Condensed Consolidated Statements of Changes in Partners' Capital/Stockholders' Equity - USD ($) $ in Millions	Total	Net old interest rate swap gain, net of tax	Net new interest rate swap loss, net of tax	Partners’ Capital	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid In Capital	Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Net old interest rate swap gain, net of tax	Accumulated Other Comprehensive Income Net new interest rate swap loss, net of tax	Retained Earnings	Non-Controlling Interests	Non-Controlling Interests Net old interest rate swap gain, net of tax	Non-Controlling Interests Net new interest rate swap loss, net of tax
Beginning balance at Jan. 31, 2021	$ 801			$ 801
Partners' Capital
Equity-based compensation	1			1
Net income	27			27
Net interest rate swap gain, net of tax	2			2
Distributions to partners	(10)			(10)
Ending balance at May. 02, 2021	821			821
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27			27
Beginning balance at Jan. 31, 2021	801			801
Partners' Capital
Net income	37
Ending balance at Aug. 01, 2021				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	37
Net interest rate swap gain, net of tax	6
Ending balance at Aug. 01, 2021	1,548				$ 2	$ 1	$ 1,090	$ (1)			$ (20)	$ 476
Ending balance (in shares) at Aug. 01, 2021					154,834,603	85,853,383
Beginning balance at May. 02, 2021	821			821
Partners' Capital
Equity-based compensation	14			14
Net income	47			47
Net interest rate swap gain, net of tax	2			2
Distributions to partners	(13)			(13)
Ending balance at Jul. 22, 2021	871			871
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	47			47
Beginning balance at May. 02, 2021	821			821
Partners' Capital
Net income	10
Ending balance at Aug. 01, 2021				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10
Net interest rate swap gain, net of tax	4
Ending balance at Aug. 01, 2021	1,548				$ 2	$ 1	1,090	(1)			(20)	476
Ending balance (in shares) at Aug. 01, 2021					154,834,603	85,853,383
Beginning balance at Jul. 22, 2021	871			871
Partners' Capital
Net income	(37)										(20)	(17)
Ending balance at Aug. 01, 2021				0
Partners' Capital
Reclassification of partners’ capital	0			$ (871)			871
Reorganization transactions	0				$ 1	$ 1	(2)
Reorganization transactions (in shares)					119,950,882	85,853,383
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(37)										(20)	(17)
Equity-based compensation	5						3					2
Net interest rate swap gain, net of tax		$ 4	$ (2)						$ 2	$ (1)			$ 2	$ (1)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	140						140
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	(89)						(89)
Noncontrolling Interest, Adjustment For Vesting Of Partnership Interests	0						(8)					8
Ending balance at Aug. 01, 2021	1,548				$ 2	$ 1	1,090	(1)			(20)	476
Ending balance (in shares) at Aug. 01, 2021					154,834,603	85,853,383
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of non-controlling interests upon reorganization	0						(300)	(2)				302
Issuance of Class A Shares, net of issuance costs	656				$ 1		655
Issuance of Class A Shares, net of issuance costs					34,883,721
Non-controlling interests adjustment for purchase of Partnership Interests from Core & Main Holdings, LP	0						(180)					180
Net income	137										86	51
Beginning balance at Jan. 30, 2022	1,831				$ 2	$ 1	1,214	16			92	506
Beginning balance (in shares) at Jan. 30, 2022					167,522,403	78,398,141
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	137										86	51
Equity-based compensation	3										2	1
Net interest rate swap gain, net of tax	37							23				14
Distributions to non-controlling interest holders	(3)											(3)
Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares)					55,595	(55,713)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP							(1)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	1
Vesting of restricted stock units, net of tax withholdings (in shares)					1,321
Forfeiture of Class A Shares and Partnership Interests (in shares)					(20)	(34,703)
Noncontrolling Interest, Adjustment For Vesting Of Partnership Interests	0						(1)					1
Ending balance at May. 01, 2022	2,006				$ 2	$ 1	1,214	39			180	570
Ending balance (in shares) at May. 01, 2022					167,579,299	78,307,725
Partners' Capital
Net income	319
Beginning balance at Jan. 30, 2022	1,831				$ 2	$ 1	1,214	16			92	506
Beginning balance (in shares) at Jan. 30, 2022					167,522,403	78,398,141
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	319
Net interest rate swap gain, net of tax	28
Ending balance at Jul. 31, 2022	2,165				$ 2	$ 1	1,216	33			298	615
Ending balance (in shares) at Jul. 31, 2022					167,963,575	77,930,404
Partners' Capital
Net income	182										115	67
Beginning balance at May. 01, 2022	2,006				$ 2	$ 1	1,214	39			180	570
Beginning balance (in shares) at May. 01, 2022					167,579,299	78,307,725
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	182										115	67
Equity-based compensation	4										3	1
Net interest rate swap gain, net of tax	(9)							(6)				(3)
Distributions to non-controlling interest holders	(17)											(17)
Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares)					377,321	(377,321)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	(1)						(1)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	(2)						(2)
Vesting of restricted stock units, net of tax withholdings (in shares)					6,955
Ending balance at Jul. 31, 2022	2,165				$ 2	$ 1	1,216	$ 33			$ 298	615
Ending balance (in shares) at Jul. 31, 2022					167,963,575	77,930,404
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period Value Exchange Of Partnership Interestshares	$ 0						$ 3					$ (3)