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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss Roll Forward (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 20, 2021
Mar. 21, 2020
Dec. 26, 2020
Dec. 28, 2019
Statement of Other Comprehensive Income [Abstract]        
Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Post retirement Plans Taxes $ 1,509 $ 1,356 $ 1,514 $ 1,370
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax 128 (735)    
Divestiture 18 0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax 146 (735)    
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax (15) (19)    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (11,809) (12,044) (11,940) (11,290)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax 97 (236)    
Net (gains)/losses before tax (1) 157    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax 96 (79)    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax (24) 18    
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax 76 (64) 4 (3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax (20) 21    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax 52 50    
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax 32 71    
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax (5) (14)    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (3,493) (2,931) (3,520) (2,988)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 0 1    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0    
Other Comprehensive Income, Other, Before Tax 0 1    
Other Comprehensive Income, Other, Taxes 0 0    
Accumulated Other Comprehensive Income Loss Other (20) (18) (20) (19)
OCI, before Reclassifications, before Tax, Attributable to Parent 205 (949)    
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 69 207    
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent 274 (742)    
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (44) (15)    
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (15,246) $ (15,057) $ (15,476) $ (14,300)