Financial Instruments - Activity Related to the Company's Investment Portfolio and Debt Securities Contractual Maturities (Details) - USD ($) $ in Millions	3 Months Ended
Jul. 30, 2021	Jul. 31, 2020	Apr. 30, 2021
Activities Related to Debt Securities Portfolio
Proceeds from sales	$ 2,272	$ 2,403
Gross realized gains	4	5
Gross realized losses	(2)	$ (6)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Due in one year or less	2,170
Due after one year through five years	2,978
Due after five years through ten years	1,817
Due after ten years	660
Total	$ 7,624		$ 7,257

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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