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Estimated Future Amortization Expense on Technology Placed in Service (Detail)
$ in Millions
Sep. 30, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2019 $ 56
2020 56
2021 56
2022 50
2023 28
thereafter 44
Total 290
Technology and Software  
Finite-Lived Intangible Assets [Line Items]  
2019 309
2020 257
2021 195
2022 128
2023 69
thereafter 32
Total $ 990