Retirement Benefit Plans - Change in Benefit Obligation and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 24, 2020	Apr. 26, 2019	Apr. 27, 2018	Apr. 24, 2020	Apr. 26, 2019
Funded status at end of year:
Underfunded status of the plans				$ (1,400)	$ (1,100)
Amounts recognized on the consolidated balance sheets consist of:
Non-current liabilities				(1,910)	(1,651)
Pension benefits
Plans with accumulated benefit obligations in excess of plan assets
Accumulated benefit obligation				5,105	4,683
Projected benefit obligation				5,252	4,822
Plan assets at fair value				4,074	3,829
Plans with projected benefit obligations in excess of plan assets
Projected benefit obligation				5,700	4,963
Plan assets at fair value				4,331	3,833
U.S. Pension Benefits | Pension benefits
Defined Benefit Plan Disclosure [Line items]
Accumulated benefit obligation at end of year				3,440	3,121
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$ 3,404	$ 3,202
Service cost	106	109	$ 116
Interest cost	126	129	117
Employee contributions	0	0
Plan curtailments and settlements	(94)	0
Actuarial loss	300	54
Benefits paid	(111)	(100)
Currency exchange rate changes and other	(8)	10
Projected benefit obligation at end of year	3,723	3,404	3,202
Change in plan assets:
Fair value of plan assets at beginning of year	2,728	2,661
Actual return on plan assets	(72)	64
Employer contributions	444	93
Employee contributions	0	0
Plan settlements	0	0
Benefits paid	(111)	(100)
Currency exchange rate changes and other	(7)	10
Fair value of plan assets at end of year	2,982	2,728	2,661
Funded status at end of year:
Fair value of plan assets	2,982	2,661	2,661	2,982	2,728
Benefit obligations	3,404	3,404	3,202	3,723	3,404
Underfunded status of the plans				(741)	(676)
Recognized liability				(741)	(676)
Amounts recognized on the consolidated balance sheets consist of:
Non-current assets				0	0
Current liabilities				(17)	(18)
Non-current liabilities				(724)	(658)
Recognized liability				(741)	(676)
Amounts recognized in accumulated other comprehensive loss:
Prior service cost (benefit)				1	2
Net actuarial loss				1,662	1,216
Ending balance				1,663	1,218
Non-U.S. Pension Benefits | Pension benefits
Defined Benefit Plan Disclosure [Line items]
Accumulated benefit obligation at end of year				1,785	1,621
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	1,832	1,791
Service cost	59	59	67
Interest cost	28	30	28
Employee contributions	11	12
Plan curtailments and settlements	(2)	(5)
Actuarial loss	180	119
Benefits paid	(55)	(49)
Currency exchange rate changes and other	(29)	(125)
Projected benefit obligation at end of year	2,024	1,832	1,791
Change in plan assets:
Fair value of plan assets at beginning of year	1,409	1,404
Actual return on plan assets	2	62
Employer contributions	54	78
Employee contributions	11	12
Plan settlements	(2)	(3)
Benefits paid	(55)	(49)
Currency exchange rate changes and other	(15)	(95)
Fair value of plan assets at end of year	1,404	1,409	1,404
Funded status at end of year:
Fair value of plan assets	1,409	1,409	1,404	1,404	1,409
Benefit obligations	$ 1,832	$ 1,832	$ 1,791	2,024	1,832
Underfunded status of the plans				(620)	(423)
Recognized liability				(620)	(423)
Amounts recognized on the consolidated balance sheets consist of:
Non-current assets				7	31
Current liabilities				(6)	(8)
Non-current liabilities				(621)	(446)
Recognized liability				(620)	(423)
Amounts recognized in accumulated other comprehensive loss:
Prior service cost (benefit)				7	(7)
Net actuarial loss				663	452
Ending balance				$ 670	$ 445