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Financial Instruments - Available-For-Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Jan. 28, 2022
Apr. 30, 2021
Fair Value    
Less than 12 months $ 0 $ 946
More than 12 months 2,858 4,423
Unrealized Losses    
Less than 12 months 0 (10)
More than 12 months (79) (32)
U.S. government and agency securities    
Fair Value    
Less than 12 months 0 946
More than 12 months 551 0
Unrealized Losses    
Less than 12 months 0 (10)
More than 12 months (19) 0
Corporate debt securities    
Fair Value    
Less than 12 months 0 0
More than 12 months 1,676 3,209
Unrealized Losses    
Less than 12 months 0 0
More than 12 months (40) (13)
Mortgage-backed securities    
Fair Value    
Less than 12 months 0 0
More than 12 months 289 650
Unrealized Losses    
Less than 12 months 0 0
More than 12 months (15) (16)
Other asset-backed securities    
Fair Value    
Less than 12 months 0 0
More than 12 months 309 531
Unrealized Losses    
Less than 12 months 0 0
More than 12 months (2) (1)
Auction rate securities    
Fair Value    
Less than 12 months 0 0
More than 12 months 33 33
Unrealized Losses    
Less than 12 months 0 0
More than 12 months $ (3) $ (3)