Retirement Plans Contributions to Multiemployer Pension Plans (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Multiemployer Plans [Line Items]
USF Contributions	$ 38	$ 35	$ 34
Multiemployer plans, withdrawal liability	120
Minneapolis Food Distributing Industry Pension Plan
Multiemployer Plans [Line Items]
USF Contributions	5	5	5
Teamster Pension Trust Fund of Philadelphia and Vicinity
Multiemployer Plans [Line Items]
USF Contributions	4	4	4
Local 703 I.B. of T. Grocery and Food Employees’ Pension Plan
Multiemployer Plans [Line Items]
USF Contributions	2	2	1
United Teamsters Trust Fund A
Multiemployer Plans [Line Items]
USF Contributions	2	2	2
Warehouse Employees Local 169 and Employers Joint Pension Fund
Multiemployer Plans [Line Items]
USF Contributions	1	1	1
Other funds
Multiemployer Plans [Line Items]
USF Contributions	$ 24	$ 21	$ 21
Minimum
Multiemployer Plans [Line Items]
Minimum Contribution by the employer to multi-employer plans as percentage of total contribution	5.00%

Percentage of contributions required by collective bargaining arrangement to all contributions required of employer for pension and other postretirement plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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Amount of contributions made to multiemployer plan by employer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 80
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-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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