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Pensions and Other Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | Net periodic benefit cost for the Company’s defined benefit retirement plans and other benefit plans for the fiscal third quarters and fiscal nine months of 2018 and 2017 include the following components:
|  | Fiscal Third Quarters Ended |  | Fiscal Nine Months Ended
|  | Retirement Plans |  | Other Benefit Plans |  | Retirement Plans |  | Other Benefit Plans
(Dollars in Millions) |  | September 30, 2018 |  | October 1, 2017 |  | September 30, 2018 |  | October 1, 2017 |  | September 30, 2018 |  | October 1, 2017 |  | September 30, 2018 |  | October 1, 2017
Service cost |  | $ | 307 |  |  | 266 |  |  | 67 |  |  | 62 |  |  | 925 |  |  | 772 |  |  | 202 |  |  | 185 |
Interest cost |  | 247 |  |  | 232 |  |  | 37 |  |  | 40 |  |  | 748 |  |  | 693 |  |  | 112 |  |  | 119 |
Expected return on plan assets |  | (550 | ) |  | (514 | ) |  | (1 | ) |  | (2 | ) |  | (1,664 | ) |  | (1,528 | ) |  | (5 | ) |  | (5 | )
Amortization of prior service cost/(credit) |  | 1 |  |  | 1 |  |  | (7 | ) |  | (8 | ) |  | 2 |  |  | 2 |  |  | (23 | ) |  | (23 | )
Recognized actuarial losses |  | 213 |  |  | 154 |  |  | 31 |  |  | 34 |  |  | 641 |  |  | 456 |  |  | 92 |  |  | 103 |
Curtailments and settlements |  | — |  |  | 2 |  |  | — |  |  | — |  |  | (2 | ) |  | 1 |  |  | — |  |  | — |
Net periodic benefit cost |  | $ | 218 |  |  | 141 |  |  | 127 |  |  | 126 |  |  | 650 |  |  | 396 |  |  | 378 |  |  | 379 |

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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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