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Debt (Consolidated Debt) (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long term debt $ 3,825,702,000 $ 3,458,294,000
Weighted-Average Interest Rate [1] 4.60%  
Debt Instrument, Face Amount $ 3,800,000,000.0 3,400,000,000.0
Unamortized Debt Acquisition Costs - Contra Liability (23,441,000) (18,672,000)
Current portion of long-term debt, net 250,229,000 250,335,000
Long-term debt, net 3,552,032,000 3,189,287,000
Senior Notes [Member] | 5.65% Notes Due 2016 [Member]    
Debt Instrument [Line Items]    
Long term debt [2] $ 250,229,000 250,335,000
Weighted-Average Interest Rate [1] 5.70%  
Debt Instrument, Face Amount $ 250,000,000.0 $ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage 5.65% 5.65%
Senior Notes [Member] | 6.40% Notes Due 2018 [Member]    
Debt Instrument [Line Items]    
Long term debt $ 254,698,000 $ 255,215,000
Weighted-Average Interest Rate [1] 5.50%  
Debt Instrument, Face Amount $ 250,000,000.0 $ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage 6.40% 6.40%
Senior Notes [Member] | 6.55% Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Long term debt $ 563,161,000 $ 564,116,000
Weighted-Average Interest Rate [1] 5.70%  
Debt Instrument, Face Amount $ 550,000,000.0 $ 550,000,000
Debt Instrument, Interest Rate, Stated Percentage 6.55% 6.55%
Senior Notes [Member] | 4.25% Notes Due 2021 [Member]    
Debt Instrument [Line Items]    
Long term debt $ 555,121,000 $ 555,362,000
Weighted-Average Interest Rate [1] 4.00%  
Debt Instrument, Face Amount $ 550,000,000.0 $ 550,000,000
Debt Instrument, Interest Rate, Stated Percentage 4.25% 4.25%
Senior Notes [Member] | 3.20% Notes Due 2025 [Member]    
Debt Instrument [Line Items]    
Long term debt $ 249,707,000 $ 249,700,000
Weighted-Average Interest Rate [1] 3.20%  
Debt Instrument, Face Amount $ 250,000,000.0 $ 250,000,000.0
Debt Instrument, Interest Rate, Stated Percentage 3.20% 3.20%
Senior Notes [Member] | 5.00% Notes Due 2026 [Member]    
Debt Instrument [Line Items]    
Long term debt $ 649,193,000 $ 0
Weighted-Average Interest Rate [1],[3] 5.00%  
Debt Instrument, Face Amount $ 650,000,000.0 $ 0
Debt Instrument, Interest Rate, Stated Percentage 5.00% 0.00%
Senior Notes [Member] | 6.40% Notes Due 2037 [Member]    
Debt Instrument [Line Items]    
Long term debt $ 249,042,000 $ 249,036,000
Weighted-Average Interest Rate [1] 6.40%  
Debt Instrument, Face Amount $ 250,000,000.0 $ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage 6.40% 6.40%
Senior Notes [Member] | 4.20% Notes Due 2042 [Member]    
Debt Instrument [Line Items]    
Long term debt $ 248,445,000 $ 248,437,000
Weighted-Average Interest Rate [1] 4.20%  
Debt Instrument, Face Amount $ 250,000,000.0 $ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage 4.20% 4.20%
Senior Notes [Member] | 5.15% Notes Due 2043 [Member]    
Debt Instrument [Line Items]    
Long term debt $ 556,192,000 $ 556,218,000
Weighted-Average Interest Rate [1] 5.10%  
Debt Instrument, Face Amount $ 550,000,000.0 $ 550,000,000.0
Debt Instrument, Interest Rate, Stated Percentage 5.15% 5.15%
Senior Notes [Member] | 4.20% Notes Due 2045 [Member]    
Debt Instrument [Line Items]    
Long term debt $ 249,914,000 $ 249,914,000
Weighted-Average Interest Rate [1] 4.60%  
Debt Instrument, Face Amount $ 250,000,000.0 $ 250,000,000.0
Debt Instrument, Interest Rate, Stated Percentage 4.20% 4.20%
Commercial Paper [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Long term debt $ 0 $ 279,961,000
Weighted-Average Interest Rate [1],[3] 0.70%  
[1] Weighted-average interest rate includes the amortization/accretion of discounts, premiums and gains/losses realized on historical cash flow and fair value hedges recognized as interest expense.
[2] These borrowings will mature in October 2016 and are included with current debt on our consolidated balance sheets at December 31, 2015 and March 31, 2016.
[3] These borrowings were outstanding for only a portion of the three-month period ending March 31, 2016. The weighted-average interest rate for these borrowings was calculated based on the number of days the borrowings were outstanding during the noted period.