Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 02, 2015	Dec. 27, 2013	Jan. 02, 2015	Dec. 27, 2013
Income Taxes [Abstract]
Effective Income Tax Rate, Continuing Operations	25.10%	21.50%	43.90%	27.30%
Tax benefit (expense) from losses in pension plan	$ (462)	$ 114	$ (462)	$ 114
Non-deductible penalty related to SEC settlement	190		190
Tax expense (benefit) from mark-to-market adjustments (as a percent)	(2.90%)	(10.00%)	16.70%	(4.30%)
Tax benefit from reversal of uncertain state tax positions	11		15
Tax benefit from reversal of uncertain state tax position (as a percent)	2.70%		36.50%
Tax benefit from settlement of foreign audits		6		6
Tax benefit from settlement of foreign audits, percent		1.70%		0.70%
Valuation Allowance [Line Items]
Uncertain state tax positions for which statute of limitations has expired			16
Possible reduction in liability for uncertain tax positions over next twelve months			15
UK tax authority | Foreign tax authority
Valuation Allowance [Line Items]
Valuation allowance related to deferred tax assets	$ 360		$ 360