Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Dec. 31, 2019	Dec. 31, 2018
Non-cash Investing and Financing Activities [Abstract]
Declared but unpaid dividends	$ 88	$ 77
Issuance of stock upon vesting of restricted stock units	209	179
Cash and Cash Equivalents	7,540		$ 2,399
Restricted Cash Included in Other Current Assets	29		21
Restricted Cash Included in Other Assets	1		2
Cash, Cash Equivalents and Restricted Cash	$ 7,570	$ 1,305	$ 2,422	$ 2,117
Restricted Cash and Cash Equivalents, Current, Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsCurrent
Restricted Cash and Cash Equivalents, Noncurrent, Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent