Fair Value Measurements - Summary (Details) - Recurring - Estimate of Fair Value - USD ($) $ in Millions	Jan. 31, 2020	Feb. 01, 2019
Short-term Investments
Available-for-sale Securities
Available-for-sale debt securities	$ 160	$ 218
Short-term Investments | Money market funds | Level 1
Available-for-sale Securities
Available-for-sale debt securities	105	207
Short-term Investments | Corporate debt securities | Level 2
Available-for-sale Securities
Available-for-sale debt securities	23	1
Short-term Investments | Agency securities | Level 2
Available-for-sale Securities
Available-for-sale debt securities	19	10
Short-term Investments | U.S. Treasury securities | Level 1
Available-for-sale Securities
Available-for-sale debt securities	13	0
Long-term Investments
Available-for-sale Securities
Available-for-sale debt securities	372	256
Long-term Investments | Corporate debt securities | Level 2
Available-for-sale Securities
Available-for-sale debt securities	62	191
Long-term Investments | Agency securities | Level 2
Available-for-sale Securities
Available-for-sale debt securities	30	65
Long-term Investments | U.S. Treasury securities | Level 1
Available-for-sale Securities
Available-for-sale debt securities	$ 280	$ 0