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Debt (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Unsecured Letter Of Credit Facility [Member]
Jun. 30, 2012
Unsecured Letter Of Credit Facility [Member]
Dec. 31, 2011
Unsecured Letter Of Credit Facility [Member]
Dec. 31, 2012
Letter Of Credit [Member]
Dec. 31, 2011
Letter Of Credit [Member]
Dec. 31, 2012
Financial Services [Member]
Dec. 31, 2011
Financial Services [Member]
Dec. 31, 2010
Financial Services [Member]
Dec. 31, 2012
Financial Services [Member]
Repurchase Agreements [Member]
Debt Instrument                              
Long-term debt principal total $ 2,500,000,000     $ 2,500,000,000                      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 0     0                      
Long-term Debt, Maturities, Repayments of Principal in Year Two 398,900,000     398,900,000                      
Long-term Debt, Maturities, Repayments of Principal in Year Three 369,200,000     369,200,000                      
Long-term Debt, Maturities, Repayments of Principal in Year Four 465,200,000     465,200,000                      
Long-term Debt, Maturities, Repayments of Principal in Year Five 150,000,000     150,000,000                      
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,200,000,000     1,200,000,000                      
Extinguishment of Debt, Amount       592,400,000 323,900,000 898,500,000                  
Loss on debt retirements 32,100,000 2,100,000 3,500,000 32,071,000 5,638,000 38,920,000                  
Letters of Credit Outstanding, Amount 179,200,000 235,900,000   179,200,000 235,900,000   124,600,000   152,700,000 54,500,000 83,200,000        
Line of Credit Facility, Expiration Date             Sep. 01, 2014               Sep. 27, 2013
Maximum borrowing capacity             150,000,000 200,000,000       150,000,000 2,500,000 2,500,000 150,000,000
Date reduced credit facility limit             Jul. 02, 2012                
Days from time of origination of loan to point of sale to third party       30 days                      
Line of Credit Facility, Initiation Date                             Sep. 28, 2012
Financial Services debt $ 138,795,000 $ 0   $ 138,795,000 $ 0                   $ 138,795,000