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Debt and Credit Facilities (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Jan. 31, 2019
Dec. 31, 2018
Commercial Paper $ 0    
Other Long-term Debt 24,000,000   $ 126,000,000
Total debt 8,471,000,000   9,859,000,000
Less current maturities of debt 521,000,000   1,373,000,000
Total long-term debt 7,950,000,000   8,486,000,000
Unamortized debt issuance costs 48,000,000   50,000,000
Available borrowing capacity 1,562,000,000   1,548,000,000
Fair value of senior unsecured notes $ 8,855,000,000   9,746,000,000
Senior Unsecured Notes 1.800% due 2019      
Repaid face amount of debt   $ 500,000,000  
Stated interest rate 1.80%    
Maturity Date Jan. 15, 2019    
Unsecured Debt $ 0   500,000,000
Senior Unsecured Notes 2.000% due 2019      
Repaid face amount of debt $ 750,000,000    
Stated interest rate 2.00%    
Maturity Date Mar. 08, 2019    
Unsecured Debt $ 0   750,000,000
Commercial Paper      
Debt instrument, maturity 397 days    
Commercial Paper | Maximum      
Commercial paper $ 1,500,000,000    
Senior Unsecured Notes 4.375% due 2020      
Stated interest rate 4.375%    
Maturity Date Jan. 15, 2020    
Unsecured Debt $ 499,000,000   499,000,000
Senior Unsecured Notes Variable due 2020      
Maturity Date Nov. 30, 2020    
Unsecured Debt $ 338,000,000   343,000,000
Senior Unsecured Notes 2.625% due 2021      
Stated interest rate 2.625%    
Maturity Date Mar. 15, 2021    
Unsecured Debt $ 748,000,000   747,000,000
Senior Unsecured Notes 1.125% due 2021      
Stated interest rate 1.125%    
Maturity Date Nov. 30, 2023    
Unsecured Debt $ 618,000,000   627,000,000
Senior Unsecured Notes 3.375% due 2024      
Stated interest rate 3.375%    
Maturity Date May 15, 2024    
Unsecured Debt $ 585,000,000   584,000,000
Senior Unsecured Notes 3.375% due 2025      
Stated interest rate 3.375%    
Maturity Date Nov. 01, 2025    
Unsecured Debt $ 746,000,000   746,000,000
Senior Unsecured Notes 3.50% due 2026      
Stated interest rate 3.50%    
Maturity Date Mar. 15, 2026    
Unsecured Debt $ 990,000,000   990,000,000
Senior Unsecured Notes 2.125% due 2027      
Stated interest rate 2.125%    
Maturity Date Nov. 30, 2027    
Unsecured Debt $ 840,000,000   853,000,000
Senior Unsecured Notes 3.650% due 2028      
Stated interest rate 3.65%    
Maturity Date Mar. 07, 2028    
Unsecured Debt $ 595,000,000   595,000,000
Senior Unsecured Notes 2.625% due 2030      
Stated interest rate 2.625%    
Maturity Date Nov. 30, 2030    
Unsecured Debt $ 722,000,000   733,000,000
Senior Unsecured Notes 4.100% due 2043      
Stated interest rate 4.10%    
Maturity Date Apr. 01, 2043    
Unsecured Debt $ 391,000,000   391,000,000
Senior Unsecured Notes 4.375% due 2044      
Stated interest rate 4.375%    
Maturity Date May 15, 2044    
Unsecured Debt $ 395,000,000   395,000,000
Senior Unsecured Notes 4.625% due 2046      
Stated interest rate 4.625%    
Maturity Date Mar. 15, 2046    
Unsecured Debt $ 980,000,000   $ 980,000,000