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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