QUARTERLY DATA (UNAUDITED) - NARRATIVE (Details) $ in Millions			3 Months Ended						4 Months Ended		12 Months Ended
	Apr. 26, 2019 USD ($)	Mar. 13, 2019 USD ($)	Feb. 01, 2020 USD ($) store	Nov. 09, 2019 USD ($)	Aug. 17, 2019 USD ($)	Feb. 02, 2019 USD ($)	Nov. 10, 2018 USD ($)	Aug. 18, 2018 USD ($)	May 25, 2019 USD ($)	May 26, 2018 USD ($)	Feb. 01, 2020 USD ($) store	Feb. 02, 2019 USD ($)	Feb. 03, 2018 USD ($)
Quarterly Data
Revaluation of contingent consideration			$ (51)	$ 4	$ 2	$ 33			$ (24)		$ (69)	$ 33
Revaluation of contingent consideration, net of tax			(36)	3	2	26			(18)
Severance expenses, before tax				80							80
Severance expenses, net of tax				61							$ 61
Transformation cost before tax			52
Transformation cost net of tax			$ 37
Number of planned store closures | store			35								35
Reduction to depreciation and amortization expenses net of tax, related to held for sale assets										$ 14
Reduction to depreciation and amortization expenses net of tax, related to held for sale assets, net of tax										11
Gain on sale of businesses								$ 11	176	1,771	$ 176	1,782
Gain on sale of business, net of tax										1,352
Mark to market gain on Ocado securities			$ (9)	106	(45)	75	$ (100)	216	106	36	157	228
Mark to market gain (loss) on Ocado securities, net of tax			(6)	81	(36)	59	$ (77)	164	80	27
Asset Impairment Charges			0			0
Impairment of financial instrument						42
Impairment of financial instrument, net of tax						33
Turkey Hill Dairy Business | Disposed by Sale
Quarterly Data
Gain on sale of businesses	$ 106								106
Gain on sale of business, net of tax	$ 80								80
You Technology business unit | Disposed by Sale
Quarterly Data
Gain on sale of businesses		$ 70							70
Gain on sale of business, net of tax		$ 52							52
Convenience Store Business | Disposed by Sale
Quarterly Data
Gain on sale of businesses								11
Gain on sale of business, net of tax								$ 8
Lucky's Market | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations
Quarterly Data
Asset Impairment Charges				238
Impairment charges attributable to The Kroger Co.				131							305
Impairment charges attributable to The Kroger Co., net of tax				100							225
Non-cash charges, before tax			174
Non-cash charges, net of tax			125
Multi-employer pension funds
Quarterly Data
Charge (before-tax) related to pension plan agreements			4	45	27	168			59	13	135	155	$ 550
Charge (after-tax) related to pension plan agreements			$ 3	$ 35	$ 22	$ 131			$ 44	$ 10	$ 104	$ 121	$ 360