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Employee Benefit Plans | 9 Months Ended
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Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract] |
Employee Benefit Plans | D. Employee Benefit Plans Net periodic defined benefit pension and other postretirement benefit costs include the following:
|  | Three Months Ended June 30 |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
|  | Pension Benefits |  |  | Postretirement Benefits |
|  | U.S. |  |  | Foreign |  |  | U.S. |  |  | Foreign |  |  | U.S. |  |  | Foreign |  |  | U.S. |  |  | Foreign |
|  | (In millions) |
Service cost |  | $ | 1 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 1 |  |  |  | 2 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | — |
Expected return on plan assets |  |  | (3 | ) |  |  | (4 | ) |  |  | (3 | ) |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of prior service credit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |
Amortization of actuarial loss |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net periodic benefit (credit) cost |  | $ | (1 | ) |  | $ | 1 |  |  | $ | (1 | ) |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
|  | Nine Months Ended June 30 |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
|  | Pension Benefits |  |  | Postretirement Benefits |
|  | U.S. |  |  | Foreign |  |  | U.S. |  |  | Foreign |  |  | U.S. |  |  | Foreign |  |  | U.S. |  |  | Foreign |
|  | (In millions) |
Service cost |  | $ | 1 |  |  | $ | 6 |  |  | $ | 1 |  |  | $ | 7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 3 |  |  |  | 6 |  |  |  | 3 |  |  |  | 4 |  |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | — |
Expected return on plan assets |  |  | (8 | ) |  |  | (11 | ) |  |  | (8 | ) |  |  | (10 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of prior service credit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2 | ) |  |  | — |  |  |  | (2 | ) |  |  | — |
Amortization of actuarial loss |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 4 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net periodic benefit (credit) cost |  | $ | (4 | ) |  | $ | 3 |  |  | $ | (4 | ) |  | $ | 5 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | (1 | ) |  | $ | — |

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- References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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