Income Taxes (Narrative) (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
Income Tax Contingency [Line Items]
Deferred Tax Assets, Goodwill and Intangible Assets							$ 793	$ 985		$ 793	$ 985
International Audit										$ 364
International Audit, per share										$ 0.26
Federal Audit Settlement										$ 353
Federal Audit Settlement, Net of tax, Per share amount										$ 0.24
Federal Statutory Tax Rate, Pre TCJ Act							35.00%			35.00%
Federal Statutory Tax Rate, Post TCJ Act							21.00%			21.00%
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)	$ 0	$ 0	$ 29	$ (76)	$ (777)	$ (1)	$ (21)	882	$ (2,500)	$ 8	$ 28
Net tax (benefit)/expense related to the TCJ Act per share									$ (1.70)	$ (0.01)	$ 0.02
Total gross amount of reserves for income taxes							1,400			$ 1,400
Interest accrued							250	$ 179		250	$ 179
Interest accrued recognized										(84)	$ (64)
Operating loss carryforwards							24,700			24,700
Income tax undistributed international earnings							6,000			6,000
Mandatory OneTime Repatriation TCJ ACT										4,000
Remeasurement of Deferred Taxes TCJ Act										1,500
Foreign Earnings Repatriated										$ 20,400
Effective Income Tax Rate Reconciliation, Percent										21.00%	(36.70%)	48.90%
undistributed earnings of foreign subsidiaries, post distribution							6,000			$ 6,000
Transition tax liability										3,300
Transition tax, expected payments							100			100
International reorganization DTA											$ 4,300
international Reorganization DTA, per share											$ 3.05
International Reorganization Other DTA										$ 4,400
International Reorganization Other DTA, amortization period										15 years
Expire in 2016
Income Tax Contingency [Line Items]
Operating loss carryforwards							200			$ 200
Expire Between 2017 and 2035 Years
Income Tax Contingency [Line Items]
Operating loss carryforwards							20,300			20,300
Carried Forward Indefinitely
Income Tax Contingency [Line Items]
Operating loss carryforwards							$ 4,200			$ 4,200