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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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The number of businesses acquired by the entity during the period.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Business Acquisitions Business Acquisition-Additional Details (Details) $ in Millions				3 Months Ended	9 Months Ended
	Dec. 08, 2017 USD ($)	Jul. 29, 2017 USD ($)	Jun. 23, 2017 USD ($)	Dec. 02, 2017 USD ($)	Dec. 02, 2017 USD ($) business
Business Acquisition [Line Items]
Integration related costs					$ 2
AG Florida
Business Acquisition [Line Items]
Revenues		$ 650
Unified Grocers, Inc.
Business Acquisition [Line Items]
Weighted average useful life of acquired intangible assets (in years)			15 years
Limited Liability Company
Business Acquisition [Line Items]
Total purchase price					$ 5
Business acquisition, percentage of voting interests acquired (as a percentage)				100.00%	100.00%
Number of businesses acquired \| business					5
Unified Grocers, Inc.
Business Acquisition [Line Items]
Payments to acquire businesses			$ 390
Business acquisition, percentage of voting interests acquired (as a percentage)			100.00%
Integration related costs					$ 30
Unified Grocers, Inc. \| Debt
Business Acquisition [Line Items]
Payments to acquire businesses			$ 276
Unified Grocers, Inc. \| Common Stock
Business Acquisition [Line Items]
Payments to acquire businesses			$ 114
Subsequent Event \| AG Florida
Business Acquisition [Line Items]
Total purchase price	$ 193
Payments to acquire businesses	$ 131
Business acquisition, percentage of voting interests acquired (as a percentage)	100.00%
Assumption of debt	$ 62
Joliet, Illinois \| Distribution Center
Business Acquisition [Line Items]
Payments to Acquire Productive Assets				$ 61
Harrisburg, PA \| Distribution Center
Business Acquisition [Line Items]
Payments to Acquire Productive Assets					$ 37