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Schedule of Fair Value of Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 28, 2024
Dec. 30, 2023
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Company-owned life insurance $ 132 $ 138
Carrying Amount | Long-Term Debt | New Facilities loans Under Third Amended Credit Agreement due 2025    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, fair value 0 53
Carrying Amount | Long-Term Debt | Revolving Loan Facility loans under the Fourth Amended Credit Agreement, due 2029    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, fair value 160 0
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Company-owned life insurance 132 138
Fair Value | Long-Term Debt | New Facilities loans Under Third Amended Credit Agreement due 2025    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, fair value 0 53
Fair Value | Long-Term Debt | Revolving Loan Facility loans under the Fourth Amended Credit Agreement, due 2029    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, fair value 160 0
Revenue bonds, due in varying amounts periodically through 2029 | Carrying Amount | Long-Term Debt    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, fair value 75 75
Revenue bonds, due in varying amounts periodically through 2029 | Fair Value | Long-Term Debt    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, fair value 76 76
American & Foreign Power Company, Inc. 5% debentures, due 2030 | Carrying Amount | Long-Term Debt    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, fair value 16 16
American & Foreign Power Company, Inc. 5% debentures, due 2030 | Fair Value | Long-Term Debt    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-term debt, fair value $ 16 $ 14