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Retirement Plans (Tables) | 9 Months Ended
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Sep. 30, 2017
Retirement Plans |
Components of net periodic benefit cost (credit) |
|  | Three Months Ended | Nine Months Ended
(In millions) |  | September 30, 2017 | October 1, 2016 | September 30, 2017 | October 1, 2016
Pension Benefits |  |  |  |  |  |  |  |  |
Service cost |  | $ | 25 | $ | 25 | $ | 75 | $ | 74
Interest cost |  |  | 81 |  | 84 |  | 242 |  | 254
Expected return on plan assets |  |  | (127) |  | (123) |  | (380) |  | (368)
Amortization of net actuarial loss |  |  | 34 |  | 26 |  | 102 |  | 78
Amortization of prior service cost |  |  | 4 |  | 4 |  | 12 |  | 11
Net periodic benefit cost |  | $ | 17 | $ | 16 | $ | 51 | $ | 49
Postretirement Benefits Other Than Pensions |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1 | $ | 1 | $ | 2 | $ | 2
Interest cost |  |  | 3 |  | 4 |  | 9 |  | 12
Amortization of prior service credit |  |  | (2) |  | (6) |  | (6) |  | (17)
Net periodic benefit cost (credit) |  | $ | 2 | $ | (1) | $ | 5 | $ | (3)

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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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