Income Taxes Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 21, 2020	Mar. 23, 2019
Income Tax Disclosure [Abstract]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)	$ 0	$ (29)
Net tax (benefit)/expense related to the TCJ Act per share		$ (0.02)

Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Name:	us-gaap_TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration