Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 12, 2021	Mar. 20, 2021	Jun. 13, 2020	Mar. 21, 2020	Jun. 12, 2021	Jun. 13, 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	$ 1,504	$ 1,509	$ 1,337	$ 1,356	$ 1,504	$ 1,337	$ 1,514	$ 1,370
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	255	128	(827)	(735)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	0	18	0	0	18	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	255	146	(827)	(735)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	13	(15)	31	(19)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(11,541)	(11,809)	(12,840)	(12,044)	(11,541)	(12,840)	(11,940)	(11,290)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	175	97	144	(236)
Net (gains)/losses before tax	(53)	(1)	(127)	157	(54)	30
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	122	96	17	(79)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(29)	(24)	(4)	18
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	169	76	(51)	(64)	169	(51)	4	(3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	(28)	(20)	25	21
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	57	52	57	50	109	107
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	29	32	82	71
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(5)	(5)	(19)	(14)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(3,469)	(3,493)	(2,868)	(2,931)	(3,469)	(2,868)	(3,520)	(2,988)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	2	0	(1)	1
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	0	0
Other Comprehensive Income, Other, Before Tax	2	0	(1)	1
Other Comprehensive Income, Other, Taxes	0	0	0	0
Accumulated Other Comprehensive Income Loss Other	(18)	(20)	(19)	(18)	(18)	(19)	(20)	(19)
OCI, before Reclassifications, before Tax, Attributable to Parent	404	205	(659)	(949)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	4	69	(70)	207
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	408	274	(729)	(742)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(21)	(44)	8	(15)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (14,859)	$ (15,246)	$ (15,778)	$ (15,057)	$ (14,859)	$ (15,778)	$ (15,476)	$ (14,300)