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DEBT AND CREDIT FACILITIES (Schedule Of Long-Term Debt) (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total Face Amount $ 4,528,000,000 $ 4,814,800,000
Letters of credit outstanding 43,900,000 48,000,000
Long-term Debt 3,247,200,000 3,043,500,000
Current portion of long-term debt 234,700,000 20,900,000
Long-term debt noncurrent portion 3,012,500,000 3,022,600,000
$700 Million 4.875% 2021 Senior Note [Member]
   
Debt Instrument [Line Items]    
Stated interest rate 4.875%  
Type Fixed Fixed
Final Maturity 2021 2021
Total Face Amount 700,000,000 700,000,000
Long-term Debt 699,500,000 [1] 699,400,000 [1]
Debt Instrument, Unamortized Discount 500,000 600,000
Imputed interest rate 4.89% 4.88%
$500 million 4.80% 2020 Senior Notes [Member]
   
Debt Instrument [Line Items]    
Stated interest rate 4.80%  
Type Fixed Fixed
Final Maturity 2020 2020
Total Face Amount 500,000,000 500,000,000
Long-term Debt 499,300,000 [2] 499,200,000 [2]
Debt Instrument, Unamortized Discount 700,000 800,000
Imputed interest rate 4.83% 4.83%
$800 Million 6.25% 2040 Senior Notes [Member]
   
Debt Instrument [Line Items]    
Stated interest rate 6.25%  
Type Fixed Fixed
Final Maturity 2040 2040
Total Face Amount 800,000,000 800,000,000
Long-term Debt 790,500,000 [3] 790,400,000 [3]
Debt Instrument, Unamortized Discount 9,500,000 9,600,000
Imputed interest rate 6.34% 6.34%
$400 Million 5.90% 2020 Senior Notes [Member]
   
Debt Instrument [Line Items]    
Stated interest rate 5.90%  
Type Fixed Fixed
Final Maturity 2020 2020
Total Face Amount 400,000,000 400,000,000
Long-term Debt 398,600,000 [4] 398,400,000 [4]
Debt Instrument, Unamortized Discount 1,400,000 1,600,000
Imputed interest rate 5.98% 5.98%
$500 Million 3.95% 2018 Senior Notes [Member]
   
Debt Instrument [Line Items]    
Stated interest rate 3.95%  
Type Fixed Fixed
Final Maturity 2018 2018
Total Face Amount 500,000,000.0 500,000,000.0
Long-term Debt 497,100,000 [5] 496,500,000 [5]
Debt Instrument, Unamortized Discount 2,900,000 3,500,000
Imputed interest rate 4.14% 4.14%
Revolving Credit Facility [Member]
   
Debt Instrument [Line Items]    
Type Variable Variable
Final Maturity 2017 2017
Total Face Amount 1,250,000,000 1,750,000,000
Credit facility, amount outstanding 0 [6] 0 [6]
Letters of credit outstanding 5,200,000 8,400,000
Imputed interest rate 1.87% 1.64%
Credit facility remaining capacity 1,200,000,000 1,700,000,000
Equipment Loans [Member]
   
Debt Instrument [Line Items]    
Type Fixed Fixed
Final Maturity 2020 2020
Total Face Amount 164,800,000 164,800,000
Long-term Debt 146,100,000 161,700,000
Short-term Debt [Member]
   
Debt Instrument [Line Items]    
Final Maturity 2014/2015  
Total Face Amount 213,200,000  
Interest Rate Swap [Member]
   
Debt Instrument [Line Items]    
Fair Value Adjustment to Interest Rate Hedge $ 2,900,000 $ (2,100,000)
[1] As of September 30, 2014 and December 31, 2013, the $700 million 4.875 percent senior notes were recorded at a par value of $700 million less unamortized discounts of $0.5 million and $0.6 million, respectively, based on an imputed interest rate of 4.89 percent.
[2] As of September 30, 2014 and December 31, 2013, the $500 million 4.80 percent senior notes were recorded at a par value of $500 million less unamortized discounts of $0.7 million and $0.8 million, respectively, based on an imputed interest rate of 4.83 percent.
[3] As of September 30, 2014 and December 31, 2013, the $800 million 6.25 percent senior notes were recorded at a par value of $800 million less unamortized discounts of $9.5 million and $9.6 million, respectively, based on an imputed interest rate of 6.34 percent.
[4] As of September 30, 2014 and December 31, 2013, the $400 million 5.90 percent senior notes were recorded at a par value of $400 million less unamortized discounts of $1.4 million and $1.6 million, respectively, based on an imputed interest rate of 5.98 percent.
[5] As of September 30, 2014 and December 31, 2013, the $500 million 3.95 percent senior notes were recorded at a par value of $500 million less unamortized discounts of $2.9 million and $3.5 million, respectively, based on an imputed interest rate of 4.14 percent.
[6] As of September 30, 2014 and December 31, 2013, no revolving loans were drawn under the revolving credit agreement. As of September 30, 2014 and December 31, 2013, the principal amount of letter of credit obligations totaled $5.2 million and $8.4 million, respectively, thereby reducing available borrowing capacity to $1.2 billion and $1.7 billion for each period, respectively.