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Financial Instruments , Investments by Category and Related Balance Sheet Presentation, and AFS in Continuous Loss Position (Details) - USD ($) $ in Millions | Apr. 28, 2017 | Apr. 29, 2016
--- | --- | ---
Available-for-sale securities: |  |
Cost | $ 9,008 | $ 10,000
Unrealized Gains | 127 | 147
Unrealized Losses | (246) | (338)
Fair Value | 8,889 | 9,809
Trading securities: |  |
Cost |  | 65
Unrealized Gains |  | 15
Unrealized Losses |  | (1)
Fair Value |  | 79
Cost method, equity method, and other investments: |  |
Cost | 589 | 506
Total investments |  |
Cost | 9,597 | 10,571
Unrealized Gains | 127 | 162
Unrealized Losses | (246) | (339)
Fair Value | 8,889 | 9,888
AFS Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 2,749 | 1,975
Less than 12 Months, Unrealized Losses | (43) | (64)
More than 12 Months, Fair Value | 1,312 | 1,940
More than 12 Months, Unrealized Losses | (203) | (275)
U.S. government and agency securities |  |
AFS Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 896 | 308
Less than 12 Months, Unrealized Losses | (15) | (4)
More than 12 Months, Fair Value | 0 | 67
More than 12 Months, Unrealized Losses | 0 | (5)
Marketable equity securities |  |
AFS Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 14 | 45
Less than 12 Months, Unrealized Losses | (3) | (11)
More than 12 Months, Fair Value | 2 | 0
More than 12 Months, Unrealized Losses | (1) | 0
Corporate debt securities |  |
AFS Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 1,263 | 756
Less than 12 Months, Unrealized Losses | (19) | (18)
More than 12 Months, Fair Value | 46 | 136
More than 12 Months, Unrealized Losses | (4) | (6)
Mortgage-backed securities |  |
AFS Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 276 | 196
Less than 12 Months, Unrealized Losses | (4) | (5)
More than 12 Months, Fair Value | 95 | 92
More than 12 Months, Unrealized Losses | (12) | (5)
Other asset-backed securities |  |
AFS Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 127 |
Less than 12 Months, Unrealized Losses | (1) |
More than 12 Months, Fair Value | 0 |
More than 12 Months, Unrealized Losses | 0 |
Debt funds |  |
AFS Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 173 | 670
Less than 12 Months, Unrealized Losses | (1) | (26)
More than 12 Months, Fair Value | 1,125 | 1,601
More than 12 Months, Unrealized Losses | (183) | (256)
Auction rate securities |  |
AFS Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Losses | 0 | 0
More than 12 Months, Fair Value | 44 | 44
More than 12 Months, Unrealized Losses | (3) | (3)
Level 1 |  |
Available-for-sale securities: |  |
Cost | 671 | 867
Unrealized Gains | 51 | 35
Unrealized Losses | (9) | (12)
Fair Value | 713 | 890
Trading securities: |  |
Cost |  | 65
Unrealized Gains |  | 15
Unrealized Losses |  | (1)
Fair Value |  | 79
Level 1 | U.S. government and agency securities |  |
Available-for-sale securities: |  |
Cost | 613 | 792
Unrealized Gains | 2 | 14
Unrealized Losses | (5) | (1)
Fair Value | 610 | 805
Level 1 | Marketable equity securities |  |
Available-for-sale securities: |  |
Cost | 58 | 75
Unrealized Gains | 49 | 21
Unrealized Losses | (4) | (11)
Fair Value | 103 | 85
Level 1 | Exchange-traded funds |  |
Trading securities: |  |
Cost |  | 65
Unrealized Gains |  | 15
Unrealized Losses |  | (1)
Fair Value |  | 79
Level 2 |  |
Available-for-sale securities: |  |
Cost | 7,792 | 8,351
Unrealized Gains | 76 | 112
Unrealized Losses | (228) | (289)
Fair Value | 7,640 | 8,174
Level 2 | U.S. government and agency securities |  |
Available-for-sale securities: |  |
Cost | 860 | 902
Unrealized Gains | 0 | 2
Unrealized Losses | (10) | 0
Fair Value | 850 | 904
Level 2 | Corporate debt securities |  |
Available-for-sale securities: |  |
Cost | 4,643 | 3,935
Unrealized Gains | 62 | 85
Unrealized Losses | (23) | (24)
Fair Value | 4,682 | 3,996
Level 2 | Mortgage-backed securities |  |
Available-for-sale securities: |  |
Cost | 766 | 1,016
Unrealized Gains | 9 | 17
Unrealized Losses | (16) | (18)
Fair Value | 759 | 1,015
Level 2 | Non-U.S. government and agency securities |  |
Available-for-sale securities: |  |
Cost | 49 |
Unrealized Gains | 0 |
Unrealized Losses | 0 |
Fair Value | 49 |
Level 2 | Other asset-backed securities |  |
Available-for-sale securities: |  |
Cost | 228 | 192
Unrealized Gains | 1 | 3
Unrealized Losses | (1) | 0
Fair Value | 228 | 195
Level 2 | Debt funds |  |
Available-for-sale securities: |  |
Cost | 1,246 | 2,306
Unrealized Gains | 4 | 5
Unrealized Losses | (178) | (247)
Fair Value | 1,072 | 2,064
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 | 589 | 506
Level 3 | Corporate debt securities |  |
Available-for-sale securities: |  |
Cost | 1 | 1
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 1 | 1
Level 3 | Debt funds |  |
Available-for-sale securities: |  |
Cost | 497 | 734
Unrealized Gains | 0 | 0
Unrealized Losses | (6) | (34)
Fair Value | 491 | 700
Level 3 | Auction rate securities |  |
Available-for-sale securities: |  |
Cost | 47 | 47
Unrealized Gains | 0 | 0
Unrealized Losses | (3) | (3)
Fair Value | 44 | 44
Investments |  |
Available-for-sale securities: |  |
Fair Value | 8,741 | 9,679
Trading securities: |  |
Fair Value |  | 79
Cost method, equity method, and other investments: |  |
Cost | 0 | 0
Total investments |  |
Fair Value | 8,741 | 9,758
Investments | Level 1 |  |
Available-for-sale securities: |  |
Fair Value | 610 | 805
Trading securities: |  |
Fair Value |  | 79
Investments | Level 1 | U.S. government and agency securities |  |
Available-for-sale securities: |  |
Fair Value | 610 | 805
Investments | Level 1 | Marketable equity securities |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Investments | Level 1 | Exchange-traded funds |  |
Trading securities: |  |
Fair Value |  | 79
Investments | Level 2 |  |
Available-for-sale securities: |  |
Fair Value | 7,640 | 8,174
Investments | Level 2 | U.S. government and agency securities |  |
Available-for-sale securities: |  |
Fair Value | 850 | 904
Investments | Level 2 | Corporate debt securities |  |
Available-for-sale securities: |  |
Fair Value | 4,682 | 3,996
Investments | Level 2 | Mortgage-backed securities |  |
Available-for-sale securities: |  |
Fair Value | 759 | 1,015
Investments | Level 2 | Non-U.S. government and agency securities |  |
Available-for-sale securities: |  |
Fair Value | 49 |
Investments | Level 2 | Other asset-backed securities |  |
Available-for-sale securities: |  |
Fair Value | 228 | 195
Investments | Level 2 | Debt funds |  |
Available-for-sale securities: |  |
Fair Value | 1,072 | 2,064
Investments | Level 3 |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Cost method, equity method, and other investments: |  |
Cost | 0 | 0
Investments | Level 3 | Corporate debt securities |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Investments | Level 3 | Debt funds |  |
Available-for-sale securities: |  |
Investments measured at net asset value | 491 | 700
Investments | Level 3 | Auction rate securities |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Other Assets |  |
Available-for-sale securities: |  |
Fair Value | 148 | 130
Trading securities: |  |
Fair Value |  | 0
Cost method, equity method, and other investments: |  |
Cost | 589 | 506
Total investments |  |
Fair Value | 737 | 636
Other Assets | Marketable equity securities |  |
Available-for-sale securities: |  |
Fair Value | 103 | 85
Other Assets | Level 1 |  |
Available-for-sale securities: |  |
Fair Value | 103 | 85
Trading securities: |  |
Fair Value |  | 0
Other Assets | Level 1 | U.S. government and agency securities |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Other Assets | Level 1 | Marketable equity securities |  |
Available-for-sale securities: |  |
Fair Value | 103 | 85
Other Assets | Level 1 | Exchange-traded funds |  |
Trading securities: |  |
Fair Value |  | 0
Other Assets | Level 2 |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Other Assets | Level 2 | U.S. government and agency securities |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Other Assets | Level 2 | Corporate debt securities |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Other Assets | Level 2 | Mortgage-backed securities |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Other Assets | Level 2 | Non-U.S. government and agency securities |  |
Available-for-sale securities: |  |
Fair Value | 0 |
Other Assets | Level 2 | Other asset-backed securities |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Other Assets | Level 2 | Debt funds |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Other Assets | Level 3 |  |
Available-for-sale securities: |  |
Fair Value | 45 | 45
Cost method, equity method, and other investments: |  |
Cost | 589 | 506
Other Assets | Level 3 | Corporate debt securities |  |
Available-for-sale securities: |  |
Fair Value | 1 | 1
Other Assets | Level 3 | Debt funds |  |
Available-for-sale securities: |  |
Investments measured at net asset value | 0 | 0
Other Assets | Level 3 | Auction rate securities |  |
Available-for-sale securities: |  |
Fair Value | $ 44 | $ 44

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