Defined Benefit Pension Plan Accounting Policy Change Impact on Consolidated Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 03, 2014	Sep. 27, 2013	Oct. 03, 2014	Sep. 27, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income	$ 156	$ 242	$ 307	$ 419
Gain on dispositions			13	98
Decrease in liabilities			340	427
Previous accounting methods
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income	141		276	368
Decrease in liabilities			(309)
Previous accounting methods | As previously reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income		209	276	368
Gain on dispositions				(86)
Decrease in liabilities				(388)
Impact of change in accounting methods
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income	15	33	31	51
Gain on dispositions				(12)
Decrease in liabilities			$ (31)	$ (39)