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Debt (Consolidated Debt) (Details) - USD ($)
Dec. 31, 2017
Oct. 03, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 4,550,000,000   $ 4,100,000,000
Debt Issuance Costs, Net [1] (29,472,000)   (26,948,000)
Debt Instrument, Unamortized Discount (Premium), Net [1] 215,000   6,530,000
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge [1] 3,749,000   7,610,000
Long-term Debt 4,524,492,000   4,087,192,000
Current portion of long-term debt, net 250,974,000   0
Long-term Debt, Excluding Current Maturities 4,273,518,000   4,087,192,000
6.40% Notes Due 2018 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 250,000,000   250,000,000
Debt Instrument, Interest Rate, Stated Percentage 6.40%    
6.55% Notes Due 2019 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 550,000,000   550,000,000
Debt Instrument, Interest Rate, Stated Percentage 6.55%    
4.25% Notes Due 2021 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 550,000,000   550,000,000
Debt Instrument, Interest Rate, Stated Percentage 4.25%    
3.20% Notes Due 2025 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 250,000,000   250,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.20%    
5.00% Notes Due 2046 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 650,000,000   650,000,000
Debt Instrument, Interest Rate, Stated Percentage 5.00%    
6.40% Notes Due 2037 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 250,000,000   250,000,000
Debt Instrument, Interest Rate, Stated Percentage 6.40%    
4.20% Notes Due 2042 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 250,000,000   250,000,000
Debt Instrument, Interest Rate, Stated Percentage 4.20%    
5.15% Notes Due 2043 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 550,000,000   550,000,000
Debt Instrument, Interest Rate, Stated Percentage 5.15%    
4.20% Notes Due 2045 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 250,000,000   250,000,000
Debt Instrument, Interest Rate, Stated Percentage 4.20%    
4.25% Notes Due 2046 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 500,000,000   500,000,000
Debt Instrument, Interest Rate, Stated Percentage 4.25%    
4.20% Notes Due 2047 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 500,000,000 $ 500,000,000.0 0
Debt Instrument, Interest Rate, Stated Percentage 4.20% 4.20%  
Commercial Paper [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 0   50,000,000
Line of Credit [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Long-term Debt $ 0   $ 0
[1] Debt issuance costs, note discounts and premiums, and realized gains and losses of historical fair value hedges are being amortized or accreted to the applicable notes over the respective lives of those notes.