Retirement Benefit Plans , Other Disclosures (Details) $ in Millions	12 Months Ended
	Apr. 24, 2015 USD ($)	Apr. 25, 2014 USD ($)	Apr. 26, 2013 USD ($)	May. 01, 2005 plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cost of retirement benefit plans	$ 433	$ 419	$ 419
Underfunded status of the plan	(1,274)	(488)
Estimated future employer contributions in next fiscal year	79
Defined Contribution Savings Plan
Expense under defined contribution plans	$ 188	145	163
Treasury bond rate of guaranteed rate of return	10 years
U.S. Defined Contribution Pension Plan, PIA
Defined Contribution Savings Plan
Expense under defined contribution plans	$ 53	50	50
U.S. Defined Contribution Pension Plan, PIA
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Underfunded status of the plan	(752)	(286)
Defined benefit plan, future amortization of net actuarial loss	(98)
Employer contributions	91	88
Post-retirement benefit plans, net periodic benefit cost	114	149	140
Post-retirement benefit plans, benefit obligations	2,956	2,203	2,154
Post-retirement benefit plans, fair value of plan assets	2,204	1,917	1,717
Defined Contribution Savings Plan
Number of new plans created | plan				2
Non-U.S. Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Underfunded status of the plan	(458)	(142)
Defined benefit plan, future amortization of net actuarial loss	(22)
Employer contributions	80	48
Post-retirement benefit plans, net periodic benefit cost	64	60	46
Post-retirement benefit plans, benefit obligations	1,647	1,031	811
Post-retirement benefit plans, fair value of plan assets	1,189	889	733
Post-Retirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Post-retirement benefit plans, net periodic benefit cost	14	15	$ 20
Post-retirement benefit plans, benefit obligations	352	327
Post-retirement benefit plans, fair value of plan assets	$ 288	$ 267