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Long-Term Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument Table [Line Items]      
Long-term Commercial Paper, Noncurrent $ 259,718,000 $ 0  
Long-Term Debt 6,649,718,000 5,890,000,000  
Capital Lease Obligation 45,064,000 51,221,000  
Less: Current Portion of Long-Term Debt 6,579,000 6,579,000  
Unamortized Debt Discount 34,518,000 31,288,000  
Total Long-Term Debt 6,653,685,000 5,903,354,000  
Debt Instrument Issuance [Abstract]      
Long-Term Debt Repayments 500,000,000 500,000,000 $ 400,000,000
Long-Term Debt by Maturity [Abstract]      
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2016 400,000,000    
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2017 600,000,000    
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2018 350,000,000    
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2019 900,000,000    
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2020 $ 1,000,000,000    
Revolving Credit Agreement 2011      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Expiration Date Oct. 11, 2016    
Maximum borrowing capacity $ 2,000,000,000    
Revolving Credit Agreement 2015      
Line of Credit Facility [Line Items]      
Eurodollar rate at period end (in hundredths) 1.33%    
Base rate at period end (in hundredths) 3.50%    
Current Borrowings Outstanding $ 0    
Line of Credit Facility, Expiration Date Jul. 21, 2020    
Maximum borrowing capacity $ 2,000,000,000    
Maximum total debt-to-total capitalization ratio allowed under financial covenant (in hundredths) 65.00%    
Letters of Credit Outstanding, Amount $ 0    
Uncommitted Credit Facilities      
Line of Credit Facility [Line Items]      
Average Borrowings Outstanding 0 $ 100,000  
Weighted average interest rate (in hundredths)   0.70%  
Current Borrowings Outstanding 0 $ 0  
Commercial Paper      
Line of Credit Facility [Line Items]      
Average Borrowings Outstanding $ 81,000,000 $ 12,000,000  
Weighted average interest rate (in hundredths) 0.51% 0.25%  
Current Borrowings Outstanding $ 260,000,000 $ 0  
5.10% Senior Notes Due 2036      
Debt Instrument Issuance [Abstract]      
Debt Instrument Issuance Face Amount $ 250,000,000    
Debt Instrument Issuance Interest Rate 5.10%    
4.15% Senior Notes Due 2026      
Debt Instrument Issuance [Abstract]      
Debt Instrument Issuance Face Amount $ 750,000,000    
Debt Instrument Issuance Interest Rate 4.15%    
2.625% Senior Notes due 2023      
Debt Instrument Table [Line Items]      
Long-Term Debt $ 1,250,000,000 1,250,000,000  
3.15% Senior Notes due 2025      
Debt Instrument Table [Line Items]      
Long-Term Debt 500,000,000 0  
Debt Instrument Issuance [Abstract]      
Debt Instrument Issuance Face Amount $ 500,000,000    
Debt Instrument Issuance Interest Rate 3.15%    
3.90% Senior Notes due 2035      
Debt Instrument Table [Line Items]      
Long-Term Debt $ 500,000,000 0  
Debt Instrument Issuance [Abstract]      
Debt Instrument Issuance Face Amount $ 500,000,000    
Debt Instrument Issuance Interest Rate 3.90%    
2.95% Senior Notes due 2015      
Debt Instrument Table [Line Items]      
Long-Term Debt $ 0 500,000,000  
Debt Instrument Issuance [Abstract]      
Debt Instrument Issuance Interest Rate 2.95%    
Long-Term Debt Repayments $ 500,000,000    
2.500% Senior Notes due 2016      
Debt Instrument Table [Line Items]      
Long-Term Debt $ 400,000,000 400,000,000  
Debt Instrument Issuance [Abstract]      
Debt Instrument Issuance Interest Rate 2.50%    
Long-Term Debt by Maturity [Abstract]      
Aggregate annual maturity of long-term debt in 2015 $ 400,000,000    
5.875% Senior Notes due 2017      
Debt Instrument Table [Line Items]      
Long-Term Debt 600,000,000 600,000,000  
6.875% Senior Notes due 2018      
Debt Instrument Table [Line Items]      
Long-Term Debt 350,000,000 350,000,000  
5.625% Senior Notes due 2019      
Debt Instrument Table [Line Items]      
Long-Term Debt 900,000,000 900,000,000  
4.40% Senior Notes due 2020      
Debt Instrument Table [Line Items]      
Long-Term Debt 500,000,000 500,000,000  
2.45% Senior Notes due 2020      
Debt Instrument Table [Line Items]      
Long-Term Debt 500,000,000 500,000,000  
4.100% Senior Notes due 2021      
Debt Instrument Table [Line Items]      
Long-Term Debt 750,000,000 750,000,000  
6.65% Senior Notes due 2028      
Debt Instrument Table [Line Items]      
Long-Term Debt 140,000,000 $ 140,000,000  
the Notes      
Debt Instrument Issuance [Abstract]      
Net Proceeds From Issuance of Senior Long-Term Debt 990,000,000    
the New Notes      
Debt Instrument Issuance [Abstract]      
Net Proceeds From Issuance of Senior Long-Term Debt $ 991,000,000