Cash, Cash Equivalents and Investments - Summary of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Millions	Jan. 31, 2021	Oct. 25, 2020	Jan. 26, 2020
Summary of Cash, Cash Equivalents and Investments
Cash	$ 1,150	$ 1,136
Total Cash equivalents	5,063	4,215
Total Cash and Cash equivalents	6,213	5,351	$ 3,424
Equity investments cost	144	132
Equity investments unrealized gain	68	61
Equity investments unrealized loss	10	9
Equity investments estimated fair value	202	184
Total short-term and long-term investments cost	1,930	1,847
Gross unrealized gains on short-term and long-term investments	91	88
Gross unrealized losses on short-term and long-term investments	10	10
Estimated fair value of short-term and long-term investments	2,011	1,925
Cash, cash equivalents and investments, cost	8,143	7,198
Cash, cash equivalents and investments, gross unrealized gains	91	88
Cash, cash equivalents and investments, gross unrealized losses	10	10
Cash, cash equivalents and investments, estimated fair value	8,224	7,276
Total fixed income securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	1,786	1,715
Gross unrealized gains on fixed income securities	23	27
Gross unrealized losses on fixed income securities	0	1
Estimated fair value of fixed income securities	1,809	1,741
Bank certificate of deposit
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	2
Gross unrealized gains on fixed income securities	0
Gross unrealized losses on fixed income securities	0
Estimated fair value of fixed income securities	2
U.S. Treasury and agency securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	332	394
Gross unrealized gains on fixed income securities	2	4
Gross unrealized losses on fixed income securities	0	0
Estimated fair value of fixed income securities	334	398
Non-U.S. government securities | CANADA
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	6
Gross unrealized gains on fixed income securities	0
Gross unrealized losses on fixed income securities	0
Estimated fair value of fixed income securities	6
Municipal securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	354	359
Gross unrealized gains on fixed income securities	6	6
Gross unrealized losses on fixed income securities	0	0
Estimated fair value of fixed income securities	360	365
Commercial paper, corporate bonds and medium-term notes
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	552	492
Gross unrealized gains on fixed income securities	7	8
Gross unrealized losses on fixed income securities	0	1
Estimated fair value of fixed income securities	559	499
Asset-backed and mortgage-backed securities
Summary of Cash, Cash Equivalents and Investments
Cost of fixed income securities	540	470
Gross unrealized gains on fixed income securities	8	9
Gross unrealized losses on fixed income securities	0	0
Estimated fair value of fixed income securities	548	479
Publicly traded equity securities
Summary of Cash, Cash Equivalents and Investments
Equity investments cost	12	11
Equity investments unrealized gain	42	36
Equity investments unrealized loss	1	2
Equity investments estimated fair value	53	45
Equity investments in privately-held companies
Summary of Cash, Cash Equivalents and Investments
Equity investments cost	132	121
Equity investments unrealized gain	26	25
Equity investments unrealized loss	9	7
Equity investments estimated fair value	149	139
Money market funds
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents	5,038	4,209
Municipal securities
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents	15	$ 6
Commercial paper, corporate bonds and medium-term notes
Summary of Cash, Cash Equivalents and Investments
Total Cash equivalents	$ 10