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Financing Arrangements - Additional Information (Detail) $ / shares in Units, shares in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 02, 2016 USD ($) | Feb. 29, 2016 USD ($) Extension | Apr. 29, 2016 USD ($) $ / shares shares | Apr. 24, 2015 USD ($) | Apr. 25, 2014 USD ($) $ / shares shares | Apr. 26, 2013 $ / shares shares | Jun. 10, 2008 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Short-term loan maturity date |  |  | Nov. 02, 2016 |  |  |  |
Notes issued, proceeds amount |  |  | $ 0 | $ 495,000,000 | $ 0 |  |
Short-term loan | $ 870,000,000 |  | 870,000,000 | 0 | 0 |  |
Repayment of short-term loan |  |  | $ 20,000,000 | 0 | 0 |  |
Interest rate on short-term loan |  |  | 1.57% |  |  |  |
Sale leaseback transaction, net proceeds, financing obligations |  |  | $ 148,000,000 | 0 | $ 0 |  |
Properties Not Qualified For Sale Leaseback Accounting |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Sale leaseback transaction, net book value |  |  | 67,000,000 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, amount |  | $ 300,000,000 |  |  |  |  |
Credit facility, date expiry |  | Dec. 21, 2017 |  |  |  |  |
Credit facility, increase in facility |  | $ 50,000,000 |  |  |  |  |
Credit facility, number of extensions | Extension |  | 2 |  |  |  |  |
Credit facility, extensions period |  | 1 year |  |  |  |  |
Credit facility, outstanding borrowings |  |  | $ 0 |  |  |  |
Minimum | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, base rate |  |  | 0.20% |  |  |  |
Interest coverage ratio |  |  | 350.00% |  |  |  |
Maximum | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, base rate |  |  | 1.20% |  |  |  |
Leverage ratio |  |  | 300.00% |  |  |  |
Put Option | Common Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible Note Hedge number of shares contracted to sell | shares |  |  |  |  |  | 32 |
Convertible Note Hedge Exercise Price | $ / shares |  |  |  |  |  | $ 31.85 |
Convertible note hedge and warrants exercised and settled with shares of common stock | shares |  |  |  |  | (4) |  |
Warrant | Common Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible note hedge and warrants exercised and settled with shares of common stock | shares |  |  |  |  | 1 |  |
Outstanding warrants, number of shares | shares |  |  |  |  | 40 |  |
Exercise price of warrants | $ / shares |  |  |  |  | $ 41.28 |  |
Warrants exercised, number of shares | shares |  |  |  |  | 32 |  |
Warrant | Weighted Average | Common Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  |  |  | $ 43.09 |  |
Convertible Notes Payable |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes issued, interest rate |  |  |  |  |  |  | 1.75%
Short-term loan maturity date |  |  | Jun. 01, 2013 |  |  |  |
Notes issued, principal amount |  |  |  |  |  |  | $ 1,265,000,000
Conversion factor for convertible notes |  |  | 31.40 |  |  |  |
Denominator of principal amount upon which conversion rate is based |  |  | $ 1,000 |  |  |  |
Conversion price of notes to shares of common stock | $ / shares |  |  | $ 31.85 |  |  |  |
Conversion of convertible notes | shares |  |  | 5 |  |  |  |
Excess conversion value over principal amount of Convertible Notes |  |  | $ 179,000,000 |  |  |  |
Long-term debt |  |  |  |  |  |  | $ 1,017,000,000
Effective interest rate |  |  |  |  |  |  | 6.31%
Notes issued, issuance discount |  |  |  |  |  |  | $ 248,000,000
Issuance costs on Convertible Notes |  |  |  |  |  |  | 21,000,000
Equity Components Of Convertible Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Issuance costs on Convertible Notes |  |  |  |  |  |  | $ 5,000,000
Foreign Currency Sub Facility | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, amount |  | $ 100,000,000 |  |  |  |  |
Letter Of Credit Sub Facility | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, amount |  | 50,000,000 |  |  |  |  |
Swingline Sub Facility | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, amount |  | $ 10,000,000 |  |  |  |  |
Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes issued, principal amount |  |  | 1,500,000,000 | 1,500,000,000 |  |  |
Notes issued, issuance discount |  |  | $ 4,000,000 | 5,000,000 |  |  |
Senior Notes | Due 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes issued, interest rate |  |  | 3.375% |  |  |  |
Short-term loan maturity date |  |  | Jun. 15, 2021 |  |  |  |
Notes issued, proceeds amount |  |  | $ 495,000,000 |  |  |  |
Notes issued, principal amount |  |  | $ 500,000,000 | $ 500,000,000 |  |  |
Effective interest rate |  |  | 3.54% | 3.54% |  |  |
Senior Notes | Due 2017 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes issued, interest rate |  |  | 2.00% |  |  |  |
Notes issued, principal amount |  |  | $ 750,000,000 | $ 750,000,000 |  |  |
Effective interest rate |  |  | 2.25% | 2.25% |  |  |
Senior Notes | Due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes issued, interest rate |  |  | 3.25% |  |  |  |
Notes issued, principal amount |  |  | $ 250,000,000 | $ 250,000,000 |  |  |
Effective interest rate |  |  | 3.43% | 3.43% |  |  |

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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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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