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Financing Arrangements - Additional Information (Detail)			12 Months Ended
	Nov. 03, 2017 USD ($)	Jul. 17, 2017 USD ($) Extension	Apr. 27, 2018 USD ($)	Apr. 28, 2017 USD ($)	Apr. 29, 2016 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	$ 0
Gain on sale of properties			76,000,000	10,000,000
Sale leaseback transaction, remaining financing obligations			0	130,000,000
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			$ 385,000,000	$ 500,000,000
Weighted-average interest rate			2.29%	1.26%
Commercial Paper | Maximum
Debt Instrument [Line Items]
Notes issued, principal amount		$ 1,000,000,000
Debt instrument maturity period		397 days	32 days	38 days
Commercial Paper | Minimum
Debt Instrument [Line Items]
Debt instrument maturity period			19 days	7 days
Senior Notes
Debt Instrument [Line Items]
Notes issued, principal amount			$ 1,550,000,000	$ 1,500,000,000
Proceeds from issuance of notes, net of discount and issuance costs			795,000,000
Senior Notes | Due September 2019
Debt Instrument [Line Items]
Notes issued, principal amount			$ 400,000,000	0
Notes issued, interest rate			2.00%
Notes due date			Sep. 27, 2019
Senior Notes | Due September 2024
Debt Instrument [Line Items]
Notes issued, principal amount			$ 400,000,000	0
Notes issued, interest rate			3.30%
Notes due date			Sep. 29, 2024
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%
Senior Notes | Due December 2017
Debt Instrument [Line Items]
Notes issued, principal amount			$ 0	$ 750,000,000
Notes issued, interest rate	2.00%
Notes due date, month and year	2017-12
Notes aggregate cash redemption price	$ 751,000,000
Notes repurchased date	Nov. 03, 2017

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