Financial Instruments - Investments by Category and Related Balance Sheet Classification (Details) - USD ($) $ in Millions	Jan. 28, 2022	Apr. 30, 2021
Schedule of Investments [Line Items]
Cost	$ 7,796	$ 7,144
Unrealized Gains	59	155
Unrealized Losses	(79)	(42)
Fair Value	7,776	7,257
Investments
Schedule of Investments [Line Items]
Fair Value	7,742	7,224
Other Assets
Schedule of Investments [Line Items]
Fair Value	33	33
Level 2
Schedule of Investments [Line Items]
Cost	7,244	6,603
Unrealized Gains	48	129
Unrealized Losses	(74)	(36)
Fair Value	7,218	6,696
Level 2 | Investments
Schedule of Investments [Line Items]
Fair Value	7,218	6,696
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	515	505
Unrealized Gains	11	26
Unrealized Losses	(2)	(3)
Fair Value	525	528
U.S. government and agency securities | Level 1 | Investments
Schedule of Investments [Line Items]
Fair Value	525	528
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	1,010	810
Unrealized Gains	0	0
Unrealized Losses	(17)	(7)
Fair Value	993	804
U.S. government and agency securities | Level 2 | Investments
Schedule of Investments [Line Items]
Fair Value	993	804
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	4,964	4,557
Unrealized Gains	39	103
Unrealized Losses	(40)	(13)
Fair Value	4,963	4,647
Corporate debt securities | Level 2 | Investments
Schedule of Investments [Line Items]
Fair Value	4,963	4,647
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	645
Unrealized Gains	7	21
Unrealized Losses	(15)	(16)
Fair Value	612	650
Mortgage-backed securities | Level 2 | Investments
Schedule of Investments [Line Items]
Fair Value	612	650
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	17	31
Unrealized Gains	0	1
Unrealized Losses	0	0
Fair Value	18	33
Non-U.S. government and agency securities | Level 2 | Investments
Schedule of Investments [Line Items]
Fair Value	18	33
Non-U.S. government and agency securities | Level 2 | Other Assets
Schedule of Investments [Line Items]
Fair Value	0	0
Certificates of deposit | Level 2
Schedule of Investments [Line Items]
Cost	45	19
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	45	19
Certificates of deposit | Level 2 | Investments
Schedule of Investments [Line Items]
Fair Value	45	19
Certificates of deposit | 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	588	534
Unrealized Gains	1	4
Unrealized Losses	(2)	(1)
Fair Value	587	537
Other asset-backed securities | Level 2 | Investments
Schedule of Investments [Line Items]
Fair Value	587	537
Other asset-backed securities | Level 2 | Other Assets
Schedule of Investments [Line Items]
Fair Value	0	0
Debt funds | Level 2
Schedule of Investments [Line Items]
Cost		7
Unrealized Gains		0
Unrealized Losses		0
Fair Value		7
Debt funds | Level 2 | Investments
Schedule of Investments [Line Items]
Fair Value		7
Debt funds | Level 2 | Other Assets
Schedule of Investments [Line Items]
Fair Value		0
Auction rate securities | Level 3
Schedule of Investments [Line Items]
Cost	36	36
Unrealized Gains	0	0
Unrealized Losses	(3)	(3)
Fair Value	33	33
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	$ 33	$ 33