Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	4 Months Ended
	Jun. 16, 2018	Jun. 17, 2017
Income Statement [Abstract]
Net sales	$ 4,755	$ 3,517
Cost of sales	4,327	3,086
Gross profit	428	431
Selling and administrative expenses	428	387
Operating earnings	0	44
Interest expense, net	49	43
Net periodic benefit income, excluding service cost	(12)	(17)
Equity in earnings of unconsolidated affiliates	0	(2)
(Loss) earnings from continuing operations before income taxes	(37)	20
Income tax (benefit) provision	(10)	11
Net (loss) earnings from continuing operations	(27)	9
Income from discontinued operations, net of tax	6	3
Net (loss) earnings including noncontrolling interests	(21)	12
Less net earnings attributable to noncontrolling interests	0	(1)
Net (loss) earnings attributable to SUPERVALU INC.	$ (21)	$ 11
Basic net (loss) earnings per share attributable to SUPERVALU INC.:(1)
Continuing operations (in dollars per share)	$ (0.70)	$ 0.21
Discontinued operations (in dollars per share)	0.15	0.08
Basic net earnings per share (in dollars per share)	(0.55)	0.30
Diluted net (loss) earnings per share attributable to SUPERVALU INC.:(1)
Continuing operations (in dollars per share)	(0.70)	0.21
Discontinued operations (in dollars per share)	0.15	0.08
Diluted net earnings per share (in dollars per share)	$ (0.55)	$ 0.30
Weighted average number of shares outstanding:
Basic (in shares)	38	38
Diluted (in shares)	38	38