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Financial Instruments (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Derivatives, Fair Value [Line Items]        
Senior Notes $ 200,000,000 $ 2,200,000,000    
Derivative, Net Liability Position, Aggregate Fair Value 283,000,000      
Collateral Already Posted, Aggregate Fair Value 0      
Debt instrument, fair value 50,000,000,000 34,000,000,000    
Expected reclassification of net gain/(losses) related to hedge from accumulated OCI into net income within the next 12 months (7,000,000)      
Cash and cash equivalents and restricted cash 8,254,000,000 5,570,000,000 $ 10,769,000,000 $ 10,657,000,000
Short-term Investments 1,366,000,000 229,000,000    
Debt Securities, Held-to-maturity 2,100,000,000 $ 130,000,000    
Debt Instrument, Face Amount     $ 732,000,000  
Derivative, Amount of Hedged Item $ 19,000,000      
Interest Rate Contracts        
Derivatives, Fair Value [Line Items]        
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 3.00% 9.00%    
Commodity Contracts        
Derivatives, Fair Value [Line Items]        
Derivative, Higher Remaining Maturity Date 3 years      
Derivative, Notional Amount $ 1,100,000,000 $ 1,100,000,000    
Foreign Exchange Contract        
Derivatives, Fair Value [Line Items]        
Derivative, Higher Remaining Maturity Date 2 years      
Derivative, Notional Amount $ 1,900,000,000 1,900,000,000    
Net Investment Hedging [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Notional Amount 2,700,000,000 2,500,000,000    
Interest Rate Contracts        
Derivatives, Fair Value [Line Items]        
Derivative, Notional Amount $ 3,000,000,000.0 $ 5,000,000,000.0    
Cross Currency Interest Rate Contract [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Higher Remaining Maturity Date 12 years      
U.S. Treasury Securities - STI [Member]        
Derivatives, Fair Value [Line Items]        
Debt Securities, Held-to-maturity $ 100,000,000      
U.S Treasury Securities - Cash and Cash Equivalents [Member]        
Derivatives, Fair Value [Line Items]        
Debt Securities, Held-to-maturity 2,000,000,000.0      
Commercial Paper        
Derivatives, Fair Value [Line Items]        
Debt Securities, Held-to-maturity 260,000,000      
Commercial Paper - Cash and Cash Equivalents [Member]        
Derivatives, Fair Value [Line Items]        
Debt Securities, Held-to-maturity 75,000,000      
Commercial paper - STI [Member]        
Derivatives, Fair Value [Line Items]        
Debt Securities, Held-to-maturity $ 185,000,000