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Segment Data - Revenues to Unaffiliated Customers and Long-lived Assets Including Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 21,840 $ 20,178 $ 19,372
Long-Lived Assets 46,070 46,818 44,104
Corporate and All Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 0 (67) 0
Long-Lived Assets 500 459 418
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 12,790 11,663 11,113
Long-Lived Assets 34,778 35,526 35,732
United States | Corporate and All Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 0 (6) 0
EMEA      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 4,729 4,402 4,244
Long-Lived Assets 6,759 6,706 5,317
Greater Asia      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 3,093 2,906 2,913
Long-Lived Assets 1,586 1,580 1,521
Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 1,227 1,207 1,102
Long-Lived Assets $ 2,447 $ 2,548 $ 1,116