Derivative Financial Instruments (Details) - USD ($) $ in Millions |
Jan. 26, 2020 |
Jan. 27, 2019 |
|---|---|---|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||
| Designated as cash flow hedges | $ 428 | $ 408 |
| Not designated for hedge accounting | $ 287 | $ 241 |