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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 424 $ 484 $ 243
Other comprehensive income (loss), net of tax      
Foreign currency translation adjustment, net of tax 18 80 (175)
Derivatives: net investment hedges      
(Gains) losses reclassified to interest expense, net of tax (4) (6) (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 (9) 1 14
Other comprehensive income (loss), net of tax of $14, $1 and $3 7 77 (165)
Comprehensive income (loss) 431 561 78
Net Income (Loss) Attributable to Noncontrolling Interest 44 39 34
Foreign currency translation adjustment attributable to noncontrolling interests, net of tax 5   (15)
Comprehensive income (loss) attributable to noncontrolling interests 49 39 19
Comprehensive income (loss) attributable to Cabot Corporation $ 382 $ 522 $ 59