Stockholders' Equity (Summary of Restricted Stock Activity) (Details) - Class A Common Stock $ / shares in Units, $ in Millions	6 Months Ended
	Jul. 31, 2020 USD ($) $ / shares shares
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit conversion into common stock (in shares)	1
Fair value of restricted stock-based awards, vested | $	$ 751
Aggregate intrinsic value, nonvested | $	$ 2,800
Number of Units
Outstanding (in shares)	20,200,000
Restricted Stock | VMware RSUs
Number of Units
Outstanding (in shares)	17,474,000
Granted (in shares)	9,516,000
Vested (in shares)	(5,497,000)
Forfeited (in shares)	(1,285,000)
Outstanding (in shares)	20,208,000
Weighted-Average Grant Date Fair Value
Outstanding, weighted-average grant date fair value (in USD per share) | $ / shares	$ 128.38
Granted, weighted-average grant date fair value (in USD per share) | $ / shares	150.95
Vested, weighted-average grant date fair value (in USD per share) | $ / shares	110.07
Forfeited, weighted-average grant date fair value (in USD per share) | $ / shares	129.95
Outstanding, weighted-average grant date fair value (in USD per share) | $ / shares	$ 143.81
Performance Stock Units (PSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio or awards upon acquisition	0.1
Performance Stock Units (PSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio or awards upon acquisition	2.0