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Financing Arrangements - Additional Information (Detail)				1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 22, 2021 USD ($) Extension	Jul. 27, 2020 USD ($)	Jul. 17, 2017	Jun. 30, 2020 USD ($)	Jul. 31, 2020 USD ($)	Apr. 30, 2021 USD ($)	Apr. 24, 2020 USD ($)	Apr. 26, 2019 USD ($)	Jul. 31, 2017 USD ($)
Debt Instrument [Line Items]
Issuances of debt, net of issuance costs						$ 2,057,000,000	$ 111,000,000	$ 0
Commercial paper notes						0	522,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, amount	$ 1,000,000,000.0
Credit facility, maturity	Jan. 22, 2026
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
Issuances of debt, net of issuance costs						75,000,000	$ 111,000,000
Weighted-average interest rate							2.01%
Proceeds from repayments of debt						176,000,000	$ 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
Senior Notes
Debt Instrument [Line Items]
Notes issued, principal amount						2,650,000,000	$ 1,150,000,000
Issuances of debt, net of issuance costs				$ 2,000,000,000.0
Cash redemption premium					$ 13,000,000
Write-off of unamortized discount and issuance costs					1,000,000
Senior Notes | Other (Expense) Income, Net
Debt Instrument [Line Items]
Loss on extinguishment of debt					$ 14,000,000
Senior Notes | Due June 2025
Debt Instrument [Line Items]
Notes issued, principal amount				$ 750,000,000		750,000,000	0
Notes issued, interest rate				1.875%
Senior Notes | Due June 2027
Debt Instrument [Line Items]
Notes issued, principal amount				$ 550,000,000		550,000,000	0
Notes issued, interest rate		3.375%		2.375%
Extinguishment of debt amount		$ 513,000,000
Senior Notes | Due June 2030
Debt Instrument [Line Items]
Notes issued, principal amount				$ 700,000,000		700,000,000	0
Notes issued, interest rate				2.70%
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 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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