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Accumulated Other Comprehensive Income (Loss) ("AOCI") (Tables) | 3 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Changes in Each Component of AOCI, Net of Tax | Changes in each component of AOCI, net of tax, were as follows:
|  | Currency Translation Adjustment |  |  | Pension and Other Postretirement Benefit Liability Adjustments |  |  | Total |
|  | (In millions) |
Balance at September 30, 2023, attributable to Cabot Corporation |  | $ | (353 | ) |  | $ | (9 | ) |  | $ | (362 | )
Other comprehensive income (loss) before reclassifications |  |  | 62 |  |  |  | — |  |  |  | 62 |
Amounts reclassified from AOCI |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | 4 |  |  |  | — |  |  |  | 4 |
Balance at December 31, 2023, attributable to Cabot Corporation |  | $ | (296 | ) |  | $ | (9 | ) |  | $ | (305 | )
|  | Currency Translation Adjustment |  |  | Pension and Other Postretirement Benefit Liability Adjustments |  |  | Total |
|  | (In millions) |
Balance at September 30, 2022, attributable to Cabot Corporation |  | $ | (429 | ) |  | $ | (10 | ) |  | $ | (439 | )
Other comprehensive income (loss) before reclassifications |  |  | 88 |  |  |  | — |  |  |  | 88 |
Amounts reclassified from AOCI |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | 6 |  |  |  | — |  |  |  | 6 |
Balance at December 31, 2022, attributable to Cabot Corporation |  | $ | (348 | ) |  | $ | (10 | ) |  | $ | (358 | )

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