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Debt - Long-term Debt Information (Details)
$ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2021
USD ($)
Jul. 31, 2020
USD ($)
Jul. 31, 2020
CAD ($)
Feb. 29, 2020
USD ($)
Aug. 31, 2019
USD ($)
Dec. 25, 2021
USD ($)
Dec. 26, 2020
USD ($)
Dec. 28, 2019
USD ($)
Debt Instrument [Line Items]                
Debt issuance costs             $ 31 $ 25
Unamortized debt issuance costs           $ 97 130  
Amortization of debt issuance costs           12 11 15
Unamortized debt premium, net           298 344  
Amortization of debt premium, net           16 14 34
Repayments of long-term debt           6,202 4,697 $ 4,795
Fair value of total debt           25,700 32,100  
Carrying value of total debt           $ 21,800 $ 28,300  
Senior notes due in February 2021                
Debt Instrument [Line Items]                
Repayments of long-term debt $ 111              
Senior Notes | Senior Notes Due February 2020                
Debt Instrument [Line Items]                
Repayments of long-term debt       $ 405        
Senior Notes | Senior Notes Due July 2020                
Debt Instrument [Line Items]                
Repayments of long-term debt   $ 200            
Senior Notes | Canadian Dollar Senior Notes Due July 2020                
Debt Instrument [Line Items]                
Repayments of long-term debt     $ 500          
Senior Notes | Senior Notes Due August 2019                
Debt Instrument [Line Items]                
Repayments of long-term debt         $ 350