Income taxes.

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Tax cuts and jobs act, alternative minimum tax, credits refunded.

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Tax cuts and jobs act, alternative minimum tax, percentage of uncredited balances received by taxpayers.

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Tax cuts and jobs act, alternative minimum tax, tax year description.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.Fact.4)
-URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817

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Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 26, 2020	Jun. 27, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 26, 2020
Income Taxes [Line Items]
Effective income tax rate reconciliation, at federal statutory income tax rate, percent	21.00%			21.00%
Effective tax rate	42.00%		35.00%	(9.00%)	39.00%
Tax cuts and jobs act, alternative minimum tax, tax year description				For tax years 2018 through 2020, taxpayers could receive 50% of their uncredited balances as a cash refund with any remaining amounts refunded in full in 2021.
Tax cuts and jobs act, alternative minimum tax, percentage of uncredited balances received by taxpayers				50.00%
Tax cuts and jobs act, alternative minimum tax, credits refunded	$ 44	$ 22
Decrease related to current year tax positions				$ 1
Scenario Forecast
Income Taxes [Line Items]
Tax cuts and jobs act, alternative minimum tax, percentage of uncredited balances received by taxpayers						100.00%
Tax cuts and jobs act, alternative minimum tax, credits refunded						$ 44
Maximum
Income Taxes [Line Items]
Tax cuts and jobs act, alternative minimum tax, credits refunded	$ 22