Cash, Cash Equivalents and Investments (Contractual Maturities) (Details) $ in Millions	Oct. 25, 2020 USD ($)
Cost
Due in one year or less, cost	$ 367
Due after one through five years, cost	878
Due after five years, cost	0
No single maturity date, cost	602
Cost of fixed income securities	1,847
Estimated Fair Value
Due in one year or less, estimated fair value	369
Due after one through five years, estimated fair value	893
Due after five years, estimated fair value	0
No single maturity date, estimated fair value	663
Estimated fair value of short-term and long-term investments	$ 1,925

Amortized cost 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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Amortized cost 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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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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