Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		3 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011	Jun. 29, 2012 Restricted Stock Awards [Member]	Sep. 28, 2012 Three Year Performance Period [Member]	Jun. 29, 2012 Board Of Directors Members [Member] Restricted Stock Awards [Member]	Sep. 28, 2012 Chief Executive Officer [Member] Performance Based Restricted Stock Units [Member]	Sep. 28, 2012 Chief Executive Officer [Member] Three Year Performance Period [Member]	Sep. 28, 2012 Chief Executive Officer [Member] Performance Contingent Stock Units [Member]	Sep. 28, 2012 Lowest Price Threshold [Member] Three Year Performance Period [Member]	Sep. 28, 2012 Middle Price Threshold [Member] Three Year Performance Period [Member]	Sep. 28, 2012 Highest Price Threshold [Member] Three Year Performance Period [Member]	Sep. 28, 2012 PCUs Vested And Released In Third Quarter [Member] Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards issued							112,923
Stock-based compensation expense	$ 45	$ 38	$ 83	$ 77	$ 2
Weighted-average fair value per grant					$ 15.94
Shares to vest upon lowest price threshold						150,000
Shares granted								115,000	80,000	450,000				150,000
PCSU threshold											$ 18.00	$ 20.00	$ 22.00