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Long Term Debt (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended				6 Months Ended	3 Months Ended		6 Months Ended
	Sep. 10, 2011	Apr. 29, 2011	Sep. 10, 2011 Letter of Credit [Member]	Jun. 02, 2011 Letter of Credit [Member]	Sep. 10, 2011 Letter of Credit [Member] Revolving credit facility [Member]	Jun. 18, 2011 Revolving credit facility [Member]	Sep. 10, 2011 Revolving credit facility [Member]	Sep. 10, 2011 Term Loan A [Member]	Sep. 10, 2011 Term Loan B [Member]	Sep. 10, 2011 Term loan B-1 [Member]	Sep. 10, 2011 Term loan B-2 [Member]	Sep. 10, 2011 Term Loan B-3 [Member]	Apr. 29, 2011 Term Loan B-3 [Member]	Sep. 10, 2011 Through December 30, 2011 [Member] Maximum [Member]	Sep. 10, 2011 Through December 30, 2011 [Member] Minimum [Member]	Sep. 10, 2011 From December 31, 2011 [Member] Maximum [Member]	Sep. 10, 2011 From December 31, 2011 [Member] Minimum [Member]	Sep. 10, 2011 Through December 30, 2012 [Member] Maximum [Member]	Sep. 10, 2011 Through December 30, 2012 [Member] Minimum [Member]	Sep. 10, 2011 Maximum [Member]	Sep. 10, 2011 Minimum [Member]
Debt Instrument [Line Items]
Term of credit facilities					5 years			5 years	6 years
Senior secured credit facilities portion extended			$ 1,500								$ 500
Senior secured credit facilities remaining portion				600
New Advances for Term loan B-3													291
Remaining balance for outstanding borrowing			0							249	580	450
Interest rate addition to base rate										1.375%	3.25%	3.50%
Current outstanding borrowing										2	6	5
Letter of credit outstanding	0				311
Unused credit					1,189
Outstanding letter of credit issued under separate agreement	2
Facility fees under the extended portions						0.625%
Leverage Ratio														4.25	1.0	4.0	1.0	3.75	1.0	3.46	1.0
Fixed charge coverage ratio														2.2	1.0	2.25	1.0	2.3	1.0	2.59	1.0
Maximum letter of credit fee							2.75%
LIBOR floor rate												1.00%
Long-Term Debt (Textual) [Abstract]
Term loan B-1 extended into term loan B-2		86
Term loan B-1 extended into term loan B-3		161
Outstanding letter of credit issued under separate agreement	2
Maximum Borrowing Capacity on revolving basis	200
Outstanding Borrowings	0				311
Facility fee in accordance of current credit rating	1.00%
Account receivable pledged as collateral	285
Debt with current maturities that are classified in Long-term debt	$ 247