Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 21, 2020	Mar. 23, 2019	Dec. 28, 2019	Dec. 29, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	$ 0	$ 2
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	50	36
Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Post retirement Plans Taxes	1,356	1,465	$ 1,370	$ 1,466
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(12,044)	(11,445)	(11,290)	(11,918)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(64)	60	(3)	87
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(2,931)	(3,254)	(2,988)	(3,271)
Accumulated Other Comprehensive Income Loss Other	(18)	(17)	(19)	(17)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(15,057)	(14,656)	$ (14,300)	$ (15,119)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	(735)	475
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(236)	(20)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	21	(16)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	1	0
OCI, before Reclassifications, before Tax, Attributable to Parent	(949)	439
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	157	(15)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	50	34
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	207	19
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(735)	475
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	(79)	(35)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	71	18
Other Comprehensive Income, Other, Before Tax	1	0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(742)	458
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(19)	(2)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	18	8
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(14)	(1)
Other Comprehensive Income, Other, Taxes	0	0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(15)	5
Cash Flow Hedging [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(157)	15
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(152)	(10)
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(4)	5
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 51	$ (31)