Basis of Presentation - accumulated other comprehensive income (loss) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Sep. 28, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Foreign Currency Translation Adjustments, at March 30, 2012	$ 160
Pension and Other Postretirement Benefit Plans, at March 30, 2012	(1,253)
Accumulated Other Comprehensive Loss, at March 30, 2012	(1,093)
Foreign Currency Translation Adjustments	(89)
Pension and Other Postretirement Benefit Plans	54
Accumulated Other Comprehensive Loss	(35)
Foreign Currency Translation Adjustments, at September 28, 2012	71
Pension and Other Postretirement Benefit Plans, at September 28, 2012	(1,199)
Accumulated Other Comprehensive Loss, at September 28, 2012	$ (1,128)