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Financial Instruments - Investments by Category and Related Balance Sheet Classification (Details) - USD ($) $ in Millions | Jul. 28, 2017 | Apr. 28, 2017
--- | --- | ---
Total available-for sale securities and investments measured at net asset value: |  |
Cost | $ 8,621 | $ 9,008
Unrealized Gains | 139 | 127
Unrealized Losses | (217) | (246)
Fair Value | 8,543 | 8,889
Cost method, equity method, and other investments: |  |
Cost | 627 | 589
Total investments [Abstract] |  |
Cost | 9,248 | 9,597
Unrealized Gains | 139 | 127
Unrealized Losses | (217) | (246)
Fair Value | 8,543 | 8,889
Investments |  |
Total available-for sale securities and investments measured at net asset value: |  |
Fair Value | 8,397 | 8,741
Cost method, equity method, and other investments: |  |
Cost | 0 | 0
Total investments [Abstract] |  |
Fair Value | 8,397 | 8,741
Other Assets |  |
Total available-for sale securities and investments measured at net asset value: |  |
Fair Value | 146 | 148
Cost method, equity method, and other investments: |  |
Cost | 627 | 589
Total investments [Abstract] |  |
Fair Value | 773 | 737
Level 1 |  |
Available-for-sale securities: |  |
Cost | 708 | 671
Unrealized Gains | 49 | 51
Unrealized Losses | (6) | (9)
Fair Value | 751 | 713
Level 1 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 650 | 610
Level 1 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 101 | 103
Level 2 |  |
Available-for-sale securities: |  |
Cost | 7,368 | 7,792
Unrealized Gains | 90 | 76
Unrealized Losses | (202) | (228)
Fair Value | 7,256 | 7,640
Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 7,256 | 7,640
Level 2 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Level 3 |  |
Available-for-sale securities: |  |
Cost | 48 | 48
Unrealized Gains | 0 | 0
Unrealized Losses | (3) | (3)
Fair Value | 45 | 45
Cost method, equity method, and other investments: |  |
Cost | 627 | 589
Level 3 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Cost method, equity method, and other investments: |  |
Cost | 0 | 0
Level 3 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 45 | 45
Cost method, equity method, and other investments: |  |
Cost | 627 | 589
Corporate debt securities | Level 2 |  |
Available-for-sale securities: |  |
Cost | 4,157 | 4,643
Unrealized Gains | 73 | 62
Unrealized Losses | (18) | (23)
Fair Value | 4,212 | 4,682
Corporate debt securities | Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 4,212 | 4,682
Corporate debt securities | Level 2 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Corporate debt securities | Level 3 |  |
Available-for-sale securities: |  |
Cost | 1 | 1
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 1 | 1
Corporate debt securities | Level 3 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Corporate debt securities | Level 3 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 1 | 1
U.S. government and agency securities | Level 1 |  |
Available-for-sale securities: |  |
Cost | 653 | 613
Unrealized Gains | 1 | 2
Unrealized Losses | (4) | (5)
Fair Value | 650 | 610
U.S. government and agency securities | Level 1 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 650 | 610
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 | 854 | 860
Unrealized Gains | 0 | 0
Unrealized Losses | (9) | (10)
Fair Value | 845 | 850
U.S. government and agency securities | Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 845 | 850
U.S. government and agency securities | Level 2 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Marketable equity securities | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 101 | 103
Marketable equity securities | Level 1 |  |
Available-for-sale securities: |  |
Cost | 55 | 58
Unrealized Gains | 48 | 49
Unrealized Losses | (2) | (4)
Fair Value | 101 | 103
Marketable equity securities | Level 1 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Marketable equity securities | Level 1 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 101 | 103
Mortgage-backed securities | Level 2 |  |
Available-for-sale securities: |  |
Cost | 804 | 766
Unrealized Gains | 9 | 9
Unrealized Losses | (16) | (16)
Fair Value | 797 | 759
Mortgage-backed securities | Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 797 | 759
Mortgage-backed securities | Level 2 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Foreign government and agency securities | Level 2 |  |
Available-for-sale securities: |  |
Cost | 49 | 49
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 49 | 49
Foreign government and agency securities | Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 49 | 49
Foreign 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 | 258 | 228
Unrealized Gains | 1 | 1
Unrealized Losses | (1) | (1)
Fair Value | 258 | 228
Other asset-backed securities | Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 258 | 228
Other asset-backed securities | Level 2 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Debt funds |  |
Investments measured at net asset value: |  |
Cost | 497 | 497
Unrealized Gains | 0 | 0
Unrealized Losses | (6) | (6)
Fair Value | 491 | 491
Debt funds | Investments |  |
Investments measured at net asset value: |  |
Fair Value | 491 | 491
Debt funds | Other Assets |  |
Investments measured at net asset value: |  |
Fair Value | 0 | 0
Debt funds | Level 2 |  |
Available-for-sale securities: |  |
Cost | 1,246 | 1,246
Unrealized Gains | 7 | 4
Unrealized Losses | (158) | (178)
Fair Value | 1,095 | 1,072
Debt funds | Level 2 | Investments |  |
Available-for-sale securities: |  |
Fair Value | 1,095 | 1,072
Debt funds | Level 2 | Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Auction rate securities | Level 3 |  |
Available-for-sale securities: |  |
Cost | 47 | 47
Unrealized Gains | 0 | 0
Unrealized Losses | (3) | (3)
Fair Value | 44 | 44
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 | $ 44 | $ 44

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