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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