Debt - Narrative (Details)	12 Months Ended
Jan. 27, 2019 USD ($) instrument shares
Debt Instrument [Line Items]
Notice period	30 days
Net proceeds from debt issuance	$ 1,980,000,000
Convertible notes outstanding	$ 0
Exercise of convertible note hedges (in shares) \| shares	57,000,000
Extinguishment of debt to date	$ 1,500,000,000
Note hedges outstanding \| instrument	0
Additional borrowing capacity from Revolving Credit Facility	$ 425,000,000
Outstanding commercial paper	0
Revolving Credit Facility
Debt Instrument [Line Items]
Current borrowing capacity	575,000,000
Line of credit outstanding	0
Commercial Paper
Debt Instrument [Line Items]
Current borrowing capacity	575,000,000
Convertible Debt
Debt Instrument [Line Items]
Face amount of debt issued	1,500,000,000
Repayment of debt	$ 16,000,000
Convertible debt conversion (in shares) \| shares	714,000
2.20% Notes Due 2021
Debt Instrument [Line Items]
Face amount of debt issued	$ 1,000,000,000
Interest rate (as percent)	2.20%
3.20% Notes Due 2026
Debt Instrument [Line Items]
Face amount of debt issued	$ 1,000,000,000
Interest rate (as percent)	3.20%

Additional borrowing capacity on Revolving Credit Facility

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Debt Instrument, Redemption, Notice Period

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Gross amount of debt extinguished to date

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Shares received from Note Hedges

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- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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- Definition

The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Gross amount of debt extinguished.

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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.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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