Long-Term Debt (Receivables Facility Narrative) (Details) (USD $)			1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Receivables Facility, Name [Member] Receivables Facility [Member]	Dec. 31, 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
Maximum Borrowing Capacity of Receivables Facility			$ 300,000,000
Debt	9,541,305,000	8,846,504,000		300,000,000
Receivables included in the Receivables Facility				$ 927,800,000