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Employee Benefits (Tables) | 9 Months Ended
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Sep. 26, 2020
Retirement Benefits [Abstract] |
Components of Plan Benefit Expense | Pension
| Quarter ended |  | Year-to-date period ended
(millions) | September 26, 2020 | September 28, 2019 |  | September 26, 2020 | September 28, 2019
Service cost | $ | 9 |  | $ | 9 |  |  | $ | 27 |  | $ | 27 |
Interest cost | 31 |  | 42 |  |  | 99 |  | 131 |
Expected return on plan assets | (87) |  | (86) |  |  | (257) |  | (254) |
Amortization of unrecognized prior service cost | 1 |  | 1 |  |  | 5 |  | 5 |
Recognized net (gain) loss | 7 |  | 23 |  |  | 64 |  | 34 |
Net periodic benefit cost | $ | (39) |  | $ | (11) |  |  | $ | (62) |  | $ | (57) |
Curtailment (gain) loss | — |  | (11) |  |  | (7) |  | (11) |
Total pension (income) expense | $ | (39) |  | $ | (22) |  |  | $ | (69) |  | $ | (68) |
Other nonpension postretirement
| Quarter ended |  | Year-to-date period ended
(millions) | September 26, 2020 | September 28, 2019 |  | September 26, 2020 | September 28, 2019
Service cost | $ | 2 |  | $ | 5 |  |  | $ | 9 |  | $ | 12 |
Interest cost | 7 |  | 10 |  |  | 23 |  | 30 |
Expected return on plan assets | (24) |  | (23) |  |  | (70) |  | (65) |
Amortization of unrecognized prior service cost | (1) |  | (2) |  |  | (6) |  | (6) |
Recognized net (gain) loss | — |  | (55) |  |  | — |  | (55) |
Net periodic benefit cost | (16) |  | (65) |  |  | (44) |  | (84) |
Curtailment (gain) loss | — |  | (6) |  |  | — |  | (6) |
Total postretirement benefit (income) expense | $ | (16) |  | $ | (71) |  |  | $ | (44) |  | $ | (90) |
Postemployment
| Quarter ended |  | Year-to-date period ended
(millions) | September 26, 2020 | September 28, 2019 |  | September 26, 2020 | September 28, 2019
Service cost | $ | 1 |  | $ | 1 |  |  | $ | 3 |  | $ | 3 |
Interest cost | 1 |  | — |  |  | 1 |  | 1 |
Recognized net (gain) loss | — |  | (1) |  |  | (2) |  | (3) |
Total postemployment benefit expense | $ | 2 |  | $ | — |  |  | $ | 2 |  | $ | 1 |
Contributions to Employee Benefit Plans | Company contributions to employee benefit plans are summarized as follows:
(millions) | Pension | Nonpension postretirement | Total
Quarter ended: |  |  |
September 26, 2020 | $ | 1 |  | $ | 6 |  | $ | 7 |
September 28, 2019 | $ | 2 |  | $ | 5 |  | $ | 7 |
Year-to-date period ended: |  |  |
September 26, 2020 | $ | 4 |  | $ | 15 |  | $ | 19 |
September 28, 2019 | $ | 6 |  | $ | 13 |  | $ | 19 |
Full year: |  |  |
Fiscal year 2020 (projected) | $ | 7 |  | $ | 19 |  | $ | 26 |
Fiscal year 2019 (actual) | $ | 10 |  | $ | 18 |  | $ | 28 |

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