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Financing Arrangements - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 12, 2016 USD ($) Extension | Feb. 29, 2016 USD ($) | Jan. 27, 2017 USD ($) | Apr. 28, 2017 USD ($) | Apr. 29, 2016 USD ($) | Apr. 24, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Short-term loan |  | $ 870,000,000 |  | $ 0 | $ 870,000,000 | $ 0
Short-term loan maturity date |  |  |  | Nov. 02, 2016 |  |
Non-cash sale of properties, net book value |  |  | $ 9,000,000 | $ 9,000,000 |  |
Non-cash extinguishment of financing obligations |  |  | 19,000,000 | 19,000,000 | 0 | 0
Gain on sale of properties |  |  | $ 10,000,000 | 10,000,000 | 51,000,000 | $ 0
Sale leaseback transaction, remaining financing obligations |  |  |  | 130,000,000 | 19,000,000 |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility, amount | $ 600,000,000 |  |  |  |  |
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, outstanding borrowings |  |  |  | 0 |  |
Revolving Credit Facility | Letter Of Credit Sub Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility, amount | $ 50,000,000 |  |  |  |  |
Credit facility, outstanding letters of credit |  |  |  | 0 |  |
Commercial Paper |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes issued, principal amount |  |  |  | $ 500,000,000 |  |
Weighted-average interest rate |  |  |  | 1.26% |  |
Commercial Paper | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes issued, principal amount | $ 600,000,000 |  |  |  |  |
Debt instrument maturity period | 397 days |  |  | 38 days |  |
Commercial Paper | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument maturity period |  |  |  | 7 days |  |
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes issued, principal amount |  |  |  | $ 1,500,000,000 | 1,500,000,000 |
Senior Notes | Due June 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes issued, interest rate |  |  |  | 3.375% |  |
Notes issued, principal amount |  |  |  | $ 500,000,000 | 500,000,000 |
Senior Notes | Due December 2017 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes issued, interest rate |  |  |  | 2.00% |  |
Notes issued, principal amount |  |  |  | $ 750,000,000 | 750,000,000 |
Senior Notes | Due December 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes issued, interest rate |  |  |  | 3.25% |  |
Notes issued, principal amount |  |  |  | $ 250,000,000 | $ 250,000,000 |

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- Definition Number of extensions potentially available to the borrower under the line of credit facility. + References No definition available. + Details
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- Definition 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 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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