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Employee Benefits (Tables) | 6 Months Ended
--- | ---
Jun. 29, 2019
Retirement Benefits [Abstract] |
Components of Plan Benefit Expense | Pension
| Quarter ended |  | Year-to-date period ended
(millions) | June 29, 2019 | June 30, 2018 |  | June 29, 2019 | June 30, 2018
Service cost | $ | 9 |  | $ | 22 |  |  | $ | 18 |  | $ | 44 |
Interest cost | 44 |  | 41 |  |  | 89 |  | 83 |
Expected return on plan assets | (83 | ) | (90 | ) |  | (168 | ) | (182 | )
Amortization of unrecognized prior service cost | 2 |  | 2 |  |  | 4 |  | 4 |
Recognized net (gain) loss | 10 |  | (2 | ) |  | 11 |  | (11 | )
Net periodic benefit cost | $ | (18 | ) | $ | (27 | ) |  | $ | (46 | ) | $ | (62 | )
Other nonpension postretirement
| Quarter ended |  | Year-to-date period ended
(millions) | June 29, 2019 | June 30, 2018 |  | June 29, 2019 | June 30, 2018
Service cost | $ | 4 |  | $ | 4 |  |  | $ | 7 |  | $ | 9 |
Interest cost | 10 |  | 9 |  |  | 20 |  | 18 |
Expected return on plan assets | (21 | ) | (23 | ) |  | (42 | ) | (47 | )
Amortization of unrecognized prior service (gain) | (2 | ) | (2 | ) |  | (4 | ) | (4 | )
Total postretirement benefit (income) expense | $ | (9 | ) | $ | (12 | ) |  | $ | (19 | ) | $ | (24 | )
Postemployment
| Quarter ended |  | Year-to-date period ended
(millions) | June 29, 2019 | June 30, 2018 |  | June 29, 2019 | June 30, 2018
Service cost | $ | 1 |  | $ | 1 |  |  | $ | 2 |  | $ | 2 |
Interest cost | 1 |  | — |  |  | 1 |  | — |
Recognized net (gain) loss | (1 | ) | (1 | ) |  | (2 | ) | (2 | )
Total postemployment benefit expense | $ | 1 |  | $ | — |  |  | $ | 1 |  | $ | — |
Contributions to Employee Benefit Plans | Company contributions to employee benefit plans are summarized as follows:
(millions) | Pension | Nonpension postretirement | Total
Quarter ended: |  |  |
June 29, 2019 | $ | 3 |  | $ | 4 |  | $ | 7 |
June 30, 2018 | $ | 251 |  | $ | 4 |  | $ | 255 |
Year-to-date period ended: |  |  |
June 29, 2019 | $ | 4 |  | $ | 8 |  | $ | 12 |
June 30, 2018 | $ | 266 |  | $ | 8 |  | $ | 274 |
Full year: |  |  |
Fiscal year 2019 (projected) | $ | 7 |  | $ | 18 |  | $ | 25 |
Fiscal year 2018 (actual) | $ | 270 |  | $ | 17 |  | $ | 287 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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