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Debt and Credit Facilities Schedule of Debt (Details) - USD ($)
Sep. 26, 2020
Aug. 31, 2020
Mar. 28, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Long-term debt, gross $ 5,376,000,000     $ 5,132,000,000
Adjustments for unamortized gains on interest rate swap terminations (2,000,000)     (3,000,000)
Less: current portion (212,000,000)     (16,000,000)
Long-term debt 5,162,000,000     5,113,000,000
Line of Credit | $2.2 billion unsecured revolving credit facility due April 2022        
Debt Instrument [Line Items]        
Long-term debt, gross 200,000,000     0
Line of Credit | Revolving Credit Facility 2017        
Debt Instrument [Line Items]        
Long-term debt, gross     $ 800,000,000  
Line of Credit | Revolving Credit Facility 2017 | Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility borrowing capacity $ 2,200,000,000      
Senior Notes | 3.75% senior notes due 2022        
Debt Instrument [Line Items]        
Interest rate 3.75% 3.75%    
Long-term debt, gross $ 0     550,000,000
Senior Notes | 3.5% senior notes due 2023        
Debt Instrument [Line Items]        
Interest rate 3.50%      
Long-term debt, gross $ 323,000,000     597,000,000
Senior Notes | 4.0% senior notes due 2024        
Debt Instrument [Line Items]        
Interest rate 4.00%      
Long-term debt, gross $ 582,000,000     593,000,000
Senior Notes | 1.75% senior convertible notes due 2024        
Debt Instrument [Line Items]        
Interest rate 1.75%      
Senior Notes | 6.5% debentures due 2025        
Debt Instrument [Line Items]        
Interest rate 6.50%      
Senior Notes | 7.5% debentures due 2025        
Debt Instrument [Line Items]        
Interest rate 7.50%      
Senior Notes | 4.6% senior notes due 2028        
Debt Instrument [Line Items]        
Interest rate 4.60%      
Long-term debt, gross $ 692,000,000     691,000,000
Senior Notes | 6.5% debentures due 2028        
Debt Instrument [Line Items]        
Interest rate 6.50%      
Senior Notes | 4.6% senior notes due 2029        
Debt Instrument [Line Items]        
Interest rate 4.60%      
Long-term debt, gross $ 804,000,000     804,000,000
Senior Notes | 2.3% senior notes due 2030        
Debt Instrument [Line Items]        
Interest rate 2.30% 2.30%    
Senior Notes | 6.625% senior notes due 2037        
Debt Instrument [Line Items]        
Interest rate 6.625%      
Long-term debt, gross $ 37,000,000     37,000,000
Senior Notes | 5.5% senior notes due 2044        
Debt Instrument [Line Items]        
Interest rate 5.50%      
Long-term debt, gross $ 396,000,000     396,000,000
Senior Notes | 5.22% debentures due 2097        
Debt Instrument [Line Items]        
Interest rate 5.22%      
Convertible Notes | 1.75% senior convertible notes due 2024        
Debt Instrument [Line Items]        
Interest rate 1.75%      
Long-term debt, gross $ 993,000,000     988,000,000
Unsecured Debt | 6.5% debentures due 2025        
Debt Instrument [Line Items]        
Long-term debt, gross 70,000,000     72,000,000
Unsecured Debt | 7.5% debentures due 2025        
Debt Instrument [Line Items]        
Long-term debt, gross 252,000,000     254,000,000
Unsecured Debt | 6.5% debentures due 2028        
Debt Instrument [Line Items]        
Long-term debt, gross 24,000,000     24,000,000
Unsecured Debt | 2.3% senior notes due 2030        
Debt Instrument [Line Items]        
Long-term debt, gross 892,000,000     0
Unsecured Debt | 5.22% debentures due 2097        
Debt Instrument [Line Items]        
Long-term debt, gross 92,000,000     91,000,000
Other long-term debt        
Debt Instrument [Line Items]        
Long-term debt, gross $ 19,000,000     $ 35,000,000