Derivatives and Currency Exchange Risk Management - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Apr. 24, 2020	Apr. 26, 2019
Derivative assets:
Gross Amount of Recognized Assets (Liabilities)	$ 402	$ 365
Gross Amount Not Offset on the Balance Sheet, Financial Instruments	(17)	(9)
Gross Amount Not Offset on the Balance Sheet, Cash Collateral (Received) Posted	(48)	(44)
Net Amount	337	312
Derivative liabilities:
Gross Amount of Recognized Assets (Liabilities)	(42)	(19)
Gross Amount Not Offset on the Balance Sheet, Financial Instruments	17	9
Gross Amount Not Offset on the Balance Sheet, Cash Collateral (Received) Posted	0	0
Net Amount	(25)	(10)
Total
Gross Amount of Recognized Assets (Liabilities)	360	346
Gross Amount Not Offset on the Balance Sheet, Financial Instruments	0	0
Gross Amount Not Offset on the Balance Sheet, Cash Collateral (Received) Posted	(48)	(44)
Net Amount	312	302
Currency exchange rate contracts
Derivative assets:
Gross Amount of Recognized Assets (Liabilities)	399	335
Gross Amount Not Offset on the Balance Sheet, Financial Instruments	(17)	(9)
Gross Amount Not Offset on the Balance Sheet, Cash Collateral (Received) Posted	(48)	(43)
Net Amount	334	283
Derivative liabilities:
Gross Amount of Recognized Assets (Liabilities)	(17)	(19)
Gross Amount Not Offset on the Balance Sheet, Financial Instruments	17	9
Gross Amount Not Offset on the Balance Sheet, Cash Collateral (Received) Posted	0	0
Net Amount	0	(10)
Interest rate contracts
Derivative assets:
Gross Amount of Recognized Assets (Liabilities)		9
Gross Amount Not Offset on the Balance Sheet, Financial Instruments		0
Gross Amount Not Offset on the Balance Sheet, Cash Collateral (Received) Posted		(1)
Net Amount		8
Total return swaps
Derivative assets:
Gross Amount of Recognized Assets (Liabilities)		15
Gross Amount Not Offset on the Balance Sheet, Financial Instruments		0
Gross Amount Not Offset on the Balance Sheet, Cash Collateral (Received) Posted		0
Net Amount		15
Derivative liabilities:
Gross Amount of Recognized Assets (Liabilities)	(25)
Gross Amount Not Offset on the Balance Sheet, Financial Instruments	0
Gross Amount Not Offset on the Balance Sheet, Cash Collateral (Received) Posted	0
Net Amount	(25)
Cross-currency interest rate contracts
Derivative assets:
Gross Amount of Recognized Assets (Liabilities)	3	6
Gross Amount Not Offset on the Balance Sheet, Financial Instruments	0	0
Gross Amount Not Offset on the Balance Sheet, Cash Collateral (Received) Posted	0	0
Net Amount	$ 3	$ 6

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Derivative Asset (Liability), Fair Value, Gross Asset (Liability)

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Derivative Assets and Liabilities, Net, Collateral, Obligation to Return Cash

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Derivative Assets and Liabilities, Net, Not Offset, Policy Election Deduction

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Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset, deducted from derivative assets.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were offset against collateral under a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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