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Debt and Credit Facilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Apr. 01, 2018
Dec. 31, 2017
Jan. 31, 2017
Proceeds from issuance of debt $ 600      
Weighted average maturity, commercial paper 29 days      
Commercial Paper $ 100   $ 0  
Total debt 7,904   7,222  
Less current maturities of debt 1,984   632  
Total long-term debt 5,920   6,590  
Unamortized debt issuance costs 42   39  
Available borrowing capacity 1,547   1,547  
Fair value of debt $ 7,893   7,521  
Senior Unsecured Notes 1.30% due 2018 | Subsequent Event        
Stated interest rate   1.30%    
Unsecured Debt   $ 600    
Commercial Paper        
Debt instrument, maturity 397 days      
Weighted average interest rate at point in time 2.60%      
Commercial Paper | Maximum        
Commercial paper $ 1,500      
Senior Unsecured Notes 1.30% due 2018        
Stated interest rate 1.30%      
Maturity Date Apr. 01, 2018      
Unsecured Debt $ 600   600  
Senior Unsecured Notes 1.800% due 2019        
Stated interest rate 1.80%     3.65%
Maturity Date Jan. 15, 2019      
Unsecured Debt $ 499   499  
Senior Unsecured Notes 2.000% due 2019        
Stated interest rate 2.00%      
Maturity Date Mar. 08, 2019      
Unsecured Debt $ 748   748  
Senior Unsecured Notes 4.375% Due 2020        
Stated interest rate 4.375%      
Maturity Date Jan. 15, 2020      
Unsecured Debt $ 498   498  
Senior Unsecured Notes 2.625% due 2021        
Stated interest rate 2.625%      
Maturity Date Mar. 15, 2021      
Unsecured Debt $ 746   746  
Senior Unsecured Notes 3.375% due 2024        
Stated interest rate 3.375%      
Maturity Date May 15, 2024      
Unsecured Debt $ 582   598  
Senior Unsecured Notes 3.375% due 2025        
Stated interest rate 3.375%      
Maturity Date Nov. 01, 2025      
Unsecured Debt $ 745   745  
Senior Unsecured Notes 3.50% due 2026        
Stated interest rate 3.50%      
Maturity Date Mar. 15, 2026      
Unsecured Debt $ 988   988  
Senior Unsecured Notes 3.650% due 2028        
Stated interest rate 3.65%      
Maturity Date Mar. 07, 2028      
Unsecured Debt $ 595   0  
Senior Unsecured Notes 4.10% due 2043        
Stated interest rate 4.10%      
Maturity Date Apr. 01, 2043      
Unsecured Debt $ 391   391  
Senior Unsecured Notes 4.375% due 2044        
Stated interest rate 4.375%      
Maturity Date May 15, 2044      
Unsecured Debt $ 395   394  
Senior Unsecured Notes 4.625% due 2046        
Stated interest rate 4.625%      
Maturity Date Mar. 15, 2046      
Unsecured Debt $ 980   980  
Other Debt        
Unsecured Debt $ 37   $ 35