Employees' Stock Incentive Plans Schedule of Compensation Costs Related to Equity Plans (Details) - All Equity Awards - USD ($) $ in Millions	12 Months Ended
Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation cost	$ 156	$ 46	$ 33
Related tax benefit	33	9	7
After-tax compensation cost	$ 123	$ 37	$ 26

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

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