
2024 49
Thereafter 146
Total 477
Technology and Software  
Finite-Lived Intangible Assets [Line Items]  
2020 355
2021 297
2022 226
2023 145
2024 70
Thereafter 24
Total $ 1,117