Accumulated Other Comprehensive Loss - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended						8 Months Ended
	Sep. 05, 2020	Jun. 13, 2020	Mar. 21, 2020	Sep. 07, 2019	Jun. 15, 2019	Mar. 23, 2019	Sep. 05, 2020	Sep. 07, 2019	Dec. 28, 2019	Dec. 29, 2018
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Post retirement Plans Taxes	$ 1,340	$ 1,337	$ 1,356	$ 1,437	$ 1,454	$ 1,465	$ 1,340	$ 1,437	$ 1,370	$ 1,466
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(12,426)	(12,840)	(12,044)	(11,969)	(11,810)	(11,445)	(12,426)	(11,969)	(11,290)	(11,918)
Losses/(gains) on cash flow hedges:
Total before tax	(100)	(127)	157	43	29	(15)	(70)	57
Tax amounts	25			(11)			17	(13)
Net (gains)/losses after tax	(75)			32			(53)	44
Amortization of pension and retiree medical items:
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	0			(2)			0	(6)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	55			38			162	113
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	0			18			0	18
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	55	57	50	54	37	34	162	125
Tax amounts	(12)			(12)			(34)	(27)
Net losses after tax	43			42			128	98
Total net (gains)/losses reclassified, net of tax	(32)			74			75	142
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(40)	(51)	(64)	16	54	60	(40)	16	(3)	87
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(2,869)	(2,868)	(2,931)	(3,156)	(3,212)	(3,254)	(2,869)	(3,156)	(2,988)	(3,271)
Accumulated Other Comprehensive Income Loss Other	(22)	(19)	(18)	(17)	(16)	(17)	(22)	(17)	(19)	(17)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(15,357)	(15,778)	(15,057)	(15,126)	(14,984)	(14,656)	(15,357)	(15,126)	$ (14,300)	$ (15,119)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	385	(827)	(735)	(149)	(365)	475
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	115	144	(236)	(95)	(37)	(20)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	(59)	25	21	19	16	(16)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(3)	(1)	1	(1)	1	0
OCI, before Reclassifications, before Tax, Attributable to Parent	438	(659)	(949)	(226)	(385)	439
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	0	0	0	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	0	0	0	0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	(45)	(70)	207	97	66	19
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	385	(827)	(735)	(149)	(365)	475
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	15	17	(79)	(52)	(8)	(35)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	(4)	82	71	73	53	18
Other Comprehensive Income, Other, Before Tax	(3)	(1)	1	(1)	1	0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	393	(729)	(742)	(129)	(319)	458
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	29	31	(19)	(10)	0	(2)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(4)	(4)	18	14	2	8
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	3	(19)	(14)	(17)	(11)	(1)
Other Comprehensive Income, Other, Taxes	0	0	0	0	0	0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	28	$ 8	$ (15)	(13)	$ (9)	$ 5
Cash Flow Hedges
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges	(100)			43			(70)	57
Amortization of pension and retiree medical items:
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(3)			(55)			(136)	(97)
Cash Flow Hedges | Foreign exchange contracts
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges	(22)			4			(37)	0
Amortization of pension and retiree medical items:
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(31)			2			47	(16)
Cash Flow Hedges | Foreign exchange contracts | Revenue, Net [Member]
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges	0			0			0	1
Cash Flow Hedges | Foreign exchange contracts | Cost of sales
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges	(22)			4			(37)	(1)
Cash Flow Hedges | Interest rate derivatives
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges	(102)			38			(73)	54
Amortization of pension and retiree medical items:
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	117			(65)			24	(117)
Cash Flow Hedges | Interest rate derivatives | Interest Expense
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges	(102)			38			(73)	54
Cash Flow Hedges | Commodity contracts
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges	24			1			40	3
Amortization of pension and retiree medical items:
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	29			(32)			(48)	(19)
Cash Flow Hedges | Commodity contracts | Cost of sales
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges	22			0			36	2
Cash Flow Hedges | Commodity contracts | Selling, general and administrative expenses
Losses/(gains) on cash flow hedges:
Losses/(gains) on cash flow hedges	$ 2			$ 1			$ 4	$ 1