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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Mar. 31, 2016
Equity [Abstract] |
Changes in Each Component of AOCI, Net of Tax | Changes in each component of AOCI, net of tax, are as follows:
|  | Currency Translation Adjustment |  |  | Unrealized Gains on Investments |  |  | Pension and Other Postretirement Benefit Liability Adjustments |  |  | Total |
|  | (Dollars in millions) |
Balance at September 30, 2015, attributable to Cabot Corporation |  | $ | (239 | ) |  | $ | 2 |  |  | $ | (62 | ) |  | $ | (299 | )
Other comprehensive income (loss) before reclassifications |  |  | (47 | ) |  |  | — |  |  |  | — |  |  |  | (47 | )
Amounts reclassified from accumulated other comprehensive (loss) income |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | (1 | )
Net other comprehensive items |  |  | (286 | ) |  |  | 2 |  |  |  | (63 | ) |  |  | (347 | )
Less: Noncontrolling interest |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | (3 | )
Balance at December 31, 2015, attributable to Cabot Corporation |  | $ | (283 | ) |  | $ | 2 |  |  | $ | (63 | ) |  | $ | (344 | )
Other comprehensive income (loss) before reclassifications |  |  | 65 |  |  |  | — |  |  |  | — |  |  |  | 65 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | 1 |
Net other comprehensive items |  |  | (218 | ) |  |  | 2 |  |  |  | (62 | ) |  |  | (278 | )
Less: Noncontrolling interest |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 1 |
Balance at March 31, 2016, attributable to Cabot Corporation |  | $ | (219 | ) |  | $ | 2 |  |  | $ | (62 | ) |  | $ | (279 | )
Amounts Reclassified Out of AOCI | The amounts reclassified out of AOCI and into the Consolidated Statements of Operations in the three months and six months ended March 31, 2016 and 2015 are as follows:
|  |  |  | Three Months Ended |  |  | Six Months Ended |
|  | Affected Line Item in the Consolidated |  | March 31, |  |  | March 31, |
|  | Statements of Operations |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
|  |  |  | (Dollars in millions) |
Pension and other postretirement benefit liability adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of actuarial losses |  | Net Periodic Benefit Cost - see Note C for details |  | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |
Amortization of prior service cost |  | Net Periodic Benefit Cost - see Note C for details |  |  | (1 | ) |  |  | — |  |  |  | (2 | ) |  |  | (1 | )
Settlement and curtailment (credit) cost |  | Net Periodic Benefit Cost - see Note C for details |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | 27 |
Total before tax |  |  |  |  | — |  |  |  | 1 |  |  |  | (1 | ) |  |  | 28 |
Tax impact |  | Benefit (provision) for income taxes |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | (6 | )
Total after tax |  |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 22 |

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- Definition Change in accumulated other comprehensive income loss. + 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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