Share-Based Compensation Share-Based Compensation (Narrative) (Details) shares in Millions, $ in Millions	12 Months Ended
Dec. 26, 2020 USD ($) option / rSU shares	Dec. 28, 2019 USD ($)	Dec. 29, 2018 USD ($)
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Common stock, capital shares reserved for future issuance \| shares	52
Share-based Payment Arrangement, Expense	$ 264	$ 237	$ 256
Allocated Share-Based Compensation Liability Awards	11	8	20
Restructuring, Settlement and Impairment Provisions, Share-based Compensation	(1)	(2)	(6)
Allocated Share-based Compensation Expense, After Merger/Integration and Restructuring/Impairment	274	243	270
Income tax benefits recognized in earnings related to share-based compensation	48	39	45
Unrecognized compensation cost related to nonvested share-based compensation grants	$ 300
Weighted-average period for recognizing unrecognized compensation	2 years
Acquisition-related awards remaining vesting period	3 years
Percent of liability awards granted to senior officers	34.00%
Proceeds and Excess Tax Benefit from Share-based Compensation	$ 35	$ 50	$ 48
Restricted Stock Units (RSUs)
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Award equivalence, ratio of stock options to RSUs \| option / rSU	4
Stock Options
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Stock option exercisable life	10 years
Award equivalence, ratio of stock options to RSUs \| option / rSU	1
PEP Equity Performance Unit [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Percent of equity awards granted to Senior Officers as performance-based RSUs	66.00%

Allocated Share-Based Compensation Liability Awards

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Allocated Share-based Compensation Expense, After Merger/Integration and Restructuring/Impairment

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Percent Of Equity Awards Granted To Certain Senior Executives

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Percent of liability awards granted Certain Senior Executives

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Restructuring, Settlement and Impairment Provisions, Share-based Compensation

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Share-based Compensation Arrangement by Share-based Payment Award, Award Equivalence, Ratio of Stock Options to RSUs

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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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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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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