Credit Facilities and Long-Term Debt (Details Textual) In Millions, unless otherwise specified		3 Months Ended
	Mar. 31, 2013 Letter of Credit USD ($)	Mar. 31, 2013 Revolving Credit Facility USD ($)	Mar. 31, 2013 Risk Sharing Finance Facility Agreement [Member] USD ($)	Mar. 31, 2013 Risk Sharing Finance Facility Agreement [Member] EUR (€)	Mar. 31, 2013 Senior Notes	Mar. 31, 2013 Senior Notes Due 2016, 3.550% USD ($)	Sep. 20, 2011 Senior Notes Due 2016, 3.550%	Dec. 31, 2012 Senior Notes Due 2021, 4.875% USD ($)	Sep. 20, 2011 Senior Notes Due 2021, 4.875%	Mar. 31, 2013 Fair Value, Inputs, Level 2 Senior Notes Due 2021, 4.875% USD ($)
Credit Facilities and Long-Term Debt [Abstract]
Interest on notes due							3.55%		4.875%
Fair value of senior notes due						$ 639		$ 680		$ 669
Interest payment failure period					30 days
Other covenant default period after servicing of notice					90 days
Percentage of holding required for servicing of notice					25.00%
Redemption price percentage					101.00%
Debt instrument aggregate principal amount	$ 100	$ 600	$ 154	€ 120
Interest rate per annum, effective rate		1.00%
Maximum leverage ratio		3.50	3.50	3.50