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.