Our Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Capitalized Computer Software, Net	$ 664	$ 572
Capitalized Computer Software, Amortization	152	166	$ 204
Shipping and handling expenses	11,900	10,900	10,500
Research and development costs	719	711	680
Amount of prepaid incentive arrangements	299	272
Advertising and other marketing activities	4,600	4,700	4,200
Advertising expenses	3,000	3,000	2,600
Deferred advertising costs	48	55
Reserve for Product Returns Novel Coronavirus (COVID-19) Impact	20
Prepaid Incentives Novel Coronavirus (COVID-19) Impact	59
Accounts Receivable, Credit Loss Expense (reversal) Novel Coronavirus (COVID-19) Impact	56
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (Pre-Tax)	44	$ 0	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (After-Tax)	$ 34		$ 137
Credit Terms, Receivables [Abstract]
Credit Terms, Receivable U.S.	30 days
Credit Terms, Receivables International (Outside U.S.) Maximum	90 days
Credit Terms, Receivables International (Outside U.S.) minimum	30 days