Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Non-cash Investing and Financing Activities [Abstract]
Declared but unpaid dividends	$ 78	$ 70
Issuance of stock upon vesting of restricted stock units	76	66
Cash and Cash Equivalents	2,288		$ 2,103
Restricted Cash Included in Other Current Assets	24		12
Restricted Cash Included in Other Assets	2		2
Cash, Cash Equivalents and Restricted Cash	$ 2,314	$ 956	$ 2,117	$ 1,361
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