Earnings Per Share (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Reconciliation of basic net earnings per share to diluted net earnings per share
Basic net earnings per share	$ 1.47	$ 1.42	$ 3.10	$ 3.06
Average shares outstanding — basic	2,682,300,000	2,691,900,000	2,682,200,000	2,699,300,000
Potential shares exercisable under stock option plans	127,500,000	143,200,000	141,800,000	142,200,000
Less: shares which could be repurchased under treasury stock method	(89,300,000)	(94,600,000)	(96,300,000)	(93,100,000)
Convertible debt shares	800,000	1,000,000	800,000	1,000,000
Average shares outstanding — diluted	2,721,300,000	2,741,500,000	2,728,500,000	2,749,400,000
Diluted net earnings per share	$ 1.45	$ 1.40	$ 3.05	$ 3.00
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	17,000,000	0	0	0