Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 08, 2018	Sep. 09, 2017	Sep. 08, 2018	Sep. 09, 2017
Income Statement [Abstract]
Net sales	$ 3,512	$ 3,449	$ 8,267	$ 6,966
Cost of sales	3,218	3,109	7,545	6,195
Gross profit	294	340	722	771
Selling and administrative expenses	356	323	784	710
Operating (loss) earnings	(62)	17	(62)	61
Interest expense, net	27	30	76	73
Net periodic benefit income, excluding service cost	(9)	(12)	(21)	(29)
Equity in earnings of unconsolidated affiliates	0	0	0	(2)
(Loss) earnings from continuing operations before income taxes	(80)	(1)	(117)	19
Income tax (benefit) provision	(25)	0	(35)	11
Net (loss) earnings from continuing operations	(55)	(1)	(82)	8
(Loss) income from discontinued operations, net of tax	(3)	(24)	3	(21)
Net loss including noncontrolling interests	(58)	(25)	(79)	(13)
Less net loss (earnings) attributable to noncontrolling interests	1	0	1	(1)
Net loss attributable to SUPERVALU INC.	$ (57)	$ (25)	$ (78)	$ (14)
Basic net loss per share attributable to SUPERVALU INC.:
Continuing operations (in dollars per share)	$ (1.41)	$ (0.02)	$ (2.11)	$ 0.20
Discontinued operations (in dollars per share)	(0.08)	(0.64)	0.07	(0.55)
Basic net earnings per share (in dollars per share)	(1.49)	(0.65)	(2.04)	(0.36)
Diluted net loss per share attributable to SUPERVALU INC.:
Continuing operations (in dollars per share)	(1.41)	(0.02)	(2.11)	0.20
Discontinued operations (in dollars per share)	(0.08)	(0.64)	0.07	(0.55)
Diluted net earnings per share (in dollars per share)	$ (1.49)	$ (0.65)	$ (2.04)	$ (0.36)
Weighted average number of shares outstanding:
Basic (in shares)	39	38	39	38
Diluted (in shares)	39	38	39	38