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Debt and Credit Agreements - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2017
Dec. 31, 2017
Dec. 30, 2016
Dec. 25, 2015
Debt Instrument [Line Items]        
Long-term Debt Issued   $ 850,000,000 $ 2,200,000,000 $ 1,200,000,000
Repayments of long-term debt   333,000,000 1,419,000,000 $ 229,000,000
Net increase in debt     800,000,000  
Debt extinguishment expense     115,000,000  
Repayments of debt     1,400,000,000  
Notes due 2027        
Debt Instrument [Line Items]        
Long-term Debt Issued $ 850,000,000      
Notes issued, interest rate 3.25%      
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  
Unsecured Revolving Credit Facility, Current | Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility capacity   1,000,000,000    
Line of credit facility, amount outstanding   0    
Accounts Receivable Securitization Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Line of credit facility capacity   200,000,000    
Line of credit facility, amount outstanding   $ 0    
Line of credit facility, total expiration period   3 years