Earnings Per Share (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Reconciliation of basic net earnings per share to diluted net earnings per share
Basic net earnings per share	$ 1.47	$ 1.40	$ 4.57	$ 4.46
Average shares outstanding — basic	2,683,200,000	2,684,600,000	2,682,600,000	2,694,400,000
Potential shares exercisable under stock option plans	140,300,000	139,300,000	140,900,000	141,200,000
Less: shares which could be repurchased under treasury stock method	(96,700,000)	(87,200,000)	(94,700,000)	(90,200,000)
Convertible debt shares	800,000	1,000,000	800,000	1,000,000
Average shares outstanding — diluted	2,727,600,000	2,737,700,000	2,729,600,000	2,746,400,000
Diluted net earnings per share	$ 1.44	$ 1.37	$ 4.49	$ 4.37
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	0	0