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Earnings Per Share (Details) - $ / shares	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Reconciliation of basic net earnings per share to diluted net earnings per share
Basic net earnings per share	$ 1.63	$ 1.63
Average shares outstanding — basic	2,682,200,000	2,706,600,000
Potential shares exercisable under stock option plans	139,500,000	141,200,000
Less: shares which could be repurchased under treasury stock method	(90,600,000)	(94,600,000)
Convertible debt shares	800,000	1,300,000
Average shares outstanding — diluted	2,731,900,000	2,754,500,000
Diluted net earnings per share	$ 1.60	$ 1.61
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0

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Common stock assumed to be purchased using the proceeds that could be obtained upon exercise of potential shares exercisable under stock option plans, at the average market price during the period.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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