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Income Taxes (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 4 Months Ended 12 Months Ended
Dec. 30, 2017
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Income Tax Contingency [Line Items]        
Deferred Tax Assets, Goodwill and Intangible Assets   $ 1,146 $ 793  
International Audit   $ 364    
International Audit, per share   $ 0.26    
Federal Audit Settlement   $ 353    
Federal Audit Settlement, Net of tax, Per share amount   $ 0.24    
Federal Statutory Tax Rate, Pre TCJ Act   35.00%    
Federal Statutory Tax Rate, Post TCJ Act   21.00%    
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) $ 2,500 $ 0 $ 8 $ 28
Net tax (benefit)/expense related to the TCJ Act per share $ 1.70   $ 0.01 $ 0.02
Total gross amount of reserves for income taxes   1,600    
Interest accrued   338 $ 250  
Interest accrued recognized   93 $ 84  
Operating loss carryforwards   28,300    
Income tax undistributed international earnings   6,000    
Foreign Earnings Repatriated   $ 20,400    
Effective Income Tax Rate Reconciliation, Percent   20.90% 21.00% (36.70%)
Transition tax liability   $ 3,200    
Transition tax, expected payments   309    
International reorganization DTA     $ 4,300  
international Reorganization DTA, per share     $ 3.05  
International Reorganization Other DTA   $ 4,400    
International Reorganization Other DTA, amortization period   15 years    
Transition tax, payments made   $ 78 $ 663 $ 150
Expire in 2016        
Income Tax Contingency [Line Items]        
Operating loss carryforwards   200    
Expire Between 2017 and 2035 Years        
Income Tax Contingency [Line Items]        
Operating loss carryforwards   25,200    
Carried Forward Indefinitely        
Income Tax Contingency [Line Items]        
Operating loss carryforwards   $ 2,900