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Debt and Credit Facilities (Maturities Of Long-Term Debt Disclosures) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Commercial Paper $ 200 $ 0
Total debt 6,914 3,998
Current maturities of debt 228 768
Total Long-term Debt 6,686 3,230
Unamortized debt issuance costs 45 24
Available borrowing capacity under all existing facilities 1,551 1,236
Fair value of debt $ 6,762 4,009
Senior Unsecured Notes 2.00% due 2016    
Stated interest rate 2.00%  
Maturity date Sep. 30, 2016  
Unsecured Debt $ 0 749
Senior Unsecured Notes 1.30% due 2018    
Stated interest rate 1.30%  
Maturity date Apr. 01, 2018  
Unsecured Debt $ 598 597
Senior Unsecured Notes 2.000% due 2019    
Stated interest rate 2.00%  
Maturity date Mar. 08, 2019  
Unsecured Debt $ 746 0
Senior Unsecured Notes 4.375% Due 2020    
Stated interest rate 4.375%  
Maturity date Jan. 15, 2020  
Unsecured Debt $ 497 496
Senior Unsecured Notes 2.625% due 2021    
Stated interest rate 2.625%  
Maturity date Mar. 15, 2021  
Unsecured Debt $ 745 0
Senior Unsecured Notes 3.375% due 2024    
Stated interest rate 3.375%  
Maturity date May 15, 2024  
Unsecured Debt $ 602 606
Senior Unsecured Notes 3.375% due 2025    
Stated interest rate 3.375%  
Maturity date Nov. 01, 2025  
Unsecured Debt $ 744 744
Senior Unsecured Notes 3.50% due 2026    
Stated interest rate 3.50%  
Maturity date Mar. 15, 2026  
Unsecured Debt $ 987 0
Senior Unsecured Notes 4.10% due 2043    
Stated interest rate 4.10%  
Maturity date Apr. 01, 2043  
Unsecured Debt $ 391 390
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 [Member] [Domain] [Domain]    
Stated interest rate 4.625%  
Maturity date Mar. 15, 2046  
Unsecured Debt $ 979 0
Other    
Unsecured Debt $ 30 $ 22