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Debt and Credit Facilities (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 29, 2020
USD ($)
Aug. 31, 2020
USD ($)
Sep. 26, 2020
USD ($)
$ / shares
Sep. 26, 2020
USD ($)
$ / shares
Sep. 28, 2019
USD ($)
Mar. 28, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 05, 2019
$ / shares
Debt Instrument [Line Items]                
Long term debt     $ 5,376,000,000 $ 5,376,000,000     $ 5,132,000,000  
Repayment of unsecured revolving credit facility draw       600,000,000 $ 0      
Long term debt under tender offer                
Debt Instrument [Line Items]                
Debt instrument, repurchased principal amount   $ 293,000,000            
Debt instrument, repurchase amount   315,000,000            
Accrued interest   5,000,000            
Loss on repurchase of debt instrument   56,000,000            
Commercial Paper                
Debt Instrument [Line Items]                
Line of credit facility borrowing capacity     2,200,000,000 2,200,000,000        
Long term debt     0 0        
Line of Credit | Revolving Credit Facility 2017                
Debt Instrument [Line Items]                
Long term debt           $ 800,000,000    
Repayment of unsecured revolving credit facility draw       600,000,000        
Outstanding loan amount     200,000,000 200,000,000        
Line of Credit | Revolving Credit Facility 2017 | Subsequent Event                
Debt Instrument [Line Items]                
Repayment of unsecured revolving credit facility draw $ 100,000,000              
Outstanding loan amount $ 100,000,000              
Line of Credit | Revolving Credit Facility | Revolving Credit Facility 2017                
Debt Instrument [Line Items]                
Line of credit facility borrowing capacity     2,200,000,000 2,200,000,000        
Line of Credit | Letter of Credit | Revolving Credit Facility 2017                
Debt Instrument [Line Items]                
Line of credit facility borrowing capacity     500,000,000 500,000,000        
Fronting commitment sub-limit     $ 450,000,000 $ 450,000,000        
Weighted average borrowing rate     1.50% 1.71%        
Senior Notes | 2.3% senior notes due 2030                
Debt Instrument [Line Items]                
Debt instrument face amount   $ 900,000,000            
Interest rate   2.30% 2.30% 2.30%        
Debt instrument net of issuance costs   $ 892,000,000            
Senior Notes | 3.75% senior notes due 2022                
Debt Instrument [Line Items]                
Long term debt     $ 0 $ 0     550,000,000  
Interest rate   3.75% 3.75% 3.75%        
Debt instrument, repurchased principal amount   $ 552,000,000            
Debt instrument, repurchase amount   582,000,000            
Accrued interest   $ 7,000,000            
Senior Notes | 1.75% senior convertible notes due 2024                
Debt Instrument [Line Items]                
Interest rate     1.75% 1.75%        
Convertible Notes | 1.75% senior convertible notes due 2024                
Debt Instrument [Line Items]                
Long term debt     $ 993,000,000 $ 993,000,000     $ 988,000,000  
Debt instrument face amount     $ 1,000,000,000.0 $ 1,000,000,000.0        
Interest rate     1.75% 1.75%        
Convertible time period       2 years        
Conversion rate       0.0049140        
Effective conversion price of convertible shares (in USD per share) | $ / shares     $ 203.50 $ 203.50       $ 203.50
Discount rate       2.45%        
Convertible debt     $ 986,000,000 $ 986,000,000        
Unamortized debt discount     $ 14,000,000 14,000,000        
Increase in Additional paid-in capital, conversion option       $ 14,000,000