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Accumulated Other Comprehensive Income (Loss) - Changes in Each Component of AOCI, Net of Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance $ 1,407 $ 1,032
Ending Balance 1,590 1,407
Currency Translation Adjustment [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance (353) (429)
Other comprehensive income (loss) before reclassifications 18 80
Amounts reclassified from AOCI (2) (4)
Less: Other comprehensive income (loss) attributable to noncontrolling interests 5  
Ending Balance (342) (353)
Pension and Other Postretirement Benefit Liability Adjustment [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance (9) (10)
Other comprehensive income (loss) before reclassifications (5) 3
Amounts reclassified from AOCI (4) (2)
Ending Balance (18) (9)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance (362) (439)
Other comprehensive income (loss) before reclassifications 13 83
Amounts reclassified from AOCI (6) (6)
Less: Other comprehensive income (loss) attributable to noncontrolling interests 5  
Ending Balance $ (360) $ (362)