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Financial Instruments - Investments by Category and Related Balance Sheet Classification (Details) - USD ($)
$ in Millions
Jul. 27, 2018
Apr. 27, 2018
Schedule of Investments [Line Items]    
Cost $ 6,813 $ 6,963
Unrealized Gains 17 22
Unrealized Losses (162) (165)
Fair Value 6,668 6,820
Investments    
Schedule of Investments [Line Items]    
Fair Value 6,624 6,776
Other Assets    
Schedule of Investments [Line Items]    
Fair Value 44 44
Level 2    
Schedule of Investments [Line Items]    
Cost 6,131 6,184
Unrealized Gains 17 22
Unrealized Losses (134) (136)
Fair Value 6,014 6,070
Level 2 | Investments    
Schedule of Investments [Line Items]    
Fair Value 6,014 6,070
Level 2 | Other Assets    
Schedule of Investments [Line Items]    
Fair Value 0 0
U.S. government and agency securities | Level 1    
Schedule of Investments [Line Items]    
Cost 635 732
Unrealized Gains 0 0
Unrealized Losses (25) (26)
Fair Value 610 706
U.S. government and agency securities | Level 1 | Investments    
Schedule of Investments [Line Items]    
Fair Value 610 706
U.S. government and agency securities | Level 1 | Other Assets    
Schedule of Investments [Line Items]    
Fair Value 0 0
U.S. government and agency securities | Level 2    
Schedule of Investments [Line Items]    
Cost 838 848
Unrealized Gains 0 0
Unrealized Losses (23) (24)
Fair Value 815 824
U.S. government and agency securities | Level 2 | Investments    
Schedule of Investments [Line Items]    
Fair Value 815 824
U.S. government and agency securities | Level 2 | Other Assets    
Schedule of Investments [Line Items]    
Fair Value 0 0
Corporate debt securities | Level 2    
Schedule of Investments [Line Items]    
Cost 4,162 4,179
Unrealized Gains 16 20
Unrealized Losses (71) (75)
Fair Value 4,107 4,124
Corporate debt securities | Level 2 | Investments    
Schedule of Investments [Line Items]    
Fair Value 4,107 4,124
Corporate debt securities | Level 2 | Other Assets    
Schedule of Investments [Line Items]    
Fair Value 0 0
Mortgage-backed securities | Level 2    
Schedule of Investments [Line Items]    
Cost 620 725
Unrealized Gains 1 2
Unrealized Losses (36) (34)
Fair Value 585 693
Mortgage-backed securities | Level 2 | Investments    
Schedule of Investments [Line Items]    
Fair Value 585 693
Mortgage-backed securities | Level 2 | Other Assets    
Schedule of Investments [Line Items]    
Fair Value 0 0
Non-U.S. government and agency securities | Level 2    
Schedule of Investments [Line Items]    
Cost 87 74
Unrealized Gains 0 0
Unrealized Losses (1) (1)
Fair Value 86 73
Non-U.S. government and agency securities | Level 2 | Investments    
Schedule of Investments [Line Items]    
Fair Value 86 73
Non-U.S. government and agency securities | Level 2 | Other Assets    
Schedule of Investments [Line Items]    
Fair Value 0 0
Other asset-backed securities | Level 2    
Schedule of Investments [Line Items]    
Cost 424 358
Unrealized Gains 0 0
Unrealized Losses (3) (2)
Fair Value 421 356
Other asset-backed securities | Level 2 | Investments    
Schedule of Investments [Line Items]    
Fair Value 421 356
Other asset-backed securities | Level 2 | Other Assets    
Schedule of Investments [Line Items]    
Fair Value 0 0
Auction rate securities | Level 3    
Schedule of Investments [Line Items]    
Cost 47 47
Unrealized Gains 0 0
Unrealized Losses (3) (3)
Fair Value 44 44
Auction rate securities | Level 3 | Investments    
Schedule of Investments [Line Items]    
Fair Value 0 0
Auction rate securities | Level 3 | Other Assets    
Schedule of Investments [Line Items]    
Fair Value $ 44 $ 44