Accounting Policies (Policy)	12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of net sales and expenses during the reporting periods. Actual results could differ from these estimates, and changes in these estimates are recorded when known. Estimates are used in accounting for, among other things, sales incentives and trade promotion allowances, employee postretirement benefits, and deferred income taxes and potential assessments.
Cash Equivalents	Cash Equivalents Cash equivalents are short-term investments with an original maturity date of three months or less.
Inventories and Distribution Costs	Inventories and Distribution Costs Most U.S. inventories are valued at the lower of cost, using the Last-In, First-Out ("LIFO") method, or market. The balance of the U.S. inventories and inventories of consolidated operations outside the U.S. are valued at the lower of cost or net realizable value using either the First-In, First-Out ("FIFO") or weighted-average cost methods. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. Distribution costs are classified as cost of products sold.
Property and Depreciation	Property and Depreciation Property, plant and equipment are stated at cost and are depreciated on the straight-line method. Buildings are depreciated over their estimated useful lives, primarily 40 years. Machinery and equipment are depreciated over their estimated useful lives, primarily ranging from 16 to 20 years. Purchases of computer software, including external costs and certain internal costs (including payroll and payroll-related costs of employees) directly associated with developing significant computer software applications for internal use, are capitalized. Computer software costs are amortized on the straight-line method over the estimated useful life of the software, which generally does not exceed 5 years. Estimated useful lives are periodically reviewed and, when warranted, changes are made to them. Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that their carrying amount may not be recoverable. An impairment loss would be indicated when estimated undiscounted future cash flows from the use and eventual disposition of an asset group, which are identifiable and largely independent of the cash flows of other asset groups, are less than the carrying amount of the asset group. Measurement of an impairment loss would be based on the excess of the carrying amount of the asset group over its fair value. Fair value is measured using discounted cash flows or independent appraisals, as appropriate. When property is sold or retired, the cost of the property and the related accumulated depreciation are removed from the consolidated balance sheet and any gain or loss on the transaction is included in income.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill represents costs in excess of fair values assigned to the underlying net assets of acquired businesses. Goodwill is not amortized, but rather is assessed for impairment annually and whenever events and circumstances indicate that impairment may have occurred. Impairment testing compares the reporting unit carrying amount, including goodwill, with its fair value. If the reporting unit carrying amount, including goodwill, exceeds its fair value, a goodwill impairment charge for the excess amount above fair value would be recorded. In our evaluation of goodwill impairment, we have the option to first assess qualitative factors such as macroeconomic, industry and competitive conditions, legal and regulatory environments, historical and projected financial performance, significant changes in the reporting unit and the magnitude of excess fair value over carrying amount from the previous quantitative impairment testing. If the qualitative assessment determines that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, then a quantitative impairment test using discounted cash flows to estimate fair value must be performed. On the other hand, if the qualitative assessment determines that it is more likely than not that the fair value of a reporting unit is more than its carrying value, then further quantitative testing is not required. For 2020, we completed the required annual assessment of goodwill for impairment for all of our reporting units using a qualitative assessment as of the first day of the third quarter, and we determined that it is more likely than not that the fair value is more than the carrying amount for each of our reporting units. Indefinite-lived intangible assets, other than goodwill, consist of certain brand names related to our acquisition of Softex Indonesia and are tested for impairment annually at the same time as our goodwill impairment assessment and whenever events and circumstances indicate that impairment may have occurred. Our estimate of the fair value of our brand assets is based on a discounted cash flow model and a market-based approach using inputs which include projected revenues from our long-range plan, assumed royalty rates that could be payable if we did not own the brands, and a discount rate. Intangible assets with finite lives are amortized over their estimated useful lives and are reviewed for impairment whenever events or changes in circumstances indicate that their carrying amount may not be recoverable. An impairment loss would be indicated when estimated undiscounted future cash flows from the use of the asset are less than its carrying amount. An impairment loss would be measured as the difference between the fair value (based on discounted future cash flows) and the carrying amount of the asset. Estimated useful lives range from 10 to 20 years for trademarks and 15 to 20 years for certain acquired distributor and customer relationships.
Investments in Equity Companies	Investments in Equity Companies Investments in companies which we do not control but over which we have the ability to exercise significant influence and that, in general, are at least 20 percent-owned by us, are stated at cost plus equity in undistributed net income. These investments are evaluated for impairment when warranted. An impairment loss would be recorded whenever a decline in value of an equity investment below its carrying amount is determined to be other than temporary. In judging "other than temporary," we would consider the length of time and extent to which the fair value of the equity company investment has been less than the carrying amount, the near-term and longer-term operating and financial prospects of the equity company, and our longer-term intent of retaining the investment in the equity company.
Revenue Recognition	Revenue Recognition Sales revenue is recognized at the time of product shipment or delivery, depending on when control passes, to unaffiliated customers, and when all of the following have occurred: a firm sales agreement is in place, pricing is fixed or determinable, and collection is reasonably assured. Sales are reported net of returns, consumer and trade promotions, rebates and freight allowed. Taxes imposed by governmental authorities on our revenue-producing activities with customers, such as sales taxes and value-added taxes, are excluded from net sales.
Sales Incentives and Trade Promotion Allowances	Sales Incentives and Trade Promotion Allowances The cost of promotion activities provided to customers is classified as a reduction in sales revenue. In addition, the estimated redemption value of consumer coupons and related expense are recorded when the related revenue from customers is realized. Rebate and promotion accruals are based on estimates of the quantity of customer sales. Promotion accruals also consider estimates of the number of consumer coupons that will be redeemed and timing and costs of activities within the promotional programs.
Advertising Expense	Advertising Expense Advertising costs are expensed in the year the related advertisement or campaign is first presented through traditional or digital media. For interim reporting purposes, advertising expenses are charged to operations as a percentage of sales based on estimated sales and related advertising expense for the full year.
Research Expense	Research Expense Research and development costs are charged to expense as incurred.
Foreign Currency Translation	Foreign Currency Translation The income statements of foreign operations, other than those in highly inflationary economies, are translated into U.S. dollars at rates of exchange in effect each month. The balance sheets of these operations are translated at period-end exchange rates, and the differences from historical exchange rates are reflected in stockholders' equity as unrealized translation adjustments.
Highly Inflationary Accounting in Argentina	As of July 1, 2018, we elected to adopt highly inflationary accounting for our subsidiaries in Argentina (“K-C Argentina”). The effect of changes in exchange rates on peso-denominated monetary assets and liabilities has been reflected in earnings in Other (income) and expense, net and was not material. As of December 31, 2020, K-C Argentina had a small net peso monetary position. Net sales of K-C Argentina were approximately 1 percent of our consolidated net sales in 2020, 2019 and 2018
Derivative Instruments and Hedging	Derivative Instruments and Hedging Our policies allow the use of derivatives for risk management purposes and prohibit their use for speculation. Our policies also prohibit the use of any leveraged derivative instrument. Consistent with our policies, foreign currency derivative instruments, interest rate swaps and locks, and the majority of commodity hedging contracts are entered into with major financial institutions. At inception, we formally designate certain derivatives as cash flow, fair value or net investment hedges and establish how the effectiveness of these hedges will be assessed and measured. This process links the derivatives to the transactions or financial balances they are hedging. Changes in the fair value of derivatives not designated as hedging instruments are recorded in earnings as they occur. All derivative instruments are recorded as assets or liabilities on the balance sheet at fair value. Changes in the fair value of derivatives are either recorded in the income statement or other comprehensive income, as appropriate. The gain or loss on derivatives designated as fair value hedges and the offsetting loss or gain on the hedged item attributable to the hedged risk are included in income in the period that changes in fair value occur. The gain or loss on derivatives designated as cash flow hedges is included in other comprehensive income in the period that changes in fair value occur, and is reclassified to income in the same period that the hedged item affects income. The gain or loss on derivatives designated as hedges of investments in foreign subsidiaries is recognized in other comprehensive income to offset the change in value of the net investments being hedged. Certain foreign-currency derivative instruments not designated as hedging instruments have been entered into to manage certain non-functional currency denominated monetary assets and liabilities. The gain or loss on these derivatives is included in income in the period that changes in their fair values occur. Cash flows from derivatives are classified within the consolidated statement of cash flows in the same category as the items being hedged. Cash flows from derivatives are classified within Operating Activities, except for derivatives designated as net investment hedges which are classified in Investing Activities. See Note 11 for disclosures about derivative instruments and hedging activities.

Accounting Policies (Policy)

12 Months Ended

Dec. 31, 2020

The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of net sales and expenses during the reporting periods. Actual results could differ from these estimates, and changes in these estimates are recorded when known. Estimates are used in accounting for, among other things, sales incentives and trade promotion allowances, employee postretirement benefits, and deferred income taxes and potential assessments.

Cash Equivalents

Cash equivalents are short-term investments with an original maturity date of three months or less.

Inventories and Distribution Costs

Most U.S. inventories are valued at the lower of cost, using the Last-In, First-Out ("LIFO") method, or market. The balance of the U.S. inventories and inventories of consolidated operations outside the U.S. are valued at the lower of cost or net realizable value using either the First-In, First-Out ("FIFO") or weighted-average cost methods. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. Distribution costs are classified as cost of products sold.

Property and Depreciation

Property, plant and equipment are stated at cost and are depreciated on the straight-line method. Buildings are depreciated over their estimated useful lives, primarily 40 years. Machinery and equipment are depreciated over their estimated useful lives, primarily ranging from 16 to 20 years. Purchases of computer software, including external costs and certain internal costs (including payroll and payroll-related costs of employees) directly associated with developing significant computer software applications for internal use, are capitalized. Computer software costs are amortized on the straight-line method over the estimated useful life of the software, which generally does not exceed 5 years.

Estimated useful lives are periodically reviewed and, when warranted, changes are made to them. Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that their carrying amount may not be recoverable. An impairment loss would be indicated when estimated undiscounted future cash flows from the use and eventual disposition of an asset group, which are identifiable and largely independent of the cash flows of other asset groups, are less than the carrying amount of the asset group. Measurement of an impairment loss would be based on the excess of the carrying amount of the asset group over its fair value. Fair value is measured using discounted cash flows or independent appraisals, as appropriate. When property is sold or retired, the cost of the property and the related accumulated depreciation are removed from the consolidated balance sheet and any gain or loss on the transaction is included in income.

Goodwill and Other Intangible Assets

Goodwill represents costs in excess of fair values assigned to the underlying net assets of acquired businesses. Goodwill is not amortized, but rather is assessed for impairment annually and whenever events and circumstances indicate that impairment may have occurred. Impairment testing compares the reporting unit carrying amount, including goodwill, with its fair value. If the reporting unit carrying amount, including goodwill, exceeds its fair value, a goodwill impairment charge for the excess amount above fair value would be recorded. In our evaluation of goodwill impairment, we have the option to first assess qualitative factors such as macroeconomic, industry and competitive conditions, legal and regulatory environments, historical and

projected financial performance, significant changes in the reporting unit and the magnitude of excess fair value over carrying amount from the previous quantitative impairment testing. If the qualitative assessment determines that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, then a quantitative impairment test using discounted cash flows to estimate fair value must be performed. On the other hand, if the qualitative assessment determines that it is more likely than not that the fair value of a reporting unit is more than its carrying value, then further quantitative testing is not required. For 2020, we completed the required annual assessment of goodwill for impairment for all of our reporting units using a qualitative assessment as of the first day of the third quarter, and we determined that it is more likely than not that the fair value is more than the carrying amount for each of our reporting units.

Indefinite-lived intangible assets, other than goodwill, consist of certain brand names related to our acquisition of Softex Indonesia and are tested for impairment annually at the same time as our goodwill impairment assessment and whenever events and circumstances indicate that impairment may have occurred. Our estimate of the fair value of our brand assets is based on a discounted cash flow model and a market-based approach using inputs which include projected revenues from our long-range plan, assumed royalty rates that could be payable if we did not own the brands, and a discount rate.

Intangible assets with finite lives are amortized over their estimated useful lives and are reviewed for impairment whenever events or changes in circumstances indicate that their carrying amount may not be recoverable. An impairment loss would be indicated when estimated undiscounted future cash flows from the use of the asset are less than its carrying amount. An impairment loss would be measured as the difference between the fair value (based on discounted future cash flows) and the carrying amount of the asset. Estimated useful lives range from 10 to 20 years for trademarks and 15 to 20 years for certain acquired distributor and customer relationships.

Investments in Equity Companies

Investments in companies which we do not control but over which we have the ability to exercise significant influence and that, in general, are at least 20 percent-owned by us, are stated at cost plus equity in undistributed net income. These investments are evaluated for impairment when warranted. An impairment loss would be recorded whenever a decline in value of an equity investment below its carrying amount is determined to be other than temporary. In judging "other than temporary," we would consider the length of time and extent to which the fair value of the equity company investment has been less than the carrying amount, the near-term and longer-term operating and financial prospects of the equity company, and our longer-term intent of retaining the investment in the equity company.

Revenue Recognition

Sales revenue is recognized at the time of product shipment or delivery, depending on when control passes, to unaffiliated customers, and when all of the following have occurred: a firm sales agreement is in place, pricing is fixed or determinable, and collection is reasonably assured. Sales are reported net of returns, consumer and trade promotions, rebates and freight allowed. Taxes imposed by governmental authorities on our revenue-producing activities with customers, such as sales taxes and value-added taxes, are excluded from net sales.

Sales Incentives and Trade Promotion Allowances

The cost of promotion activities provided to customers is classified as a reduction in sales revenue. In addition, the estimated redemption value of consumer coupons and related expense are recorded when the related revenue from customers is realized. Rebate and promotion accruals are based on estimates of the quantity of customer sales. Promotion accruals also consider estimates of the number of consumer coupons that will be redeemed and timing and costs of activities within the promotional programs.

Advertising Expense

Advertising costs are expensed in the year the related advertisement or campaign is first presented through traditional or digital media. For interim reporting purposes, advertising expenses are charged to operations as a percentage of sales based on estimated sales and related advertising expense for the full year.

Research Expense

Research and development costs are charged to expense as incurred.

Foreign Currency Translation

The income statements of foreign operations, other than those in highly inflationary economies, are translated into U.S. dollars at rates of exchange in effect each month. The balance sheets of these operations are translated at period-end exchange rates, and the differences from historical exchange rates are reflected in stockholders' equity as unrealized translation adjustments.

Highly Inflationary Accounting in Argentina

As of July 1, 2018, we elected to adopt highly inflationary accounting for our subsidiaries in Argentina (“K-C Argentina”). The effect of changes in exchange rates on peso-denominated monetary assets and liabilities has been reflected in earnings in Other (income) and expense, net and was not material. As of December 31, 2020, K-C Argentina had a small net peso monetary position. Net sales of K-C Argentina were approximately 1 percent of our consolidated net sales in 2020, 2019 and 2018

Derivative Instruments and Hedging

Our policies allow the use of derivatives for risk management purposes and prohibit their use for speculation. Our policies also prohibit the use of any leveraged derivative instrument. Consistent with our policies, foreign currency derivative instruments, interest rate swaps and locks, and the majority of commodity hedging contracts are entered into with major financial institutions. At inception, we formally designate certain derivatives as cash flow, fair value or net investment hedges and establish how the effectiveness of these hedges will be assessed and measured. This process links the derivatives to the transactions or financial balances they are hedging. Changes in the fair value of derivatives not designated as hedging instruments are recorded in earnings as they occur. All derivative instruments are recorded as assets or liabilities on the balance sheet at fair value. Changes in the fair value of derivatives are either recorded in the income statement or other comprehensive income, as appropriate. The gain or loss on derivatives designated as fair value hedges and the offsetting loss or gain on the hedged item attributable to the hedged risk are included in income in the period that changes in fair value occur. The gain or loss on derivatives designated as cash flow hedges is included in other comprehensive income in the period that changes in fair value occur, and is reclassified to income in the same period that the hedged item affects income. The gain or loss on derivatives designated as hedges of investments in foreign subsidiaries is recognized in other comprehensive income to offset the change in value of the net investments being hedged. Certain foreign-currency derivative instruments not designated as hedging instruments have been entered into to manage certain non-functional currency denominated monetary assets and liabilities. The gain or loss on these derivatives is included in income in the period that changes in their fair values occur. Cash flows from derivatives are classified within the consolidated statement of cash flows in the same category as the items being hedged. Cash flows from derivatives are classified within Operating Activities, except for derivatives designated as net investment hedges which are classified in Investing Activities. See Note 11 for disclosures about derivative instruments and hedging activities.