Retirement Benefit Plans , Change in Benefit Obligation and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017	Apr. 26, 2019	Apr. 27, 2018
Funded status at end of year:
Underfunded status of the plans				$ (1,100)	$ (942)
Amounts recognized on the consolidated balance sheets consist of:
Non-current liabilities				(1,651)	(1,425)
Pension benefits
Plans with accumulated benefit obligations in excess of plan assets
Accumulated benefit obligation				4,683	4,110
Projected benefit obligation				4,822	4,282
Plan assets at fair value				3,829	3,472
Plans with projected benefit obligations in excess of plan assets
Projected benefit obligation				4,963	4,736
Plan assets at fair value				3,833	3,793
U.S. Pension Benefits | Pension benefits
Defined Benefit Plan Disclosure [Line items]
Accumulated benefit obligation at end of year				3,121	2,943
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$ 3,202	$ 3,232
Service cost	109	116	$ 117
Interest cost	129	117	109
Employee contributions	0	0
Plan curtailments and settlements	0	(168)
Actuarial loss (gain)	54	12
Benefits paid	(100)	(107)
Currency exchange rate changes and other	10	0
Divestiture	0	0
Projected benefit obligation at end of year	3,404	3,202	3,232
Change in plan assets:
Fair value of plan assets at beginning of year	2,661	2,479
Actual return on plan assets	64	243
Employer contributions	93	215
Employee contributions	0	0
Plan settlements	0	(168)
Benefits paid	(100)	(108)
Currency exchange rate changes and other	10	0
Divestiture	0	0
Fair value of plan assets at end of year	2,728	2,661	2,479
Funded status at end of year:
Fair value of plan assets	2,661	2,479	2,479	2,728	2,661
Benefit obligations	3,404	3,232	3,232	3,404	3,202
Underfunded status of the plans				(676)	(541)
Recognized liability				(676)	(541)
Amounts recognized on the consolidated balance sheets consist of:
Non-current assets				0	0
Current liabilities				(18)	(17)
Non-current liabilities				(658)	(524)
Recognized liability				(676)	(541)
Amounts recognized in accumulated other comprehensive loss:
Prior service cost (benefit)				2	2
Net actuarial loss				1,216	1,088
Ending balance				1,218	1,090
Non-U.S. Pension Benefits | Pension benefits
Defined Benefit Plan Disclosure [Line items]
Accumulated benefit obligation at end of year				1,621	1,580
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	1,791	1,734
Service cost	59	67	70
Interest cost	30	28	26
Employee contributions	12	12
Plan curtailments and settlements	(5)	(8)
Actuarial loss (gain)	119	(74)
Benefits paid	(49)	(51)
Currency exchange rate changes and other	(125)	146
Divestiture	0	(63)
Projected benefit obligation at end of year	1,832	1,791	1,734
Change in plan assets:
Fair value of plan assets at beginning of year	1,404	1,235
Actual return on plan assets	62	67
Employer contributions	78	90
Employee contributions	12	13
Plan settlements	(3)	(4)
Benefits paid	(49)	(51)
Currency exchange rate changes and other	(95)	108
Divestiture	0	(54)
Fair value of plan assets at end of year	1,409	1,404	1,235
Funded status at end of year:
Fair value of plan assets	1,409	1,235	1,235	1,409	1,404
Benefit obligations	$ 1,791	$ 1,791	$ 1,734	1,832	1,791
Underfunded status of the plans				(423)	(387)
Recognized liability				(423)	(387)
Amounts recognized on the consolidated balance sheets consist of:
Non-current assets				31	16
Current liabilities				(8)	(8)
Non-current liabilities				(446)	(395)
Recognized liability				(423)	(387)
Amounts recognized in accumulated other comprehensive loss:
Prior service cost (benefit)				(7)	(9)
Net actuarial loss				452	380
Ending balance				$ 445	$ 371