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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 376 $ 424 $ 484
Other comprehensive income (loss), net of tax      
Foreign currency translation adjustment, net of tax 30 18 80
Derivatives: net investment hedges      
(Gains) losses reclassified to interest expense, net of tax (4) (4) (6)
(Gains) losses excluded from effectiveness testing and amortized to interest expense, net of tax 2 2 2
Pension and other postretirement benefit liability adjustments, net of tax (1) (9) 1
Other comprehensive income (loss), net of tax of $2, $14 and $1 27 7 77
Comprehensive income (loss) 403 431 561
Net income (loss) attributable to noncontrolling interests, net of tax 45 44 39
Foreign currency translation adjustment attributable to noncontrolling interests, net of tax 2 5  
Comprehensive income (loss) attributable to noncontrolling interests 47 49 39
Comprehensive income (loss) attributable to Cabot Corporation $ 356 $ 382 $ 522