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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Jun. 30, 2018
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 |  |  | Unrealized Gains on Investments |  |  | Pension and Other Postretirement Benefit Liability Adjustments |  |  | Total |
|  | (In millions) |
Balance at September 30, 2017, attributable to Cabot Corporation |  | $ | (204 | ) |  | $ | 2 |  |  | $ | (57 | ) |  | $ | (259 | )
Other comprehensive income (loss) before reclassifications |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amounts reclassified from AOCI |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | (1 | )
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | 3 |  |  |  | — |  |  |  | — |  |  |  | 3 |
Balance at December 31, 2017, attributable to Cabot Corporation |  |  | (208 | ) |  |  | 2 |  |  |  | (57 | ) |  |  | (263 | )
Other comprehensive income (loss) before reclassifications |  |  | 59 |  |  |  | — |  |  |  | — |  |  |  | 59 |
Amounts reclassified from AOCI |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | (1 | )
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | 4 |  |  |  | — |  |  |  | — |  |  |  | 4 |
Balance at March 31, 2018, attributable to Cabot Corporation |  |  | (154 | ) |  |  | 2 |  |  |  | (57 | ) |  |  | (209 | )
Other comprehensive income (loss) before reclassifications |  |  | (109 | ) |  |  | (1 | ) |  |  | — |  |  |  | (110 | )
Amounts reclassified from AOCI |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | (1 | )
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | (7 | ) |  |  | — |  |  |  | — |  |  |  | (7 | )
Balance at June 30, 2018, attributable to Cabot Corporation |  | $ | (257 | ) |  | $ | 1 |  |  | $ | (57 | ) |  | $ | (313 | )
Amounts Reclassified Out of AOCI | The amounts reclassified out of AOCI and into the Consolidated Statements of Operations in the three and nine months ended June 30, 2018 and 2017 were as follows:
|  | Affected Line Item in the Consolidated |  | Three Months Ended June 30 |  |  | Nine Months Ended June 30 |
|  | Statements of Operations |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
|  |  |  | (In millions) |
Derivatives: net investment hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Gains) losses reclassified to interest expense |  | Interest expense |  | $ | (2 | ) |  | $ | — |  |  | $ | (4 | ) |  | $ | — |
Pension and other postretirement benefit liability adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of actuarial losses |  | Net Periodic Benefit Cost - see Note D for details |  |  | 1 |  |  |  | 1 |  |  |  | 2 |  |  |  | 4 |
Amortization of prior service credit |  | Net Periodic Benefit Cost - see Note D for details |  |  | (1 | ) |  |  | (1 | ) |  |  | (2 | ) |  |  | (2 | )
Total before tax |  |  |  |  | (2 | ) |  |  | — |  |  |  | (4 | ) |  |  | 2 |
Tax impact |  | Provision (benefit) for income taxes |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | — |
Total after tax |  |  |  | $ | (1 | ) |  | $ | — |  |  | $ | (3 | ) |  | $ | 2 |

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- Definition Change in accumulated other comprehensive income loss. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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