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Schedule of Fair Value of Assets and Liabilities (Detail) - USD ($)
$ in Millions
Sep. 27, 2025
Dec. 28, 2024
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Company-owned life insurance $ 119 $ 132
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 33 160
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Company-owned life insurance 119 132
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 33 160
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 $ 14 $ 16