Derivative Financial Instruments - Notional Values (Details) - USD ($) $ in Millions |
Apr. 28, 2019 |
Jan. 27, 2019 |
|---|---|---|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||
| Designated as cash flow hedges | $ 411 | $ 408 |
| Not designated for hedge accounting | $ 253 | $ 241 |