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Pension and Postretirement Plans | 6 Months Ended
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Mar. 31, 2018
Defined Benefit Plan [Abstract] |
Pension and Postretirement Plans | Pension and Postretirement Plans The components of the Company’s net periodic benefit costs from continuing operations associated with its defined benefit pension and postretirement plans are shown in the tables below in accordance with ASC 715, "Compensation – Retirement Benefits" (in millions):
| U.S. Pension Plans
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 3 |  |  | $ | 4 |  |  | $ | 7 |  |  | $ | 9 |
Interest cost | 27 |  |  | 29 |  |  | 53 |  |  | 57 |
Expected return on plan assets | (57 | ) |  | (58 | ) |  | (114 | ) |  | (117 | )
Net actuarial gain | — |  |  | (18 | ) |  | — |  |  | (135 | )
Settlement gain | — |  |  | (1 | ) |  | — |  |  | (9 | )
Net periodic benefit credit | $ | (27 | ) |  | $ | (44 | ) |  | $ | (54 | ) |  | $ | (195 | )
| Non-U.S. Pension Plans
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 6 |  |  | $ | 8 |  |  | $ | 12 |  |  | $ | 16 |
Interest cost | 15 |  |  | 11 |  |  | 29 |  |  | 23 |
Expected return on plan assets | (29 | ) |  | (22 | ) |  | (58 | ) |  | (45 | )
Net periodic benefit credit | $ | (8 | ) |  | $ | (3 | ) |  | $ | (17 | ) |  | $ | (6 | )
| Postretirement Benefits
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 1 |  |  | 2 |  |  | 3 |  |  | 3 |
Expected return on plan assets | (3 | ) |  | (2 | ) |  | (5 | ) |  | (5 | )
Net periodic benefit credit | $ | (1 | ) |  | $ | — |  |  | $ | (1 | ) |  | $ | (1 | )
During the three and six months ended March 31, 2017, the amount of lump sum payouts triggered a remeasurement event for certain U.S. pension plans resulting in the recognition of net actuarial gains of $18 million and $135 million, respectively.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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