Basic and Diluted Earnings Per Share - Calculation (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
		May 01, 2022	May 02, 2021
Basic earnings per share:
Net income		$ 137	$ 27
Net income attributable to non-controlling interests		51
Net income available to Class A common stock		$ 86
Weighted average shares outstanding - basic	[1]	167,536,662
Net income per share - basic (in dollars per share)	[1]	$ 0.51
Diluted earnings per share:
Net income available to common shareholders - basic		$ 86
Increase to net income attributable to dilutive instruments		38
Net income available to common shareholders - diluted		$ 124
Weighted average shares outstanding - basic	[1]	167,536,662
Incremental shares of common stock attributable to dilutive instruments		78,608,874
Weighted average shares outstanding - diluted	[1]	246,145,536
Net income per share - diluted (in dollars per share)	[1]	$ 0.50

[1] The Company analyzed the calculation of earnings per share for the periods prior to the Reorganization Transactions (as described in Note 1) and determined that it resulted in values that would not be meaningful to the users of the condensed consolidated financial statements. Therefore, there is no earnings per share attributable to Core & Main, Inc. for the three months ended May 2, 2021.