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Financial Instruments - AFS in Continuous Loss Position (Details) - USD ($)
$ in Millions
Apr. 24, 2020
Apr. 26, 2019
Fair Value    
Less than 12 months $ 1,453 $ 1,075
More than 12 months 4,019 2,181
Unrealized Losses    
Less than 12 months (6) (9)
More than 12 months (135) (52)
U.S. government and agency securities    
Fair Value    
Less than 12 months   130
More than 12 months   649
Unrealized Losses    
Less than 12 months   (1)
More than 12 months   (13)
Corporate debt securities    
Fair Value    
Less than 12 months 1,368 582
More than 12 months 2,893 1,153
Unrealized Losses    
Less than 12 months (2) (5)
More than 12 months (88) (16)
Mortgage-backed securities    
Fair Value    
Less than 12 months 35 73
More than 12 months 663 250
Unrealized Losses    
Less than 12 months (1) (1)
More than 12 months (27) (19)
Other asset-backed securities    
Fair Value    
Less than 12 months 17 290
More than 12 months 463 85
Unrealized Losses    
Less than 12 months 0 (2)
More than 12 months (20) (1)
Auction rate securities    
Fair Value    
Less than 12 months 33 0
More than 12 months 0 44
Unrealized Losses    
Less than 12 months (3) 0
More than 12 months $ 0 $ (3)