Stock Purchase and Award Plans , Restricted Stock Award Activity (Details) - Restricted stock - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017
Units
Nonvested at beginning of period (in shares)	8,236
Granted (in shares)	2,812
Vested (in shares)	(2,397)
Forfeited (in shares)	(655)
Nonvested at end of period (in shares)	7,996	8,236
Wtd. Avg. Grant Price
Nonvested at beginning of period (in dollars per share)	$ 83.35
Granted (in dollars per share)	88.78	$ 83.88	$ 85.07
Vested (in dollars per share)	72.78
Forfeited (in dollars per share)	83.73
Nonvested at end of period (in dollars per share)	$ 88.40	$ 83.35
Fair value of restricted stock vested	$ 174	$ 160	$ 131
Tax benefit related to restricted stock vested	$ 45	$ 63	$ 76

Amount of tax benefit from exercise of option under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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