Long-Term Debt (Receivables Facility Narrative) (Details) (USD $)	9 Months Ended		1 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Mar. 31, 2012 Receivables Facility, Name [Member] Receivables Facility [Member]	Sep. 30, 2012 Receivables Facility, Name [Member] Receivables Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date			Mar. 21, 2012
Debt Instrument, Maturity Date			Mar. 21, 2014
Proceeds from Accounts Receivable Securitization	$ 300,000,000
Maximum Amount of Receivables Facility Outstanding			300,000,000
Debt	9,572,063,000	8,846,504,000		300,000,000
Carrying Amount of Receivables Included in Receivables Facility				$ 866,500,000