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Financing Arrangements - Additional Information (Detail)		12 Months Ended
	Jul. 17, 2017 USD ($) Extension	Apr. 26, 2019 USD ($)	Apr. 27, 2018 USD ($)	Apr. 28, 2017 USD ($)
Debt Instrument [Line Items]
Non-cash sale of properties, net book value			$ 54,000,000	$ 9,000,000
Non-cash extinguishment of financing obligations			130,000,000	19,000,000
Gain on sale of properties			76,000,000	$ 10,000,000
Sale leaseback transaction, remaining financing obligations		$ 0	0
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, amount	$ 1,000,000,000
Credit facility, date expiry	Dec. 10, 2021
Credit facility, increase in facility	$ 300,000,000
Credit facility, number of extensions | Extension	2
Credit facility, extensions period	1 year
Credit facility, amounts drawn		0
Revolving Credit Facility | Letter Of Credit Sub Facility
Debt Instrument [Line Items]
Credit facility, amount	$ 50,000,000
Commercial Paper
Debt Instrument [Line Items]
Notes issued, principal amount		$ 249,000,000	$ 385,000,000
Weighted-average interest rate		2.73%	2.29%
Commercial Paper | Maximum
Debt Instrument [Line Items]
Notes issued, principal amount	$ 1,000,000,000
Debt instrument maturity period	397 days	38 days	32 days
Commercial Paper | Minimum
Debt Instrument [Line Items]
Debt instrument maturity period		27 days	19 days
Senior Notes
Debt Instrument [Line Items]
Notes issued, principal amount		$ 1,550,000,000	$ 1,550,000,000
Senior Notes | Due September 2019
Debt Instrument [Line Items]
Notes issued, principal amount		$ 400,000,000	400,000,000
Notes issued, interest rate		2.00%
Senior Notes | Due September 2024
Debt Instrument [Line Items]
Notes issued, principal amount		$ 400,000,000	400,000,000
Notes issued, interest rate		3.30%
Senior Notes | Due June 2021
Debt Instrument [Line Items]
Notes issued, principal amount		$ 500,000,000	500,000,000
Notes issued, interest rate		3.375%
Senior Notes | Due December 2022
Debt Instrument [Line Items]
Notes issued, principal amount		$ 250,000,000	$ 250,000,000
Notes issued, interest rate		3.25%

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Amount potentially available for additional borrowing on the Line of Credit Facility.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The value of notes retired (or transferred to another entity) in noncash investing or financing transactions.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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