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Financial Instruments - Investments by Category and Related Balance Sheet Classification (Details) - USD ($) $ in Millions | Oct. 30, 2020 | Apr. 24, 2020
--- | --- | ---
Available-for-sale securities: |  |
Cost | $ 6,870 | $ 6,847
Unrealized Gains | 196 | 135
Unrealized Losses | (59) | (141)
Fair Value | 7,007 | 6,841
Held-to-maturity securities: |  |
Fair Value | 886 |
Total debt securities |  |
Cost | 7,756 |
Unrealized Gains | 196 |
Unrealized Losses | (59) |
Fair Value | 7,893 |
Investments |  |
Available-for-sale securities: |  |
Fair Value | 6,971 | 6,808
Total debt securities |  |
Fair Value | 7,857 |
Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 36 | 33
Total debt securities |  |
Fair Value | 36 |
Level 2 |  |
Available-for-sale securities: |  |
Cost | 6,337 | 6,269
Unrealized Gains | 157 | 88
Unrealized Losses | (59) | (138)
Fair Value | 6,435 | 6,219
Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 6,435 | 6,219
Level 2 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Corporate debt securities | Level 2 |  |
Available-for-sale securities: |  |
Cost | 4,234 | 4,285
Unrealized Gains | 124 | 66
Unrealized Losses | (32) | (90)
Fair Value | 4,326 | 4,261
Corporate debt securities | Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 4,326 | 4,261
Corporate debt securities | Level 2 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
U.S. government and agency securities | Level 1 |  |
Available-for-sale securities: |  |
Cost | 497 | 542
Unrealized Gains | 39 | 47
Unrealized Losses | 0 | 0
Fair Value | 536 | 589
U.S. government and agency securities | Level 1 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 536 | 589
U.S. government and agency securities | Level 1 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
U.S. government and agency securities | Level 2 |  |
Available-for-sale securities: |  |
Cost | 888 | 746
Unrealized Gains | 1 | 1
Unrealized Losses | (1) | 0
Fair Value | 888 | 747
U.S. government and agency securities | Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 888 | 747
U.S. government and agency securities | Level 2 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Mortgage-backed securities | Level 2 |  |
Available-for-sale securities: |  |
Cost | 661 | 705
Unrealized Gains | 27 | 20
Unrealized Losses | (19) | (28)
Fair Value | 669 | 697
Mortgage-backed securities | Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 669 | 697
Mortgage-backed securities | Level 2 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Non-U.S. government and agency securities | Level 2 |  |
Available-for-sale securities: |  |
Cost | 36 | 34
Unrealized Gains | 1 | 0
Unrealized Losses | 0 | 0
Fair Value | 37 | 34
Non-U.S. government and agency securities | Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 37 | 34
Non-U.S. government and agency securities | Level 2 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Other asset-backed securities | Level 2 |  |
Available-for-sale securities: |  |
Cost | 518 | 499
Unrealized Gains | 4 | 1
Unrealized Losses | (7) | (20)
Fair Value | 515 | 480
Other asset-backed securities | Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 515 | 480
Other asset-backed securities | Level 2 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Auction rate securities | Level 3 |  |
Available-for-sale securities: |  |
Cost | 36 | 36
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | (3)
Fair Value | 36 | 33
Auction rate securities | Level 3 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Auction rate securities | Level 3 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 36 | $ 33
Time deposit | Level 2 |  |
Held-to-maturity securities: |  |
Cost | 886 |
Unrealized Gains | 0 |
Unrealized Losses | 0 |
Fair Value | 886 |
Time deposit | Level 2 | Investments |  |
Held-to-maturity securities: |  |
Fair Value | 886 |
Time deposit | Level 2 | Other Assets |  |
Held-to-maturity securities: |  |
Fair Value | $ 0 |

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