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Pension and Other Postretirement Benefit Plans | 9 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Pension and Other Postretirement Benefits Plans | PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS The components of the net periodic cost for the pension and postretirement benefit plans for the three and nine months ended June 30, 2018, and July 1, 2017, are as follows (in millions):
| Pension Plans
| Three Months Ended |  | Nine Months Ended
| June 30, 2018 |  | July 1, 2017 |  | June 30, 2018 |  | July 1, 2017
Service cost | $ | 1 |  |  | $ | 4 |  |  | $ | 5 |  |  | $ | 10 |
Interest cost | 16 |  |  | 16 |  |  | 48 |  |  | 48 |
Expected return on plan assets | (16 | ) |  | (15 | ) |  | (47 | ) |  | (44 | )
Amortization of: |  |  |  |  |  |  |
Net actuarial loss | 1 |  |  | 1 |  |  | 3 |  |  | 5 |
Settlement (gain) loss | — |  |  | — |  |  | — |  |  | 2 |
Net periodic cost | $ | 2 |  |  | $ | 6 |  |  | $ | 9 |  |  | $ | 21 |
| Postretirement Benefit Plans
| Three Months Ended |  | Nine Months Ended
| June 30, 2018 |  | July 1, 2017 |  | June 30, 2018 |  | July 1, 2017
Interest cost | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |
Amortization of: |  |  |  |  |  |  |
Prior service credit | (6 | ) |  | (6 | ) |  | (18 | ) |  | (18 | )
Net periodic cost (credit) | $ | (6 | ) |  | $ | (6 | ) |  | $ | (17 | ) |  | $ | (17 | )
We made lump-sum settlement payments of $4 million and $5 million for the nine months ended June 30, 2018 and July 1, 2017, respectively, to certain deferred vested participants within our respective non-qualified and qualified pension plans. We contributed $9 million to our pension plans for the three months ended June 30, 2018 and July 1, 2017. We contributed $27 million and $31 million to our pension plans for the nine months ended June 30, 2018, and July 1, 2017, respectively. We expect to contribute an additional $2 million during the remainder of fiscal 2018. The amount of contributions made to pension plans in any year is dependent upon a number of factors, including minimum funding requirements in the jurisdictions in which we operate. As a result, the actual funding in fiscal 2018 may differ from the current estimate.

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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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