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Debt and Credit Facilities (Maturities Of Long-Term Debt Disclosures) (Details) - USD ($)
Dec. 31, 2018
Nov. 30, 2018
Apr. 30, 2018
Dec. 31, 2017
Commercial Paper $ 0     $ 0
Other Long-term Debt 126,000,000     35,000,000
Total debt 9,859,000,000     7,222,000,000
Current maturities of debt 1,373,000,000     632,000,000
Total Long-term Debt 8,486,000,000     6,590,000,000
Unamortized debt issuance costs 50,000,000     39,000,000
Borrowing capacity on existing facilities 1,548,000,000     1,547,000,000
Fair value of senior unsecured notes $ 9,746,000,000     7,521,000,000
Senior Unsecured Notes 1.30% due 2018        
Stated interest rate 1.30%   1.30%  
Unsecured Debt $ 0   $ 0 600,000,000
Senior Unsecured Notes 1.800% due 2019        
Stated interest rate 1.80%      
Unsecured Debt $ 500,000,000     499,000,000
Senior Unsecured Notes 2.000% due 2019        
Stated interest rate 2.00%      
Unsecured Debt $ 750,000,000     748,000,000
Senior Unsecured Notes 4.375% due 2020        
Stated interest rate 4.375%      
Unsecured Debt $ 499,000,000     498,000,000
Senior Unsecured Notes, Variable, due 2020        
Unsecured Debt $ 343,000,000     0
Senior Unsecured Notes 2.625% due 2021        
Stated interest rate 2.625%      
Unsecured Debt $ 747,000,000     746,000,000
Senior Unsecured Notes, 1.125%, due 2023        
Stated interest rate 1.125% 1.125%    
Unsecured Debt $ 627,000,000     0
Senior Unsecured Notes 3.375% due 2024        
Stated interest rate 3.375%      
Unsecured Debt $ 584,000,000     598,000,000
Senior Unsecured Notes 3.375% due 2025        
Stated interest rate 3.375%      
Unsecured Debt $ 746,000,000     745,000,000
Senior Unsecured Notes 3.50% due 2026        
Stated interest rate 3.50%      
Unsecured Debt $ 990,000,000     988,000,000
Senior Unsecured Notes,2.125%, due 2027        
Stated interest rate 2.125% 2.125%    
Unsecured Debt $ 853,000,000     0
Senior Unsecured Notes 3.650% due 2028        
Stated interest rate 3.65%      
Unsecured Debt $ 595,000,000     0
Senior Unsecured Notes, 2.625% due 2030        
Stated interest rate 2.625% 2.625%    
Unsecured Debt $ 733,000,000     0
Senior Unsecured Notes 4.10% due 2043        
Stated interest rate 4.10%      
Unsecured Debt $ 391,000,000     391,000,000
Senior Unsecured Notes 4.375% due 2044        
Stated interest rate 4.375%      
Unsecured Debt $ 395,000,000     394,000,000
Senior Unsecured Notes 4.625% due 2046        
Stated interest rate 4.625%      
Unsecured Debt $ 980,000,000     $ 980,000,000