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Earnings Per Share (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Reconciliation of basic net earnings per share to diluted net earnings per share
Basic net earnings per share	$ 2.11	$ 1.47	$ 3.52	$ 3.10
Average shares outstanding — basic	2,652,500,000	2,682,300,000	2,656,700,000	2,682,200,000
Potential shares exercisable under stock option plans	140,800,000	127,500,000	138,600,000	141,800,000
Less: shares which could be repurchased under treasury stock method	(102,300,000)	(89,300,000)	(99,000,000.0)	(96,300,000)
Convertible debt shares	700,000	800,000	700,000	800,000
Average shares outstanding — diluted	2,691,700,000	2,721,300,000	2,697,000,000.0	2,728,500,000
Diluted net earnings per share	$ 2.08	$ 1.45	$ 3.47	$ 3.05
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		17,000,000		0

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