Restatement and Adjustment of Consolidated Financial Statements - Narrative (Details) (USD $)	12 Months Ended						3 Months Ended		36 Months Ended	3 Months Ended
	Mar. 28, 2014	Mar. 29, 2013	Mar. 30, 2012	Apr. 01, 2011	Apr. 02, 2010	Apr. 03, 2009	Dec. 30, 2011	Apr. 01, 2011	Apr. 01, 2011	Jan. 02, 2015
Goodwill impairment	$ 0	$ 0	$ 232,000,000
Diluted EPS (in dollars per share)	$ 6.28	$ 4.89	$ (3.97)
Cost of Services	9,272,000,000	11,293,000,000	12,643,000,000
Revenues	12,998,000,000	14,195,000,000	14,673,000,000
Other assets and liabilities, net	(41,000,000)	(40,000,000)	5,000,000
Restatement Adjustment [Member]
Cost of Services			(36,000,000)	(17,000,000)	22,000,000	25,000,000
Revenues			68,000,000	5,000,000	(38,000,000)	(35,000,000)
Billed and unbilled receivables				132,000,000				132,000,000	132,000,000
Other assets and liabilities, net				19,000,000
Miscellaneous errors [Member]
Goodwill impairment			232,000,000	2,511,000,000
Diluted EPS (in dollars per share)			$ (2.20)
Cost of Services			12,278,000,000
Revenues			14,673,000,000
Other assets and liabilities, net			3,000,000
Miscellaneous errors [Member] | Restatement Adjustment [Member]
Goodwill impairment			(2,513,000,000)	2,511,000,000
Change in net income			3,901,000,000
Diluted EPS (in dollars per share)			$ 25.17
Cost of Services			97,000,000
Revenues			197,000,000
Other assets and liabilities, net			(9,000,000)
Miscellaneous errors [Member] | Scenario, Previously Reported [Member]
Goodwill impairment			2,745,000,000	0
Diluted EPS (in dollars per share)	$ 4.47	$ 6.18	$ (27.37)
Cost of Services	9,567,000,000	11,100,000,000	12,181,000,000
Revenues	12,998,000,000	14,195,000,000	14,476,000,000
Other assets and liabilities, net	(33,000,000)	(31,000,000)	12,000,000
NHS contract [Member]
Contract impairment							1,485,000,000
NHS contract [Member] | Contracts Accounted for under Percentage of Completion, U.S. Claims [Member]
Change in operating income								1,158,000,000	129,000,000
Change in net income			3,901,000,000
Revenues				132,000,000
Contracts in Process				1,007,000,000				1,007,000,000	1,007,000,000
NHS contract [Member] | Contracts Accounted for under Percentage of Completion, U.S. Claims [Member] | Restatement Adjustment [Member]
Cost of Services			(146,000,000)	(37,000,000)	35,000,000	131,000,000
Subsequent Event [Member] | NHS contract [Member] | Contracts Accounted for under Percentage of Completion, U.S. Claims [Member]
Penalty related to SEC settlement										190,000,000
Settlement expense recorded										$ 197,000,000