Business Acquisitions Schedule of Intangible Assets Acquired (Details) - Associated Grocers Of Florida, Inc. [Member] - USD ($) $ in Millions	6 Months Ended
Sep. 08, 2018	Dec. 08, 2017
Business Acquisition [Line Items]
Intangible assets	$ 48	$ 52
Customer Relationships [Member]
Business Acquisition [Line Items]
Weighted average useful life of acquired intangible assets (in years)	15 years
Intangible assets	$ 43
Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible assets	$ 5
Minimum \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Weighted average useful life of acquired intangible assets (in years)	2 years
Maximum \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Weighted average useful life of acquired intangible assets (in years)	5 years

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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