Subsequent Events (Details)	0 Months Ended			0 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Oct. 19, 2012 USD ($)	Sep. 28, 2012 USD ($)	Mar. 30, 2012 USD ($)	Oct. 19, 2012 Subsequent Event [Member] EUR (€) Employees	Sep. 18, 2012 Four Year Unsecured Credit Facility [Member] USD ($)	Sep. 28, 2012 CSC Italia [Member] USD ($)	Sep. 28, 2012 Term Notes 550 Due 2013 [Member]	Mar. 30, 2012 Term Notes 550 Due 2013 [Member]	Sep. 28, 2012 Term Notes 500 Due 2013 [Member]	Mar. 30, 2012 Term Notes 500 Due 2013 [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							5.50%	5.50%	5.00%	5.00%
Debt Instrument, Maturity Date							Mar. 31, 2013	Mar. 31, 2013	Feb. 28, 2013	Feb. 28, 2013
Line of Credit Facility, Current Borrowing Capacity					$ 250,000,000
Gains (Losses) on Extinguishment of Debt	19,000,000
Intercompany Transfer of Ownership Interest in Subsidiary				1
Intercompany Transfer of Ownership Interest in Subsidiary, Number of Employees To Be Transferred				1,000
Intercompany Transfer of Ownership Interest in Subsidiary, Equity Contribution Upon Transfer				27,000,000
Assets, Current		5,468,000,000	4,883,000,000			45,000,000
Assets, Noncurrent						1,000,000
Liabilities, Current		4,015,000,000	4,536,000,000			27,000,000
Liabilities, Noncurrent						$ 16,000,000