Debt (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013		Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Debt Instrument [Line Items]
Extinguishment of Debt, Amount	$ 405,000,000
Gains (Losses) on Extinguishment of Debt	25,000,000
Derivative, Notional Amount	450,000,000		450,000,000
Notional Amount Of Interest Rate Derivatives Unwound During Period	225,000,000		225,000,000
Principal payments of long-term obligations			779,637,000		550,000,000
Short-term Debt, Weighted Average Interest Rate	0.42%		0.42%
Other	40,227,000	[1]	40,227,000	[1]		52,375,000	[1]
Total debt	3,650,590,000		3,650,590,000			4,017,375,000
Current portion	299,570,000		299,570,000			375,000,000
Long-term debt	3,351,020,000		3,351,020,000			3,642,375,000
Term loans
Debt Instrument [Line Items]
Debt Instrument, Face Amount	230,000,000		230,000,000			230,000,000
Debt due 2013
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.875%		3.875%
Debt Instrument, Face Amount	0	[2],[3]	0	[2],[3]		375,000,000	[2],[3]
Debt Due 2014 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.875%	[2],[3]	4.875%	[2],[3]
Debt Instrument, Face Amount	299,570,000		299,570,000			450,000,000
Debt due 2015
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.00%	[3]	5.00%	[3]
Debt Instrument, Face Amount	274,879,000	[3]	274,879,000	[3]		400,000,000	[3]
Debt due 2016
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%	[3]	4.75%	[3]
Debt Instrument, Face Amount	370,914,000	[3]	370,914,000	[3]		500,000,000	[3]
Debt due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.75%		5.75%
Debt Instrument, Face Amount	500,000,000		500,000,000			500,000,000
Debt due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.25%		6.25%
Debt Instrument, Face Amount	300,000,000		300,000,000			300,000,000
Debt due 2022
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.25%		5.25%
Debt Instrument, Face Amount	110,000,000		110,000,000			110,000,000
Debt due 2037
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.25%		5.25%
Debt Instrument, Face Amount	500,000,000		500,000,000			500,000,000
Debt due 2043
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.70%	[4]	6.70%	[4]
Debt Instrument, Face Amount	425,000,000	[4]	425,000,000	[4]		0	[4]
Maximum
Debt Instrument [Line Items]
Commercial Paper	100,000,000		100,000,000
Average Borrowings
Debt Instrument [Line Items]
Commercial Paper	33,000,000		33,000,000
LIBOR | Debt due 2018
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.60%		5.60%
Debt Instrument, Face Amount	250,000,000		250,000,000			250,000,000
Prime Rate | Debt due 2018
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%		4.75%
Debt Instrument, Face Amount	$ 350,000,000		$ 350,000,000			$ 350,000,000

[1] Other consists of the unamortized proceeds received from unwinding of interest rate swaps, unamortized net debt discounts and the fair value adjustment of interest rate swaps.

[2] Prior to the Tender Offer, we had interest rate swap agreements with an aggregate notional value of $450 million that effectively converted the fixed rate interest payments on these notes into variable interest rates. As a result of the Tender Offer, we unwound $225 million of these swap agreements.

[3] During the first quarter, we completed a cash tender offer (the Tender Offer) for a portion of our 4.875% Notes due 2014, our 5.0% Notes due 2015, and our 4.75% Notes due 2016 (the Subject Notes). Holders who validly tendered their notes received the principal amount of the notes tendered, all accrued and unpaid interest and a premium amount. An aggregate $405 million of the Subject Notes were tendered. We recognized a net loss of $25 million, consisting of the payment of the call premium and transaction fees and the write-off of unamortized costs, partially offset by a gain from the unwinding of interest rate swap agreements as other expense, net on the Condensed Consolidated Statements of Income.

[4] During the first quarter, we issued $425 million of 6.7% fixed rate 30-year notes. Interest is payable quarterly. The notes mature in 2043, but may be redeemed, at our option, in whole or in part, at any time on or after March 7, 2018 at a redemption price equal to 100% of the principal amount, plus accrued and unpaid interest. We used the net proceeds from the notes to fund the Tender Offer.