Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Percentage price equivalent at which long-term debt principal amount is redeemable prior to a specified date.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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The effective interest rate at the end of the reporting period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt (Senior Notes) (Narrative) (Details) (USD $)								9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended	12 Months Ended						9 Months Ended
Debt (Senior Notes) (Narrative) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 2016 Senior Notes	Sep. 30, 2013 2018 - 6.0% Senior Notes	Sep. 30, 2013 Interest rate swaps	Dec. 31, 2012 Interest rate swaps	Jun. 18, 2013 Interest rate swaps 2016 Senior Notes	Sep. 30, 2013 Senior Notes 2016 Senior Notes	Jun. 18, 2013 Senior Notes 2016 Senior Notes	Dec. 31, 2012 Senior Notes 2016 Senior Notes	Sep. 30, 2013 Senior Notes 2018 - 2.6% Senior Notes	Jun. 18, 2013 Senior Notes 2018 - 2.6% Senior Notes	Dec. 31, 2012 Senior Notes 2018 - 2.6% Senior Notes	Sep. 30, 2013 Senior Notes 2017 Senior Notes	Dec. 31, 2012 Senior Notes 2017 Senior Notes	May 12, 2010 Senior Notes 2017 Senior Notes	Sep. 30, 2013 Senior Notes 2018 - 6.0% Senior Notes	Dec. 31, 2012 Senior Notes 2018 - 6.0% Senior Notes	Nov. 09, 2010 Senior Notes 2018 - 6.0% Senior Notes	Sep. 30, 2013 Senior Notes 2020 Senior Notes	Dec. 31, 2012 Senior Notes 2020 Senior Notes	Sep. 30, 2013 Senior Notes 2023 Senior Notes	Dec. 31, 2012 Senior Notes 2023 Senior Notes	Sep. 30, 2013 Senior Notes Redemption premium 2017 Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 4,733,966,000							$ 500,000,000	$ 500,000,000		$ 650,000,000	$ 650,000,000					$ 800,000,000			$ 1,000,000,000		$ 750,000,000
Debt instrument, interest rate, stated percentage			1.80%									2.60%				7.625%			6.00%
Notional amount of interest rate fair value hedge derivatives					1,000,000,000	500,000,000	500,000,000
Debt instrument, interest rate at period end			1.45%	3.22%
Long-term debt	5,779,441,000	5,431,948,000		500,000,000				498,825,000		0	648,710,000		0	0	550,000,000		813,691,000	826,974,000		1,012,352,000	1,013,372,000	748,552,000	748,452,000
Discount on debt								300,000			1,300,000						8,600,000	9,700,000				1,400,000	1,500,000
Equivalent price percentage of principal amount redeemable								100.00%			100.00%
Debt instrument, basis spread on variable rate								0.20%			0.30%
Total redemption amount														608,800,000
Redemption premium														63,900,000										58,800,000
Fair value adjustment								(800,000)									22,300,000	36,600,000
Premium on debt																				$ 12,400,000	$ 13,400,000