Debt (Narrative) (Details)	3 Months Ended		12 Months Ended			1 Months Ended	12 Months Ended							12 Months Ended	1 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2011 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Jan. 31, 2011 6.25% Senior Notes Due 2021 [Member] USD ($)	Dec. 31, 2011 7.75% Senior Notes Due 2015 [Member] USD ($)	Dec. 31, 2011 6.25% Senior Secured Notes Due 2011 [Member] USD ($)	Dec. 31, 2011 6.25% Senior Secured Notes Due 2011 [Member] EUR (€)	Dec. 31, 2010 6.25% Senior Secured Notes Due 2011 [Member] USD ($)	Dec. 31, 2010 6.25% Senior Secured Notes Due 2011 [Member] EUR (€)	Jul. 31, 2010 7.125% Senior Notes Due 2018 [Member] USD ($)	Jul. 31, 2010 7.125% Senior Notes Due 2018 [Member] EUR (€)	Dec. 31, 2010 7.625% Senior Notes Due 2013 [Member] USD ($)	Nov. 30, 2011 U.S. Dollar Term Loan Facility [Member] USD ($)	Jun. 30, 2010 U.S. Dollar Term Loan Facility [Member] USD ($)	Jun. 30, 2010 Euro Term Loan Facility [Member] USD ($)	Dec. 31, 2012 Senior Secured Revolving Credit Facilities [Member] USD ($)	Jun. 30, 2011 Existing Senior Secured Credit Facilities [Member] U.S. Dollar Term Loan Facility [Member] USD ($)	Dec. 31, 2011 Existing Senior Secured Credit Facilities [Member] U.S. Dollar Term Loan Facility [Member]	Dec. 31, 2011 Existing Senior Secured Credit Facilities [Member] Euro Term Loan Facility [Member] USD ($)	Jun. 30, 2011 Existing Senior Secured Credit Facilities [Member] Euro Term Loan Facility [Member] EUR (€)	Dec. 31, 2011 Term Loan Facilities [Member] USD ($)	Dec. 31, 2011 Term Loan Facilities [Member] Euro Term Loan Facility [Member] USD ($)	Dec. 31, 2011 Term Loan Facilities [Member] Euro Term Loan Facility [Member] EUR (€)	Dec. 31, 2012 Minimum [Member] Senior Secured Revolving Credit Facilities [Member]	Dec. 31, 2012 Maximum [Member] Senior Secured Revolving Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, fair value			$ 3,603,000,000
Aggregate maturities of long term debt excluding unamortized discounts, year one			115,000,000
Aggregate maturities of long term debt excluding unamortized discounts, year two			183,000,000
Aggregate maturities of long term debt excluding unamortized discounts, year three			195,000,000
Aggregate maturities of long term debt excluding unamortized discounts, year four			720,000,000
Aggregate maturities of long term debt excluding unamortized discounts, year five			416,000,000
Cash payments for interest			205,000,000	203,000,000	163,000,000
Facilities include provisions for letters of credit																		210,000,000
Line of credit facility, borrowing capacity																		1,104,000,000
Line of credit facility, maximum borrowing capacity																		1,200,000,000
Amount borrowed			45,000,000	119,000,000														45,000,000
Outstanding letters of credit																		51,000,000
Debt instrument stated percentage						6.25%	7.75%	6.25%	6.25%	6.25%	6.25%	7.125%	7.125%	7.625%	1.75%					1.75%						1.75%	2.25%
Line of credit facility, facing fee rate			0.25%
Debt, covenant description			The senior secured revolving credit facilities and term loans contain financial covenants including an interest coverage ratio and a total net leverage ratio.
Senior notes						700,000,000
Bond issue cost			0	22,000,000	31,000,000	11,000,000									5,000,000				6,000,000
Term Loan Facilities															350,000,000				200,000,000		355,000,000	274,000,000
Available borrowing capacity															1,000,000,000
Loss from early extinguishments of debt	2,000,000	30,000,000	0	(32,000,000)	(16,000,000)
Write off of deferred financing fees				5,000,000	4,000,000
Senior notes, principal amount												650,000,000	500,000,000
Repayments of debt							600,000,000	121,000,000	83,000,000	101,000,000	76,000,000			200,000,000		200,000,000	200,000,000						147,000,000	159,000,000	108,000,000
Premiums paid on extinguishment of debt				$ 27,000,000	$ 12,000,000		$ 25,000,000			$ 4,000,000				$ 8,000,000