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Schedule of Debt (Detail) - USD ($)
$ in Millions
Dec. 25, 2021
Dec. 26, 2020
Debt Instrument [Line Items]    
Finance lease obligations $ 17 [1] $ 21
Other current maturities of long-term debt 3 3
Total 20 24
Finance lease obligations 35 [1] 57
Other financing obligations 3 6
Total 228 354
Revenue bonds, due in varying amounts periodically through 2029    
Debt Instrument [Line Items]    
Long term debt 75 176
Third Amended and Restated Credit Agreement    
Debt Instrument [Line Items]    
New Facilities loans under the Third Amended Credit Agreement, due 2025 100 100
American & Foreign Power Company, Inc. 5% debentures, due 2030    
Debt Instrument [Line Items]    
Long term debt $ 15 $ 15
[1] Finance lease payments include $1 million related to options to extend lease terms that are reasonably certain of being exercised.