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Debt and Credit Agreements - Narrative (Details) - USD ($)
12 Months Ended
Dec. 30, 2016
Dec. 25, 2015
Dec. 26, 2014
Sep. 30, 2016
Sep. 29, 2016
Debt Instrument [Line Items]          
Long-term Debt Issued $ 2,200,000,000 $ 1,200,000,000 $ 1,000,000,000    
Repayments of long-term debt 1,419,000,000 $ 229,000,000 $ 933,000,000    
Net increase in debt 800,000,000        
Debt extinguishment expense 115,000,000        
Repayments of debt 1,400,000,000        
Notes due 2026 | Unsecured Debt          
Debt Instrument [Line Items]          
Face amount of debt issued $ 700,000,000        
Notes issued, interest rate 2.60%        
Notes due 2046 | Unsecured Debt          
Debt Instrument [Line Items]          
Face amount of debt issued $ 800,000,000        
Notes issued, interest rate 3.80%        
Notes due 2066 | Unsecured Debt          
Debt Instrument [Line Items]          
Face amount of debt issued $ 700,000,000        
Notes issued, interest rate 4.25%        
Notes due May 1, 2017 | Unsecured Debt          
Debt Instrument [Line Items]          
Notes issued, interest rate 5.60%        
Early redemption amount $ 300,000,000        
Notes due March 15, 2018 | Unsecured Debt          
Debt Instrument [Line Items]          
Notes issued, interest rate 6.25%        
Early redemption amount $ 600,000,000        
Notes due February 1, 2019 | Unsecured Debt          
Debt Instrument [Line Items]          
Notes issued, interest rate 7.375%        
Early redemption amount $ 500,000,000        
Notes due 2050 | Unsecured Debt          
Debt Instrument [Line Items]          
Face amount of debt issued $ 600,000,000        
Notes issued, interest rate 3.95%        
Notes due 2025 | Unsecured Debt          
Debt Instrument [Line Items]          
Face amount of debt issued $ 600,000,000        
Notes issued, interest rate 3.35%        
Unsecured Revolving Credit Facility, Current | Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility, amount outstanding $ 0        
Line of credit liquidity (up to) 1,000,000,000        
Accounts Receivable Securitization Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, amount outstanding $ 0        
Line of credit facility, total expiration period 3 years        
Line of credit liquidity (up to)       $ 200,000,000 $ 250,000,000