Fair Value of Financial Assets and Liabilities and Non-marketable Equity Securities - Carrying Value of Non-marketable Equity Securities (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Jan. 26, 2025 |
Jan. 28, 2024 |
|
| Investments, Debt and Equity Securities [Abstract] | ||
| Carrying amount, beginning | $ 1,321 | $ 288 |
| Net additions | 1,309 | 859 |
| Unrealized gains | 816 | 194 |
| Impairments and unrealized losses | (59) | (20) |
| Carrying amount, ending | $ 3,387 | $ 1,321 |