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Financial Instruments - Investments by Category and Related Balance Sheet Presentation, and AFS in Continuous Loss Position (Details) - USD ($) $ in Millions | Oct. 30, 2015 | Apr. 24, 2015
--- | --- | ---
Available-for-sale securities: |  |
Cost | $ 15,276 | $ 14,734
Unrealized Gains | 105 | 205
Unrealized Losses | (409) | (193)
Fair Value | 14,972 | 14,746
Trading securities: |  |
Cost | 65 | 58
Unrealized Gains | 16 | 19
Unrealized Losses | 0 | 0
Fair Value | 81 | 77
Cost method, equity method, and other investments: |  |
Cost | 484 | 520
Total investments [Abstract] |  |
Cost | 15,825 | 15,312
Unrealized Gains | 121 | 224
Unrealized Losses | (409) | (193)
Fair Value | 15,053 | 14,823
AFS Continuous Unrealized Loss Position |  |
Less than 12 months, Fair Value | 5,916 | 2,941
Less than 12 months, Unrealized Losses | (161) | (141)
More than 12 months, Fair Value | 1,780 | 1,171
More than 12 months, Unrealized Losses | (248) | (52)
Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 14,770 | 14,560
Trading securities: |  |
Fair Value | 81 | 77
Cost method, equity method, and other investments: |  |
Cost | 0 | 0
Total investments [Abstract] |  |
Fair Value | 14,851 | 14,637
Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 202 | 186
Trading securities: |  |
Fair Value | 0 | 0
Cost method, equity method, and other investments: |  |
Cost | 484 | 520
Total investments [Abstract] |  |
Fair Value | 686 | 706
Level 1 [Member] |  |
Available-for-sale securities: |  |
Cost | 1,775 | 1,589
Unrealized Gains | 30 | 52
Unrealized Losses | (7) | (20)
Fair Value | 1,798 | 1,621
Trading securities: |  |
Cost | 65 | 58
Unrealized Gains | 16 | 19
Unrealized Losses | 0 | 0
Fair Value | 81 | 77
Level 1 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 1,699 | 1,541
Trading securities: |  |
Fair Value | 81 | 77
Level 1 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 99 | 80
Trading securities: |  |
Fair Value | 0 | 0
Level 2 [Member] |  |
Available-for-sale securities: |  |
Cost | 13,391 | 13,035
Unrealized Gains | 75 | 153
Unrealized Losses | (395) | (169)
Fair Value | 13,071 | 13,019
Level 2 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 13,071 | 13,019
Level 2 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Level 3 [Member] |  |
Available-for-sale securities: |  |
Cost | 110 | 110
Unrealized Gains | 0 | 0
Unrealized Losses | (7) | (4)
Fair Value | 103 | 106
Cost method, equity method, and other investments: |  |
Cost | 484 | 520
Level 3 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Cost method, equity method, and other investments: |  |
Cost | 0 | 0
Level 3 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 103 | 106
Cost method, equity method, and other investments: |  |
Cost | 484 | 520
Corporate debt securities [Member] |  |
AFS Continuous Unrealized Loss Position |  |
Less than 12 months, Fair Value | 2,932 | 944
Less than 12 months, Unrealized Losses | (50) | (9)
More than 12 months, Fair Value | 183 | 34
More than 12 months, Unrealized Losses | (6) | (1)
Corporate debt securities [Member] | Level 2 [Member] |  |
Available-for-sale securities: |  |
Cost | 6,618 | 6,282
Unrealized Gains | 50 | 105
Unrealized Losses | (56) | (10)
Fair Value | 6,612 | 6,377
Corporate debt securities [Member] | Level 2 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 6,612 | 6,377
Corporate debt securities [Member] | Level 2 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Corporate debt securities [Member] | Level 3 [Member] |  |
Available-for-sale securities: |  |
Cost | 1 | 1
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 1 | 1
Corporate debt securities [Member] | Level 3 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Corporate debt securities [Member] | Level 3 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 1 | 1
U.S. government and agency securities [Member] |  |
AFS Continuous Unrealized Loss Position |  |
Less than 12 months, Fair Value | 1,146 | 356
Less than 12 months, Unrealized Losses | (5) | (1)
More than 12 months, Fair Value | 142 | 267
More than 12 months, Unrealized Losses | (2) | (3)
U.S. government and agency securities [Member] | Level 1 [Member] |  |
Available-for-sale securities: |  |
Cost | 1,696 | 1,525
Unrealized Gains | 7 | 17
Unrealized Losses | (4) | (1)
Fair Value | 1,699 | 1,541
U.S. government and agency securities [Member] | Level 1 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 1,699 | 1,541
U.S. government and agency securities [Member] | Level 1 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
U.S. government and agency securities [Member] | Level 2 [Member] |  |
Available-for-sale securities: |  |
Cost | 1,537 | 1,597
Unrealized Gains | 3 | 4
Unrealized Losses | (3) | (3)
Fair Value | 1,537 | 1,598
U.S. government and agency securities [Member] | Level 2 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 1,537 | 1,598
U.S. government and agency securities [Member] | Level 2 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Marketable equity securities [Member] |  |
AFS Continuous Unrealized Loss Position |  |
Less than 12 months, Fair Value | 26 | 4
Less than 12 months, Unrealized Losses | (3) | (19)
More than 12 months, Fair Value | 0 | 0
More than 12 months, Unrealized Losses | 0 | 0
Marketable equity securities [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 99 | 80
Marketable equity securities [Member] | Level 1 [Member] |  |
Available-for-sale securities: |  |
Cost | 79 | 64
Unrealized Gains | 23 | 35
Unrealized Losses | (3) | (19)
Fair Value | 99 | 80
Marketable equity securities [Member] | Level 1 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Marketable equity securities [Member] | Level 1 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 99 | 80
Mortgage-backed securities [Member] |  |
AFS Continuous Unrealized Loss Position |  |
Less than 12 months, Fair Value | 622 | 346
Less than 12 months, Unrealized Losses | (10) | (3)
More than 12 months, Fair Value | 225 | 206
More than 12 months, Unrealized Losses | (4) | (3)
Mortgage-backed securities [Member] | Level 2 [Member] |  |
Available-for-sale securities: |  |
Cost | 1,466 | 1,462
Unrealized Gains | 14 | 22
Unrealized Losses | (14) | (6)
Fair Value | 1,466 | 1,478
Mortgage-backed securities [Member] | Level 2 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 1,466 | 1,478
Mortgage-backed securities [Member] | Level 2 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Foreign government and agency securities [Member] | Level 2 [Member] |  |
Available-for-sale securities: |  |
Cost | 65 | 85
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 65 | 85
Foreign government and agency securities [Member] | Level 2 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 65 | 85
Foreign government and agency securities [Member] | Level 2 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Certificates of deposit [Member] | Level 2 [Member] |  |
Available-for-sale securities: |  |
Cost | 47 | 44
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 47 | 44
Certificates of deposit [Member] | Level 2 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 47 | 44
Certificates of deposit [Member] | Level 2 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Other asset-backed securities [Member] | Level 2 [Member] |  |
Available-for-sale securities: |  |
Cost | 510 | 504
Unrealized Gains | 2 | 3
Unrealized Losses | 0 | 0
Fair Value | 512 | 507
Other asset-backed securities [Member] | Level 2 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 512 | 507
Other asset-backed securities [Member] | Level 2 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Debt funds [Member] |  |
AFS Continuous Unrealized Loss Position |  |
Less than 12 months, Fair Value | 1,190 | 1,291
Less than 12 months, Unrealized Losses | (93) | (109)
More than 12 months, Fair Value | 1,128 | 559
More than 12 months, Unrealized Losses | (229) | (41)
Debt funds [Member] | Level 2 [Member] |  |
Available-for-sale securities: |  |
Cost | 3,148 | 3,061
Unrealized Gains | 6 | 19
Unrealized Losses | (322) | (150)
Fair Value | 2,832 | 2,930
Debt funds [Member] | Level 2 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 2,832 | 2,930
Debt funds [Member] | Level 2 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Auction rate securities [Member] |  |
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 | 102 | 105
More than 12 months, Unrealized Losses | (7) | (4)
Auction rate securities [Member] | Level 3 [Member] |  |
Available-for-sale securities: |  |
Cost | 109 | 109
Unrealized Gains | 0 | 0
Unrealized Losses | (7) | (4)
Fair Value | 102 | 105
Auction rate securities [Member] | Level 3 [Member] | Investments [Member] |  |
Available-for-sale securities: |  |
Fair Value | 0 | 0
Auction rate securities [Member] | Level 3 [Member] | Other Assets [Member] |  |
Available-for-sale securities: |  |
Fair Value | 102 | 105
Exchange-traded funds [Member] | Level 1 [Member] |  |
Trading securities: |  |
Cost | 65 | 58
Unrealized Gains | 16 | 19
Unrealized Losses | 0 | 0
Fair Value | 81 | 77
Exchange-traded funds [Member] | Level 1 [Member] | Investments [Member] |  |
Trading securities: |  |
Fair Value | 81 | 77
Exchange-traded funds [Member] | Level 1 [Member] | Other Assets [Member] |  |
Trading securities: |  |
Fair Value | $ 0 | $ 0

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