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Accounting Policies Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
U.S. Tax Cuts and Jobs Act
Accounting Policies
Tax effects reclassified from AOCI	$ 156
Net sales | K-C Argentina
Accounting Policies
Net sales of K-C Argentina, percent		2.00%	2.00%

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