Summary of Significant Accounting Policies - Change in Estimates (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended						3 Months Ended
	Mar. 28, 2014		Mar. 29, 2013		Mar. 30, 2012		Dec. 30, 2011 NHS contract [Member] Contracts Accounted for under Percentage of Completion, U.S. Claims [Member]
Change in Accounting Estimate [Line Items]
Gross favorable	$ 125		$ 142		$ 58
Gross unfavorable	(50)	[1]	(122)	[1]	(289)	[1]
Total net adjustments, before taxes and noncontrolling interests (2)	75	[2]	20	[2]	(231)	[2]
Impact on diluted EPS from continuing operations	$ 0		$ (0.10)		$ (1.30)
Change in accounting estimate, reduction in operating income							$ 1,485

[1] Fiscal 2012 does not include the contract charge related to the Company’s contract with the NHS of $1,485 million (see Note 21).

[2] Quarterly changes in estimated profitability on the same fixed price contract are disclosed gross as either favorable or unfavorable.