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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]        
Intangible amortization expense $ 396 $ 366 $ 791 $ 731