Credit Facilities and Long-Term Debt (Details Textual) In Millions, unless otherwise specified		3 Months Ended		3 Months Ended		0 Months Ended
	Oct. 31, 2011 Letter of Credit USD ($)	Mar. 31, 2014 Revolving Credit Facility	Oct. 31, 2011 Revolving Credit Facility USD ($)	Mar. 31, 2014 Risk Sharing Finance Facility Agreement [Member] USD ($)	Dec. 14, 2012 Risk Sharing Finance Facility Agreement [Member] EUR (€)	Sep. 20, 2011 Senior Notes	Mar. 31, 2014 Senior Notes Due 2016, 3.550% USD ($)	Dec. 31, 2013 Senior Notes Due 2016, 3.550% USD ($)	Sep. 20, 2011 Senior Notes Due 2016, 3.550% USD ($)	Mar. 31, 2014 Senior Notes Due 2021, 4.875% USD ($)	Dec. 31, 2013 Senior Notes Due 2021, 4.875% USD ($)	Sep. 20, 2011 Senior Notes Due 2021, 4.875% USD ($)
Credit Facilities and Long-Term Debt [Abstract]
Fair value of senior notes due							$ 633	$ 635		$ 639	$ 629
Interest on notes due									3.55%			4.875%
Long-term Debt, Gross							600	600	600	600	600	600
Redemption price percentage						101.00%
Debt instrument aggregate principal amount	100		600	165	120
Interest rate per annum, effective rate		1.00%
Maximum leverage ratio		3.50		3.50
Line of Credit Facility, Amount Outstanding				$ 39