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Financing Arrangements - Carrying Value of Long-Term Debt (Detail) - USD ($) $ in Millions	Apr. 27, 2018	Apr. 28, 2017
Debt Instrument [Line Items]
Total senior notes	$ 1,541	$ 1,493
Less: Current portion of long-term debt	0	(749)
Total long-term debt	1,541	744
Senior Notes
Debt Instrument [Line Items]
Total principal amount	1,550	1,500
Unamortized discount and issuance costs	(9)	(7)
Senior Notes | Due December 2017
Debt Instrument [Line Items]
Total principal amount	0	$ 750
Debt Instrument, Effective Interest Rate		2.25%
Senior Notes | Due September 2019
Debt Instrument [Line Items]
Total principal amount	$ 400	$ 0
Debt Instrument, Effective Interest Rate	2.32%
Senior Notes | Due June 2021
Debt Instrument [Line Items]
Total principal amount	$ 500	$ 500
Debt Instrument, Effective Interest Rate	3.54%	3.54%
Senior Notes | Due December 2022
Debt Instrument [Line Items]
Total principal amount	$ 250	$ 250
Debt Instrument, Effective Interest Rate	3.43%	3.43%
Senior Notes | Due September 2024
Debt Instrument [Line Items]
Total principal amount	$ 400	$ 0
Debt Instrument, Effective Interest Rate	3.42%

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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