Income Taxes (Income Taxes) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						4 Months Ended			12 Months Ended
	Sep. 07, 2019	Jun. 15, 2019	Mar. 23, 2019	Sep. 08, 2018	Jun. 16, 2018	Mar. 24, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Tax Contingency [Line Items]
Federal and International Audit Settlements											$ 717
Impact of Swiss Tax Reform										$ 24
Transition tax, payments made										663	150
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)	$ 0	$ 0	$ (29)	$ 76	$ 777	$ 1	$ 21	$ (882)	$ 2,500	(8)	(28)
Mandatory OneTime Repatriation TCJ ACT										4,000
Federal Statutory Tax Rate, Pre TCJ Act													35.00%
Income before income taxes in U.S										4,123	3,864	$ 3,452
Income before income taxes in Foreign										5,189	5,325	6,150
Income before income taxes										9,312	9,189	9,602
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current: U.S. Federal										652	437	4,925
Current: Foreign										807	378	724
Current: State										196	63	136
Provision for income taxes, Current total										1,655	878	5,785
Deferred: U.S. Federal										325	140	(1,159)
Deferred: Foreign										(31)	(4,379)	(9)
Deferred: State										10	(9)	77
Provision for income taxes, Deferred total										304	(4,248)	(1,091)
Provision for income taxes	$ 559	$ 524	446	$ 188	$ 1,070	304	430	(4,932)		$ 1,959	$ (3,370)	$ 4,694
U.S. Federal statutory tax rate
U.S. Federal statutory tax rate										21.00%	21.00%	35.00%
State income tax, net of U.S. Federal tax benefit										1.60%	0.50%	0.90%
Lower taxes on foreign results										(0.90%)	(2.20%)	(9.40%)
Provisional One Time Mandatory Repatriation TCJ Act, Percent										(0.10%)	0.10%	41.40%
Remeasurement of Deferred Taxes TCJ Act, Percent										0.00%	(0.40%)	(15.90%)
International Reorganization										0.00%	(47.30%)	0.00%
Tax benefits										0.00%	(7.80%)	0.00%
Other, net										(0.60%)	(0.60%)	(3.10%)
Annual tax rate										21.00%	(36.70%)	48.90%
Deferred tax liabilities
Debt guarantee of wholly-owned subsidiary													$ 578	$ 578
Property, plant and equipment													1,583	1,303
Deferred tax liability, recapture of NOL													335	414
Deferred Tax - Lease liability										$ 345	$ 0
Other													167	71
Gross deferred tax liabilities													3,008	2,366
Deferred tax assets
Net carryforwards													4,168	4,353
Deferred Tax Assets, Goodwill and Intangible Assets													793	985
Share-based compensation													94	106
Retiree medical benefits													154	167
Other employee-related benefits													350	303
Pension benefits													104	221
Deductible state tax and interest benefits													126	110
Deferred Tax - Right of Use Asset										345	0
Other													741	739
Gross deferred tax assets													6,875	6,984
Valuation allowances			(3,753)			(1,163)	(3,599)	(3,753)	(1,163)	(3,753)	(1,163)	$ (1,110)	(3,599)	(3,753)	$ (1,163)
Deferred tax assets, net													3,276	3,231
Valuation Allowance [Abstract]
Balance, beginning of year			$ (3,753)			$ (1,163)				(3,753)	(1,163)	(1,110)
Provision													(124)	2,639	$ 33
Other (deductions)/additions										(30)	(49)	20
Balance, end of year							$ (3,599)	$ (3,753)	$ (1,163)	$ (3,599)	$ (3,753)	$ (1,163)
Net tax (benefit)/expense related to the TCJ Act per share									$ 1.70	$ 0.01	$ (0.02)
Federal and International Audit Settlements, per share amount											$ 0.50
Deferred Tax Assets, Net													$ (268)	$ (865)