Net (Loss) Earnings Per Share - Calculation of Basic and Diluted Net Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	4 Months Ended
	Jun. 16, 2018	Jun. 17, 2017
Earnings Per Share [Abstract]
Net (loss) earnings from continuing operations	$ (27)	$ 9
Less net earnings attributable to noncontrolling interests	0	(1)
Net (loss) earnings from continuing operations attributable to SUPERVALU INC.	(27)	8
Income from discontinued operations, net of tax	6	3
Net (loss) earnings attributable to SUPERVALU INC.	$ (21)	$ 11
Weighted average number of shares outstanding-basic	38	38
Dilutive impact of stock-based awards	0	0
Weighted average number of shares outstanding-diluted	38	38
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