Basis of Presentation Income Before Income Tax (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Oct. 02, 2015	Oct. 03, 2014	Oct. 02, 2015	Oct. 03, 2014	Apr. 03, 2015
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Gross favorable	$ 15	$ 43	$ 37	$ 72
Gross unfavorable	(2)	(7)	(11)	(17)
Total net adjustments, before taxes and non-controlling interest	$ 13	$ 36	$ 26	$ 55
Impact on diluted EPS from continuing operations (usd per share)	$ 0.05	$ 0.15	$ 0.11	$ 0.21
Unbilled recoverable amounts primarily from governments that are expected to be collected after one year	$ 27		$ 27		$ 19
Depreciation expense	$ 131	$ 155	$ 265	$ 324