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Debt - Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Principal outstanding, net of unamortized discount $ 2,826 $ 3,082  
Current maturities (284) (263)  
Long-term maturities 2,542 2,819  
Interest expensed 160 149 $ 115
Interest paid $ 154 142 $ 105
Commercial Paper      
Debt Instrument [Line Items]      
Interest rate (in hundredths) 0.49%    
Principal outstanding, net of unamortized discount $ 0 201  
Senior Notes Payable Due 2016      
Debt Instrument [Line Items]      
Maturity date Dec. 15, 2016    
Interest rate (in hundredths) 1.15%    
Principal outstanding, net of unamortized discount $ 250 250  
Senior Notes Payable Due 2017      
Debt Instrument [Line Items]      
Maturity date Jun. 15, 2017    
Interest rate (in hundredths) 1.40%    
Principal outstanding, net of unamortized discount $ 250 250  
Senior Notes Payable Due 2018      
Debt Instrument [Line Items]      
Maturity date Jul. 15, 2018    
Interest rate (in hundredths) 6.375%    
Principal outstanding, net of unamortized discount $ 450 450  
Senior Notes Payable Due 2021      
Debt Instrument [Line Items]      
Maturity date Jun. 01, 2021    
Interest rate (in hundredths) 4.50%    
Principal outstanding, net of unamortized discount $ 250 250  
Senior Notes Payable Due 2022      
Debt Instrument [Line Items]      
Maturity date Apr. 30, 2022    
Interest rate (in hundredths) 3.60%    
Principal outstanding, net of unamortized discount $ 250 250  
Senior Notes Payable Due 2023      
Debt Instrument [Line Items]      
Maturity date Dec. 15, 2023    
Interest rate (in hundredths) 4.00%    
Principal outstanding, net of unamortized discount $ 250 250  
Senior Notes Payable Due 2024      
Debt Instrument [Line Items]      
Maturity date Jun. 15, 2024    
Interest rate (in hundredths) 3.70%    
Principal outstanding, net of unamortized discount $ 250 250  
Senior Notes Payable Due 2038      
Debt Instrument [Line Items]      
Maturity date Jul. 15, 2038    
Interest rate (in hundredths) 7.00%    
Principal outstanding, net of unamortized discount $ 300 300  
Senior Notes Payable Due 2041      
Debt Instrument [Line Items]      
Maturity date Jun. 01, 2041    
Interest rate (in hundredths) 5.95%    
Principal outstanding, net of unamortized discount $ 250 250  
Senior Notes Payable Due 2043      
Debt Instrument [Line Items]      
Maturity date Dec. 15, 2043    
Interest rate (in hundredths) 5.125%    
Principal outstanding, net of unamortized discount $ 250 250  
Senior Notes Payable      
Debt Instrument [Line Items]      
Unamortized original issue discount (6) (7)  
Other Debt      
Debt Instrument [Line Items]      
Principal outstanding, net of unamortized discount 22 67  
Obligations Under Capital Leases      
Debt Instrument [Line Items]      
Principal outstanding, net of unamortized discount $ 60 $ 71