Assets and Liabilities Held for Sale and Discontinued Operations (Financial Results of Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 15, 2013	Jun. 16, 2012	Jun. 15, 2013	Jun. 16, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of tax	$ (49.3)	$ 75.3	$ 14.6	$ 118.0
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of tax	(49.3)	75.3	14.6	118.0
Discontinued Operations [Member] | Canada Safeway Limited [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales and other revenue	1,522.3	1,558.2	3,015.5	3,063.1
Income from discontinued operations before income taxes	84.7	108.1	158.1	185.5
Income tax (expense) benefit	(134.0)	(34.0)	(143.5)	(60.0)
(Loss) income from discontinued operations, net of tax	(49.3)	74.1	14.6	125.5
Discontinued Operations [Member] | Genuardi Stores [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Lease exit costs, net of gains on property dispositions			0	(4.9)
Property impairment charges			0	(7.3)
Income tax (expense) benefit			0	4.7
(Loss) income from discontinued operations, net of tax			0	(7.5)
Gain on property dispositions and lease exit costs	0	2.0
Income tax expense	0	(0.8)
Gain from discontinued operations of Genuardi's	$ 0	$ 1.2