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Pension and Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The components of the net periodic cost for the pension and postretirement benefit plans for the three and six months ended March 31, 2018, and April 1, 2017, are as follows (in millions):
| Pension Plans
| Three Months Ended |  | Six Months Ended
| March 31, 2018 |  | April 1, 2017 |  | March 31, 2018 |  | April 1, 2017
Service cost | $ | 2 |  |  | $ | 3 |  |  | $ | 4 |  |  | $ | 6 |
Interest cost | 16 |  |  | 16 |  |  | 32 |  |  | 32 |
Expected return on plan assets | (15 | ) |  | (14 | ) |  | (31 | ) |  | (29 | )
Amortization of: |  |  |  |  |  |  |
Net actuarial loss | 1 |  |  | 2 |  |  | 2 |  |  | 4 |
Settlement (gain) loss | — |  |  | 2 |  |  | — |  |  | 2 |
Net periodic cost | $ | 4 |  |  | $ | 9 |  |  | $ | 7 |  |  | $ | 15 |
| Postretirement Benefit Plans
| Three Months Ended |  | Six Months Ended
| March 31, 2018 |  | April 1, 2017 |  | March 31, 2018 |  | April 1, 2017
Interest cost | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Amortization of: |  |  |  |  |  |  |
Prior service credit | (6 | ) |  | (6 | ) |  | (12 | ) |  | (12 | )
Net periodic cost (credit) | $ | (5 | ) |  | $ | (5 | ) |  | $ | (11 | ) |  | $ | (11 | )

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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