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Financing Arrangements - Additional Information (Detail)			12 Months Ended
	Sep. 27, 2019 USD ($)	Jul. 17, 2017 USD ($) Extension	Apr. 24, 2020 USD ($)	Apr. 26, 2019 USD ($)	Apr. 27, 2018 USD ($)
Debt Instrument [Line Items]
Non-cash sale of properties, net book value					$ 54,000,000
Non-cash extinguishment of financing obligations			$ 0	$ 0	130,000,000
Gain on sale of properties					76,000,000
Sale leaseback transaction, remaining financing obligations				0	$ 0
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, amount		$ 1,000,000,000.0
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			$ 523,000,000	$ 249,000,000
Weighted-average interest rates			2.01%	2.73%
Proceeds from issuance of commercial paper notes with original maturities greater than three months			$ 111,000,000
Repayment of commercial paper notes with original maturities greater than three months			$ 10,000,000
Commercial Paper | Maximum
Debt Instrument [Line Items]
Notes issued, principal amount		$ 1,000,000,000.0
Debt instrument maturity period		397 days	3 months	3 months
Senior Notes
Debt Instrument [Line Items]
Notes issued, principal amount			$ 1,150,000,000	$ 1,550,000,000
Senior Notes | Due September 2019
Debt Instrument [Line Items]
Notes issued, principal amount			0	400,000,000
Notes issued, interest rate	2.00%
Extinguishment of debt amount	$ 400,000,000
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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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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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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