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Debt and Credit Facilities (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 06, 2020
USD ($)
Jun. 27, 2020
USD ($)
$ / shares
Jun. 27, 2020
USD ($)
$ / shares
Jun. 29, 2019
USD ($)
Sep. 05, 2019
$ / shares
Debt Instrument [Line Items]          
Repayment of revolver draw     $ 300,000,000 $ 0  
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   800,000,000 800,000,000    
Repayment of revolver draw   300,000,000      
Outstanding loan amount   500,000,000 500,000,000    
Line of Credit | Revolving Credit Facility 2017 | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Repayment of revolver draw $ 200,000,000        
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   1.69% 1.79%    
Convertible Notes | 1.75% Senior Convertible Notes Due in 2024          
Debt Instrument [Line Items]          
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