Stock-Based Compensation - Summary of Equity Award Transactions 1 (Details) shares in Millions	9 Months Ended
	Oct. 28, 2018 $ / shares shares
Number of Shares
RSUs, PSUs, and Market-based PSUs Outstanding, beginning balance (in shares) | shares	22
Granted (in shares) | shares	4	[1],[2]
Vested restricted stock (in shares) | shares	(10)
Canceled and forfeited (in shares) | shares	0
RSUs, PSUs, and Market-based PSUs Outstanding, ending balance (in shares) | shares	16
Weighted Average Grant-Date Fair Value Per Share
RSUs, PSUs, and Market-based PSUs, beginning balance (in dollars per share) | $ / shares	$ 66.72
Granted (in dollars per share) | $ / shares	262.44
Vested restricted stock (in dollars per share) | $ / shares	47.61
Canceled and forfeited (in dollars per share) | $ / shares	0.00
RSUs, PSUs, and Market-based PSUs, ending balance (in dollars per share) | $ / shares	$ 127.89

[1] Includes the number of PSUs granted that will be issued and eligible to vest if the maximum corporate financial performance goal for fiscal year 2019 is achieved. Depending on the actual level of the corporate performance achievement at the end of fiscal year 2019, the PSUs issued could be up to 0.3 million shares.

[2] Includes the number of market-based PSUs granted that will be issued and eligible to vest if the maximum goal for total shareholder return, or TSR, over the 3-year measurement period is achieved. Depending on the ranking of our TSR compared to those of the companies comprising the Standard & Poor’s 500 Index during that period, the market-based PSUs issued could be up to 45 thousand shares.