Debt (Senior Secured Credit Facility) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012
Debt Instrument [Line Items]
Minimum sales total that results in required mandatory principal payments	$ 250,000,000
Receivables-Backed Facility [Member]
Debt Instrument [Line Items]
Period of LIBOR rate plus applicable margin	1
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letter of credit facility, maximum borrowing capacity	1,500,000,000
Term of debt, in years	5
Line of credit, amount outstanding	145,000,000
Average daily balance under facility	109,000,000
Letters of credit outstanding amount	2,200,000
Senior Secured Revolving Credit Facility [Member] | Letter Of Credit [Member]
Debt Instrument [Line Items]
Letter of credit facility, maximum borrowing capacity	350,000,000
Senior Secured Revolving Credit Facility [Member] | Swing Line Loans [Member]
Debt Instrument [Line Items]
Letter of credit facility, maximum borrowing capacity	150,000,000
Revolving Credit Facility Maturing On April 2, 2012 [Member]
Debt Instrument [Line Items]
Letter of credit facility, maximum borrowing capacity	1,500,000,000
Revolving Credit Facility Maturing On April 2, 2014 [Member]
Debt Instrument [Line Items]
Letter of credit facility, maximum borrowing capacity	1,275,000,000
Non-Extended Revolving Credit Facility Maturing On April 2, 2014 [Member]
Debt Instrument [Line Items]
Letter of credit facility, maximum borrowing capacity	225,000,000
Conditions Not Requiring Prior Approval Under Credit Agreement [Member]
Debt Instrument [Line Items]
Ownership percentage, minimum	51.00%
Conditions Not Requiring Prior Approval Under Credit Agreement [Member] | Leverage Ratio Greater 4.5 Times [Member]
Debt Instrument [Line Items]
Maximum permitted leverage ratio	4.50
Restrictions On Certain Payments Pursuant To Senior Secured Credit Facility [Member] | Leverage Ratio Greater 4.5 Times [Member]
Debt Instrument [Line Items]
Maximum permitted leverage ratio	4.50
Receivables Securitization Facility [Member]
Debt Instrument [Line Items]
Letters of credit outstanding amount	245,500,000
Receivables Securitization Facility [Member] | Receivables-Backed Facility [Member]
Debt Instrument [Line Items]
Letter of credit facility, maximum borrowing capacity	600,000,000
Line of credit, amount outstanding	279,500,000
Average daily balance under facility	271,200,000
Total value of receivables sold	886,900,000
Term Loan A [Member]
Debt Instrument [Line Items]
Term of debt, in years	5
Debt instrument, principal amount	1,500,000,000
Outstanding borrowings under term loan	651,000,000
Term Loan B [Member]
Debt Instrument [Line Items]
Term of debt, in years	7
Debt instrument, principal amount	1,800,000,000
Outstanding borrowings under term loan	1,710,000,000
Maximum [Member] | Conditions Not Requiring Prior Approval Under Credit Agreement [Member]
Debt Instrument [Line Items]
Single acquisition amount permitted under credit agreements	500,000,000
Maximum [Member] | Conditions Not Requiring Prior Approval Under Credit Agreement [Member] | Leverage Ratio Greater 4.5 Times [Member]
Debt Instrument [Line Items]
Single acquisition amount permitted under credit agreements	$ 100,000,000