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Retirement Plans - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 28, 2024 | Dec. 30, 2023 | Dec. 31, 2022
Change in fair value of plan assets |  |  |
Valuation of owned properties period | 3 years |  |
Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | $ 8,772 | $ 8,413 | $ 7,943
Level 1 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 5,477 | 5,006 |
Level 2 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 679 | 753 |
Level 3 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 479 | 508 |
Not Subject to Leveling | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 2,137 | 2,146 |
Cash and equivalents | Level 1 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 159 | 231 |
Cash and equivalents | Level 2 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 1 | 1 |
Cash and equivalents | Level 3 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
Cash and equivalents | Not Subject to Leveling | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
Domestic equity securities | Level 1 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 3,151 | 2,754 |
Domestic equity securities | Level 2 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
Domestic equity securities | Level 3 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
Domestic equity securities | Not Subject to Leveling | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 307 | 299 |
International equity securities | Level 1 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 1,028 | 1,061 |
International equity securities | Level 2 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
International equity securities | Level 3 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
International equity securities | Not Subject to Leveling | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 290 | 281 |
Mutual funds | Level 1 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 194 | 117 |
Mutual funds | Level 2 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
Mutual funds | Level 3 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
National, state and local governments | Level 1 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 899 | 679 |
National, state and local governments | Level 2 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 60 | 142 |
National, state and local governments | Level 3 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
National, state and local governments | Not Subject to Leveling | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 13 | 88 |
Corporate debt | Level 1 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 46 | 164 |
Corporate debt | Level 2 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 618 | 610 |
Corporate debt | Level 3 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
Corporate debt | Not Subject to Leveling | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 148 | 90 |
Private investment partnerships | Level 1 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
Private investment partnerships | Level 2 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
Private investment partnerships | Level 3 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
Private investment partnerships | Not Subject to Leveling | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 974 | 1,000 |
Real estate | Level 1 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
Real estate | Level 2 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 0 | 0 |
Real estate | Level 3 |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 479 | 508 | $ 569
Real estate | Level 3 | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | 479 | 508 |
Real estate | Not Subject to Leveling | Pension Benefits |  |  |
Change in fair value of plan assets |  |  |
Fair value of total pension plan assets | $ 405 | $ 388 |

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