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Financial Instruments (Tables)
 6 Months Ended
Oct. 30, 2020
Investments [Abstract]  
Investments by Category and Related Balance Sheet Classification, Debt Securities The following tables summarize the Company's investments in available-for-sale and held-to-maturity debt securities by significant investment category and the related consolidated balance sheet classification at October 30, 2020 and April 24, 2020:    
October 30, 2020
ValuationBalance Sheet Classification
(in millions)CostUnrealized
Gains		Unrealized
Losses		Fair ValueInvestmentsOther Assets
Available-for-sale securities:
Level 1:
U.S. government and agency securities$497 $39 $— $536 $536 $— 
Level 2:
Corporate debt securities4,234 124 (32)4,326 4,326 — 
U.S. government and agency securities888 1 (1)888 888 — 
Mortgage-backed securities661 27 (19)669 669 — 
Non-U.S. government and agency securities36 1 — 37 37 — 
Other asset-backed securities518 4 (7)515 515 — 
Total Level 26,337 157 (59)6,435 6,435 — 
Level 3:
Auction rate securities36 — — 36 — 36 
Total available-for-sale debt securities6,870 196 (59)7,007 6,971 36 
Held-to-maturity securities:
Level 2:
Time deposit886 — — 886 886 — 
Total debt securities$7,756 $196 $(59)$7,893 $7,857 $36 

April 24, 2020
ValuationBalance Sheet Classification
(in millions)CostUnrealized
Gains		Unrealized
Losses		Fair ValueInvestmentsOther Assets
Level 1:
U.S. government and agency securities$542 $47 $— $589 $589 $— 
Level 2:
Corporate debt securities4,285 66 (90)4,261 4,261 — 
U.S. government and agency securities746 1 — 747 747 — 
Mortgage-backed securities705 20 (28)697 697 — 
Non-U.S. government and agency securities34 — — 34 34 — 
Other asset-backed securities499 1 (20)480 480 — 
Total Level 26,269 88 (138)6,219 6,219 — 
Level 3:
Auction rate securities36 — (3)33 — 33 
Total available-for-sale debt securities$6,847 $135 $(141)$6,841 $6,808 $33 
Available-For-Sale Debt Securities in Continuous Unrealized Loss Position
The following tables present the gross unrealized losses and fair values of the Company’s available-for-sale debt securities that have been in a continuous unrealized loss position deemed to be temporary, aggregated by investment category at October 30, 2020 and April 24, 2020:
 October 30, 2020
 Less than 12 monthsMore than 12 months
(in millions)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
U.S. government and agency securities$— $— $196 $(1)
Corporate debt securities5 — 858 (32)
Mortgage-backed securities25 (3)119 (16)
Other asset-backed securities8 — 347 (7)
Total$38 $(3)$1,520 $(56)

 April 24, 2020
 Less than 12 monthsMore than 12 months
(in millions)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
Corporate debt securities$1,368 $(2)$2,893 $(88)
Mortgage-backed securities35 (1)663 (27)
Other asset-backed securities17 — 463 (20)
Auction rate securities33 (3)— — 
Total$1,453 $(6)$4,019 $(135)
Activity Related to the Company's Available-for-Sale Debt Securities Portfolio
Activity related to the Company’s available-for-sale debt securities portfolio is as follows:
 Three months endedSix months ended
(in millions)October 30, 2020October 25, 2019October 30, 2020October 25, 2019
Proceeds from sales$1,932 $1,691 $4,335 $3,258 
Gross realized gains3 4 8 8 
Gross realized losses(1)(4)(7)(12)
Debt Securities Contractual Maturities
The October 30, 2020 balance of available-for-sale and held-to-maturity debt securities by contractual maturity is shown in the following table. Within the table, maturities of mortgage-backed securities have been allocated based upon timing of estimated cash flows assuming no change in the current interest rate environment. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
October 30, 2020
(in millions)Available-For-SaleHeld-To-Maturity
Due in one year or less$1,930 $886 
Due after one year through five years3,315 — 
Due after five years through ten years1,695 — 
Due after ten years67 — 
Total$7,007 $886 
Summary of Equity and Other Investments
The following table summarizes the Company's equity and other investments at October 30, 2020 and April 24, 2020, which are classified as other assets in the consolidated balance sheets:
(in millions)October 30, 2020April 24, 2020
Investments with readily determinable fair value (marketable equity securities)$25 $18 
Investments without readily determinable fair values478391
Equity method and other investments7471
Total equity and other investments$577 $480 
Activity Related to the Company's Equity and Other Investments Portfolio
The table below includes activity related to the Company’s portfolio of equity and other investments. Gains and losses on equity and other investments are recognized in other non-operating income, net in the consolidated statements of income.
 Three months endedSix months ended
(in millions)October 30, 2020October 25, 2019October 30, 2020October 25, 2019
Proceeds from sales$2 $— $2 $2 
Gross gains2 14 14 14 
Gross losses(2)— (2)— 
Impairment losses recognized— (2)(2)(3)