Basis of Presentation Income Before Income Tax (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 03, 2014	Sep. 27, 2013	Oct. 03, 2014	Sep. 27, 2013	Mar. 28, 2014
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Gross favorable	$ 43	$ 58	$ 72	$ 75
Gross unfavorable	(7)	(17)	(17)	(26)
Total net adjustments, before taxes and non-controlling interest	36	41	55	49
Impact on diluted EPS from continuing operations (usd per share)	$ 0.15	$ 0.18	$ 0.21	$ 0.20
Unbilled recoverable amounts primarily from governments that are expected to be collected after one year	55		55		46
Depreciation expense	$ 155	$ 165	$ 324	$ 333