Consolidated Statements of Changes in Stockholders' Equity/Partners' Capital - USD ($) $ in Millions		Total	Interest rate swap 1	Interest rate swap 2	Partners’ Capital	Common Stock Class A common stock	Common Stock Class B common stock	Additional Paid In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Interest rate swap 1	Accumulated Other Comprehensive Income (Loss) Interest rate swap 2	Retained Earnings	Non-Controlling Interests	Non-Controlling Interests Interest rate swap 1	Non-Controlling Interests Interest rate swap 2
Beginning balance at Feb. 02, 2020		$ 771			$ 771
Partners' Capital
Equity investment from partners		1			1
Equity-based compensation		4			4
Net income		37			37
Net interest rate swap gain (loss), net of tax		3			3
Distributions to partners		(15)			(15)
Ending balance at Jan. 31, 2021		801			801
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		37
Net interest rate swap gain, net of tax (expense) of $(9) and $(5)		3
Equity-based compensation		15			15
Net income		74			74
Net interest rate swap gain (loss), net of tax		4			4
Distributions to partners		(23)			(23)
Ending balance at Jul. 22, 2021		871			871
Beginning balance at Jan. 31, 2021		801			801
Partners' Capital
Net income	[1]	166
Ending balance at Jan. 30, 2022					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		225
Net interest rate swap gain, net of tax (expense) of $(9) and $(5)		34
Ending balance (in shares) at Jan. 30, 2022						167,522,403	78,398,141
Ending balance at Jan. 30, 2022		1,831				$ 2	$ 1	$ 1,214	$ 16			$ 92	$ 506
Beginning balance at Jul. 22, 2021		871			871
Partners' Capital
Net income		92
Ending balance at Jan. 30, 2022					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of partners’ capital		0			(871)			871
Reorganization transactions (in shares)						119,950,882	85,853,383
Reorganization transactions		0				$ 1	$ 1	(2)
Reclassification of non-controlling interests upon reorganization		0						(300)	(2)				302
Issuance of Class A Shares, net of issuance costs (in shares)						40,116,279
Issuance of Class A Shares, net of issuance costs		756				$ 1		755
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP		200						200
Net income		151										92	59
Equity-based compensation		10						7					3
Net interest rate swap gain, net of tax (expense) of $(9) and $(5)			$ 4	$ 26						$ 2	$ 16			$ 2	$ 10
Distributions to non-controlling interest holders		(34)											(34)
Exchange of Partnership Interests for Class A Shares (in shares)						7,455,242	(7,455,242)
Exchange of Partnership Interests for Class A Shares		0						49					(49)
Establishment of Tax Receivable Agreement Liabilities		(153)						(153)
Non-controlling interests adjustment for purchase of Partnership Interests and vesting of Core & Main Holdings, LP Partnership Interests held by non-controlling interests		0						(213)					213
Ending balance (in shares) at Jan. 30, 2022						167,522,403	78,398,141
Ending balance at Jan. 30, 2022		1,831				$ 2	$ 1	1,214	16			92	506
Partners' Capital
Net income		366
Ending balance at Jan. 29, 2023					$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP		30						30
Net income		581										366	215
Equity-based compensation		11						8					3
Net interest rate swap gain, net of tax (expense) of $(9) and $(5)		44							27				17
Distributions to non-controlling interest holders		(54)						(6)					(48)
Exchange of Partnership Interests for Class A Shares (in shares)						5,132,134	(5,133,763)
Exchange of Partnership Interests for Class A Shares		0						40	2				(42)
Establishment of Tax Receivable Agreement Liabilities		(34)						(34)
Non-controlling interests adjustment for purchase of Partnership Interests and vesting of Core & Main Holdings, LP Partnership Interests held by non-controlling interests		0						(12)					12
Ending balance (in shares) at Jan. 29, 2023						172,765,161	73,229,675
Ending balance at Jan. 29, 2023		$ 2,410				$ 2	$ 1	$ 1,241	$ 45			$ 458	$ 663
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease)		1,000,000				110,644		1,000,000
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited		0				(20)	(34,703)

[1] For the fiscal year ended January 30, 2022, the net income attributable to Core & Main, Inc. includes net income prior to the Reorganization Transactions (as defined in Note 1) of $74 million and net income subsequent to the Reorganization Transactions of $92 million. Refer to the Statements of Changes in Stockholders’ Equity/Partners’ Capital for a summary of net income attributable to Core & Main, Inc. subsequent to the Reorganization Transactions. See Note 1 for a description of the Basis of Presentation of the consolidated financial statements.