Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Non-cash Investing and Financing Activities [Abstract]
Declared but unpaid dividends	$ 77	$ 69
Issuance of stock upon vesting of restricted stock units	69	61
Cash and Cash Equivalents	1,106		$ 2,103
Restricted Cash Included in Other Current Assets	21		12
Restricted Cash Included in Other Assets	1		2
Cash, Cash Equivalents and Restricted Cash	$ 1,128	$ 975	$ 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