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Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Scenario, Forecast
Lease Right-of-Use Asset and Liability	$ 500
K-C Venezuela | Other Income
Deconsolidation, Gain (Loss)				$ 11
Trademarks | Minimum
Intangible assets estimated useful life		2 years
Trademarks | Maximum
Intangible assets estimated useful life		20 years
Patents, Developed Technologies & Other Intangible Assets | Minimum
Intangible assets estimated useful life		5 years
Patents, Developed Technologies & Other Intangible Assets | Maximum
Intangible assets estimated useful life		15 years
Building
Estimated useful life		40 years
Machinery and Equipment | Minimum
Estimated useful life		16 years
Machinery and Equipment | Maximum
Estimated useful life		20 years
Software
Estimated useful life		5 years
Net Sales Percentage to One Customer | K-C Argentina
Concentration Risk, Percentage		2.00%	2.00%	2.00%
U.S. Tax Cuts and Job Act
Tax effects relcassified from AOCI		$ 156
Retained Earnings
Immaterial Error Correction					$ 960
Treasury Stock
Immaterial Error Correction					(968)
Additional Paid-in Capital
Immaterial Error Correction					$ 8

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