PPG Industries (PPG) 10-K 20 Feb 20 2019 FY Annual report Financial data

Cover

Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 31, 2020	Jun. 30, 2019
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2019
Entity File Number	1-1687
Entity Registrant Name	PPG INDUSTRIES, INC.
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	25-0730780
Entity Address, Address Line One	One PPG Place
Entity Address, City or Town	Pittsburgh
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15272
City Area Code	412
Local Phone Number	434-3131
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 27,547
Entity Common Stock, Shares Outstanding		235,755,928
Documents Incorporated by Reference	R
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Central Index Key	0000079879
Current Fiscal Year End Date	--12-31
Common Stock – Par Value $1.66 2/3
Entity Information [Line Items]
Title of 12(b) Security	Common Stock – Par Value $1.66 2/3
Trading Symbol	PPG
Security Exchange Name	NYSE
0.875% Notes due 2022
Entity Information [Line Items]
Title of 12(b) Security	0.875% Notes due 2022
Trading Symbol	PPG 22
Security Exchange Name	NYSE
0.875% Notes due 2025
Entity Information [Line Items]
Title of 12(b) Security	0.875% Notes due 2025
Trading Symbol	PPG 25
Security Exchange Name	NYSE
1.400% Notes due 2027
Entity Information [Line Items]
Title of 12(b) Security	1.400% Notes due 2027
Trading Symbol	PPG 27
Security Exchange Name	NYSE

Consolidated Statement of Incom

Consolidated Statement of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 15,146	$ 15,374	$ 14,748
Cost of sales, exclusive of depreciation and amortization	8,653	9,001	8,209
Selling, general and administrative	3,604	3,573	3,554
Depreciation	375	354	331
Amortization	136	143	129
Research and development, net	432	441	451
Interest expense	132	118	105
Interest income	(32)	(23)	(20)
Business restructuring, net	176	66	0
Pension settlement charges	0	0	60
Other charges	98	122	74
Other income	(89)	(114)	(150)
Income before income taxes	1,661	1,693	2,005
Income tax expense	392	353	615
Income from continuing operations	1,269	1,340	1,390
Income from discontinued operations, net of tax	0	18	225
Net income attributable to the controlling and noncontrolling interests	1,269	1,358	1,615
Less: Net income attributable to noncontrolling interests	26	17	21
Net income (attributable to PPG)	1,243	1,341	1,594
Income from continuing operations, net of tax	1,243	1,323	1,369
Income from discontinued operations, net of tax	$ 0	$ 18	$ 225
Earnings per common share
Continuing operations (in dollars per share)	$ 5.25	$ 5.43	$ 5.34
Discontinued operations (in dollars per share)	0	0.07	0.88
Net Income (attributable to PPG) (in dollars per share)	5.25	5.50	6.22
Earnings per common share - assuming dilution
Continuing operations (in dollars per share)	5.22	5.40	5.31
Discontinued operations (in dollars per share)	0	0.07	0.87
Net Income (attributable to PPG) (in dollars per share)	$ 5.22	$ 5.47	$ 6.18

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income attributable to the controlling and noncontrolling interests	$ 1,269	$ 1,358	$ 1,615
Defined benefit pension and other postretirement benefit adjustments	(156)	9	78
Unrealized foreign currency translation adjustments	106	(155)	248
Derivative financial instruments	(1)	(1)	(10)
Other comprehensive (loss)/income, net of tax	(51)	(147)	316
Total comprehensive income	1,218	1,211	1,931
Less: amounts attributable to noncontrolling interests:
Net income	(26)	(17)	(21)
Unrealized foreign currency translation adjustments	1	11	(17)
Comprehensive income attributable to PPG	$ 1,193	$ 1,205	$ 1,893

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 1,216	$ 902
Short-term investments	57	61
Receivables	2,756	2,845
Inventories	1,710	1,783
Other	431	370
Total current assets	6,170	5,961
Property, plant and equipment, net	2,983	2,805
Goodwill	4,470	4,070
Identifiable intangible assets, net	2,131	1,972
Deferred income taxes	220	229
Investments	258	251
Operating lease, right-of-use asset	782	0
Other assets	694	727
Total	17,708	16,015
Current liabilities
Accounts payable and accrued liabilities	3,496	3,623
Restructuring reserves	196	99
Short-term debt and current portion of long-term debt	513	651
Current portion of operating lease liabilities	170	0
Total current liabilities	4,375	4,373
Long-term debt	4,539	4,365
Operating lease liabilities	622	0
Accrued pensions	745	645
Other postretirement benefits	661	629
Deferred income taxes	452	429
Other liabilities	911	842
Total liabilities	12,305	11,283
Commitments and contingent liabilities (See Note 14)
Shareholders’ equity
Common stock	969	969
Additional paid-in capital	950	788
Retained earnings	18,906	18,131
Treasury stock, at cost	(13,191)	(12,958)
Accumulated other comprehensive loss	(2,350)	(2,300)
Total PPG shareholders’ equity	5,284	4,630
Noncontrolling interests	119	102
Total shareholders’ equity	5,403	4,732
Total	$ 17,708	$ 16,015

Consolidated Statement of Share

Consolidated Statement of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive (Loss)/Income	Total PPG	Non-controlling Interests
Beginning balance at Dec. 31, 2016	$ 4,915	$ 969	$ 707	$ 15,980	$ (10,472)	$ (2,356)	$ 4,828	$ 87
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the controlling and noncontrolling interests	1,615			1,594			1,594	21
Other comprehensive loss, net of tax	316					299	299	17
Cash dividends	(434)			(434)			(434)
Purchase of treasury stock	(813)				(813)		(813)
Issuance of treasury stock	83		49		34		83
Dividends paid on subsidiary common stock to noncontrolling interests	(5)							(5)
Reductions in noncontrolling interests	(5)							(5)
Ending balance at Dec. 31, 2017	5,672	969	756	17,140	(11,251)	(2,057)	5,557	115
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the controlling and noncontrolling interests	1,358			1,341			1,341	17
Other comprehensive loss, net of tax	(147)					(136)	(136)	(11)
Cash dividends	(453)			(453)			(453)
Purchase of treasury stock	(1,721)				(1,721)		(1,721)
Issuance of treasury stock	42		28		14		42
Stock-based compensation activity	4		4				4
Dividends paid on subsidiary common stock to noncontrolling interests	(7)							(7)
Reductions in noncontrolling interests	(12)		0				0	(12)
Reclassifications of Temporary to Permanent Equity				107		(107)
Ending balance at Dec. 31, 2018	4,732	969	788	18,131	(12,958)	(2,300)	4,630	102
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	(4)	0	0	(4)	0	0	(4)	0
Net income attributable to the controlling and noncontrolling interests	1,269			1,243			1,243	26
Other comprehensive loss, net of tax	(51)					(50)	(50)	(1)
Cash dividends	(468)			(468)			(468)
Purchase of treasury stock	(325)				(325)		(325)
Issuance of treasury stock	243		151		92		243
Stock-based compensation activity	10		10				10
Dividends paid on subsidiary common stock to noncontrolling interests	(8)							(8)
Reclassifications of Temporary to Permanent Equity	0	0	0		0		0	0
Stockholders' Equity, Other	1	0	1	0	0	0	1	0
Ending balance at Dec. 31, 2019	$ 5,403	$ 969	$ 950	$ 18,906	$ (13,191)	$ (2,350)	$ 5,284	$ 119

Consolidated Statement of Cash

Consolidated Statement of Cash Flows - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net income attributable to the controlling and noncontrolling interests	$ 1,269	$ 1,358	$ 1,615
Income from discontinued operations, net of tax	0	18	225
Income from continuing operations	1,269	1,340	1,390
Adjustments to reconcile net income to cash from operations:
Depreciation and amortization	511	497	460
Pension expense	54	43	65
Pension settlement charge	0	0	60
Business restructuring, net	176	66	0
Environmental remediation charges and other costs, net	61	77	0
Stock-based compensation expense	39	37	35
Gain on sale of land	0	(26)	0
Net gain, from sale of businesses	0	0	(25)
Equity affiliate loss/(income), net of dividends	4	(1)	(4)
Deferred income taxes	(5)	45	38
Cash contributions to pension plans	(13)	(99)	(87)
Restructuring cash expenditures	(58)	(66)	(49)
Change in certain asset and liability accounts (net of acquisitions):
Receivables	121	(69)	(76)
Inventories	145	(109)	(116)
Other current assets	(95)	5	(43)
Accounts payable and accrued liabilities	(63)	(76)	188
Noncurrent assets and liabilities, net	(13)	(207)	(170)
Taxes and interest payable	(32)	50	(129)
Other	(17)	(20)	14
Cash from operating activities - continuing operations	2,084	1,487	1,551
Cash (used for)/from operating activities - discontinued operations	(4)	(20)	17
Cash from operating activities	2,080	1,467	1,568
Investing activities
Additions to property and investments	(413)	(411)	(360)
Business acquisitions, net of cash balances acquired (See Note 2)	(643)	(378)	(225)
Payments for acquisition of equity investment	0	0	(100)
Net proceeds from the sale of businesses	0	0	593
Proceeds from sale of land	0	27	0
Payments for the settlement of cross currency swap contracts	(8)	(28)	(34)
Proceeds from the settlement of cross currency swap contracts	28	23	37
Other	27	3	26
Cash used for investing activities - continuing operations	(1,009)	(764)	(63)
Cash used for investing activities - discontinued operations	0	0	(4)
Cash used for investing activities	(1,009)	(764)	(67)
Financing activities
Net change in borrowings with maturities of three months or less	6	(1)	(7)
Net proceeds/(payments) on commercial paper and short-term debt	100	(2)	(93)
Proceeds from long term debt (net of discount and issuance costs) (See Note 8)	595	992	0
Repayment of long-term debt (See Note 8)	(637)	(6)	(588)
Repayments of acquired debt	(23)	0	0
Payments related to tax withholding on stock-based compensation awards	(20)	(15)	(28)
Purchase of treasury stock	(325)	(1,721)	(813)
Issuance of treasury stock	61	15	52
Dividends paid on PPG common stock	(468)	(453)	(434)
Payments to noncontrolling interests	(39)	0	0
Other	(8)	(14)	(43)
Cash used for financing activities	(758)	(1,205)	(1,954)
Effect of currency exchange rate changes on cash and cash equivalents	1	(32)	69
Net increase/(decrease) in cash and cash equivalents	314	(534)	(384)
Cash and cash equivalents, beginning of year	902	1,436	1,820
Cash and cash equivalents, end of year	1,216	902	1,436
Supplemental disclosures of cash flow information:
Interest paid, net of amount capitalized	127	108	100
Taxes paid, net of refunds	$ 348	$ 380	$ 648
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued	164	0	0

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	Leases PPG leases certain retail paint stores, warehouses, distribution facilities, office space, fleet vehicles and equipment. The components of lease expense for the year ended December 31, 2019 were as follows: ($ in millions) Classification in the Consolidated Statement of Income 2019 Operating lease cost Cost of sales, exclusive of depreciation and amortization $34 Operating lease cost Selling, general and administrative 198 Total operating lease cost $232 Finance lease cost: Amortization of right-of-use assets Depreciation $2 Interest on lease liabilities Interest expense 1 Total finance lease cost $3 Total lease cost $235 Lease expense for operating leases was $289 million and $288 million in 2018 and 2017, respectively. Total operating lease cost for the year ended December 31, 2019 is inclusive of the following: ($ in millions) 2019 Variable lease costs $15 Short-term lease costs $5 ($ in millions) Classification on the Consolidated Balance Sheet 2019 Assets: Operating Operating lease right-of-use assets $782 Finance (a) Property, plant, and equipment, net 17 Total leased assets $799 Liabilities: Current Operating Current portion of operating lease liabilities $170 Finance Short-term debt and current portion of long-term debt 3 Noncurrent Operating Operating lease liabilities $622 Finance Long-term debt 8 Total lease liabilities $803 (a) Net of accumulated depreciation of $11 million . ($ in millions) 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows paid for operating leases $210 Operating cash flows paid for finance leases $1 Financing cash flows paid for finance leases $4 Right-of-use assets obtained in exchange for lease obligations: Operating leases $219 Finance leases $1 2019 Weighted-average remaining lease term (in years) Operating leases 7.4 Finance leases 6.2 Weighted-average discount rate Operating leases 3.0 % Finance leases 9.4 % As of December 31, 2019 , maturities of lease liabilities were as follows: ($ in millions) Operating Leases Finance Leases 2020 $191 $3 2021 150 2 2022 118 2 2023 92 2 2024 72 1 Thereafter 266 3 Total lease payments $889 $13 Less: Interest 97 2 Total lease obligations $792 $11 Disclosures related to periods prior to adoption of ASU 2016-02 PPG adopted ASU 2016-02 using a retrospective adoption method at January 1, 2019 as noted in Note 1 , " Summary of Significant Accounting Policies ." As required, the following disclosure is provided for periods prior to adoption. Minimum lease commitments as of December 31, 2018 that have initial or remaining lease terms in excess of one year are as follows: ($ in millions) Operating Leases Capital Leases 2019 $207 $3 2020 $157 $3 2021 $116 $1 2022 $93 $1 2023 $76 $1 Beyond 2023 $244 $3

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Principles of Consolidation The accompanying consolidated financial statements include the accounts of PPG Industries, Inc. (“PPG” or the “Company”) and all subsidiaries, both U.S. and non-U.S., that it controls. PPG owns more than 50% of the voting stock of most of the subsidiaries that it controls. For those consolidated subsidiaries in which the Company’s ownership is less than 100% , the outside shareholders’ interests are shown as noncontrolling interests. Investments in companies in which PPG owns 20% to 50% of the voting stock and has the ability to exercise significant influence over operating and financial policies of the investee are accounted for using the equity method of accounting. As a result, PPG’s share of income or losses from such equity affiliates is included in the consolidated statement of income and PPG’s share of these companies’ shareholders’ equity is included in Investments on the consolidated balance sheet. Transactions between PPG and its subsidiaries are eliminated in consolidation. Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of income and expenses during the reporting period. Such estimates also include the fair value of assets acquired and liabilities assumed resulting from the allocation of the purchase price related to business combinations consummated. Actual outcomes could differ from those estimates. Revenue Recognition Revenue is recognized as performance obligations with the customer are satisfied, at an amount that is determined to be collectible. For the sale of products, this generally occurs at the point in time when control of the Company’s products transfers to the customer based on the agreed upon shipping terms. Shipping and Handling Costs Amounts billed to customers for shipping and handling are reported in Net sales in the consolidated statement of income. Shipping and handling costs incurred by the Company for the delivery of goods to customers are included in Cost of sales, exclusive of depreciation and amortization in the consolidated statement of income. Selling, General and Administrative Costs Amounts presented in Selling, general and administrative in the consolidated statement of income are comprised of selling, customer service, distribution and advertising costs, as well as the costs of providing corporate-wide functional support in such areas as finance, law, human resources and planning. Distribution costs pertain to the movement and storage of finished goods inventory at company-owned and leased warehouses and other distribution facilities. Advertising Costs Advertising costs are charged to expense as incurred and totaled $283 million , $ 280 million and $ 313 million in 2019 , 2018 and 2017 , respectively. Research and Development Research and development costs, which consist primarily of employee related costs, are charged to expense as incurred. ($ in millions) 2019 2018 2017 Research and development – total $456 $464 $472 Less depreciation on research facilities 24 23 21 Research and development, net $432 $441 $451 Legal Costs Legal costs, which primarily include costs associated with acquisition and divestiture transactions, general litigation, environmental regulation compliance, patent and trademark protection and other general corporate purposes, are charged to expense as incurred. Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to operating losses and tax credit carryforwards as well as differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in Income tax expense in the consolidated statement of income in the period that includes the enactment date. A valuation allowance will be provided against deferred tax assets if PPG determines it is more likely than not such assets will not ultimately be realized. PPG does not recognize a tax benefit unless it concludes that it is more likely than not that the benefit will be sustained on audit by the taxing authority based solely on the technical merits of the associated tax position. If the recognition threshold is met, PPG recognizes a tax benefit measured at the largest amount of the tax benefit that, in PPG’s judgment, is greater than 50 percent likely to be realized. PPG records interest and penalties related to uncertain tax positions in Income tax expense in the consolidated statement of income. Foreign Currency Translation The functional currency of most significant non-U.S. operations is their local currency. Assets and liabilities of those operations are translated into U.S. dollars using year-end exchange rates; income and expenses are translated using the average exchange rates for the reporting period. Unrealized foreign currency translation gains and losses are deferred in Accumulated other comprehensive loss on the consolidated balance sheet. Cash Equivalents Cash equivalents are highly liquid investments (valued at cost, which approximates fair value) acquired with an original maturity of three months or less. Short-term Investments Short-term investments are highly liquid, high credit quality investments (valued at cost plus accrued interest) that have stated maturities of greater than three months to less than one year. The purchases and sales of these investments are classified as Investing activities in the consolidated statement of cash flows. Marketable Equity Securities The Company’s investment in marketable equity securities is recorded at fair market value and reported as Other current assets and Investments on the consolidated balance sheet with changes in fair market value recorded in income. Inventories Inventories are stated at the lower of cost or net realizable value. Most U.S. inventories are stated at cost, using the last-in, first-out (“LIFO”) method of accounting, which does not exceed net realizable value. All other inventories are stated at cost, using the first-in, first-out (“FIFO”) method of accounting, which does not exceed net realizable value. PPG determines cost using either average or standard factory costs, which approximate actual costs, excluding certain fixed costs such as depreciation and property taxes. See Note 4 , “ Working Capital Detail ” for further information concerning the Company’s inventory. Derivative Financial Instruments The Company recognizes all derivative financial instruments (a “derivative”) as either assets or liabilities at fair value on the consolidated balance sheet. The accounting for changes in the fair value of a derivative depends on the use of the instrument. For derivative instruments that are designated and qualify as cash flow hedges, the unrealized gains or losses on the derivatives are recorded in the consolidated statement of comprehensive income. Amounts in Accumulated other comprehensive loss on the consolidated balance sheet are reclassified into Income before income taxes in the consolidated statement of income in the same period or periods during which the hedged transactions are recorded in Income before income taxes in the consolidated statement of income. For derivative instruments that are designated and qualify as fair value hedges, the change in the fair value of the derivatives are reported in Income before income taxes in the consolidated statement of income, offsetting the gain or loss recognized for the change in fair value of the asset, liability, or firm commitment that is being hedged. For derivatives, debt or other financial instruments that are designated and qualify as net investment hedges, the gains or losses associated with the financial instruments are reported as translation gains or losses in Accumulated other comprehensive loss on the consolidated balance sheet. Gains and losses in Accumulated other comprehensive loss related to hedges of the Company’s net investments in foreign operations are reclassified out of Accumulated other comprehensive loss and recognized in Income before income taxes in the consolidated statement of income upon a substantial liquidation, sale or partial sale of such investments or upon impairment of all or a portion of such investments. The cash flow impact of these instruments are classified as Investing activities in the consolidated statement of cash flows. Changes in the fair value of derivative instruments not designated as hedges for hedge accounting purposes are recognized in Income before income taxes in the consolidated statement of income in the period of change. Property, Plant and Equipment Property, plant and equipment is recorded at cost. Depreciation is computed on a straight-line method based on the estimated useful lives of related assets. Additional depreciation expense is recorded when facilities or equipment are subject to abnormal economic conditions, restructuring actions or obsolescence. The cost of significant improvements that add to productive capacity or extend the lives of properties are capitalized. Costs for repairs and maintenance are charged to expense as incurred. When a capitalized asset is retired or otherwise disposed of, the original cost and related accumulated depreciation balance are removed from the accounts and any related gain or loss is recorded in Income before income taxes in the consolidated statement of income. The amortization cost of finance lease assets are recorded in Depreciation expense in the consolidated statement of income. Property and other long-lived assets are reviewed for impairment whenever events or circumstances indicate that their carrying amounts may not be recoverable. See Note 5 , “ Property, Plant and Equipment ” for further details. Goodwill and Identifiable Intangible Assets Goodwill represents the excess of the cost over the fair value of acquired identifiable tangible and intangible assets less liabilities assumed from acquired businesses. Identifiable intangible assets acquired in business combinations are recorded based upon their fair value at the date of acquisition. PPG is a multinational manufacturer with 9 operating segments (which the Company refers to as “strategic business units”) that are organized based on the Company’s major products lines. These operating segments are also the Company’s reporting units for purposes of testing goodwill for impairment, which is tested at least annually in connection with PPG’s strategic planning process or more frequently if an indication of impairment exists. The Company tests goodwill for impairment by either performing a qualitative evaluation or a quantitative test. The qualitative evaluation is an assessment of factors, including reporting unit specific operating results as well as industry, market and general economic conditions, to determine whether it is more likely than not that the fair values of a reporting unit is less than its carrying amount, including goodwill. The Company may elect to bypass this qualitative assessment for some or all of its reporting units and perform a quantitative test. Quantitative goodwill impairment testing is performed during the fourth quarter of each year by comparing the estimated fair value of an associated reporting unit as of September 30 to its carrying value. Fair value is estimated using a discounted cash flow model. Key assumptions and estimates used in the discounted cash flow model include projected future revenues, discount rates, operating cash flows, capital expenditures and tax rates. In 2019, the annual impairment testing review of goodwill did not result in impairment of the Company’s reporting units. The Company has determined that certain acquired trademarks have indefinite useful lives. The Company tests the carrying value of these trademarks for impairment at least annually, or as needed whenever events and circumstances indicate that their carrying amount may not be recoverable. The annual assessment takes place in the fourth quarter of each year either by completing a qualitative assessment or quantitatively by comparing the estimated fair value of each trademark as of September 30 to its carrying value. Fair value is estimated by using the relief from royalty method (a discounted cash flow methodology). The qualitative assessment includes consideration of factors, including revenue relative to the asset being assessed, the operating results of the related business as well as industry, market and general economic conditions, to determine whether it is more likely than not that the fair value of the asset is less than its carrying amount. In 2019, the annual impairment testing review of indefinite-lived intangibles did not result in an impairment. Identifiable intangible assets with finite lives are amortized on a straight-line basis over their estimated useful lives ( 1 to 30 years) and are reviewed for impairment whenever events or circumstances indicate that their carrying amount may not be recoverable. Receivables and Allowances All trade receivables are reported on the consolidated balance sheet at the outstanding principal adjusted for any allowance for credit losses and any charge offs. The Company provides an allowance for doubtful accounts to reduce receivables to their estimated net realizable value when it is probable that a loss will be incurred. Those estimates are based on historical collection experience, current economic and market conditions, a review of the aging of accounts receivable and the assessments of current creditworthiness of customers. Leases The Company determines if a contract is a lease at the inception of the arrangement. The Company reviews all options to extend, terminate, or purchase its right of use assets at the inception of the lease and accounts for these options when they are reasonably certain of being exercised. Certain real estate leases contain lease and non-lease components, which are accounted for separately. For certain equipment leases, lease and non-lease components are accounted for as a single lease component. Leases with an initial term of twelve months or less are not recorded on the consolidated balance sheet. Lease expense for these leases is recognized on a straight-line basis over the lease term. Variable lease expense is based on contractual arrangements with PPG’s lessors determined based on external indices or other relevant market factors. In addition, PPG’s variable lease expense also includes elements of a contract that do not represent a good or service but for which the lessee is responsible for paying. Nearly all of PPG’s lease contracts do not provide a readily determinable implicit rate. For these contracts, PPG’s estimated incremental borrowing rate is based on information available at the inception of the lease. Product warranties The Company accrues for product warranties at the time the associated products are sold based on historical claims experience. The reserve, pretax charges against income and cash outlays for product warranties were not significant to the consolidated financial statements of the Company for any year presented. Asset Retirement Obligations An asset retirement obligation represents a legal obligation associated with the retirement of a tangible long-lived asset that is incurred upon the acquisition, construction, development or normal operation of that long-lived asset. PPG recognizes asset retirement obligations in the period in which they are incurred, if a reasonable estimate of fair value can be made. The asset retirement obligation is subsequently adjusted for changes in fair value. The associated estimated asset retirement costs are capitalized as part of the carrying amount of the long-lived asset and depreciated over its useful life. PPG’s asset retirement obligations are primarily associated with the retirement or closure of certain assets used in PPG’s manufacturing process. The accrued asset retirement obligation is recorded in Accounts payable and accrued liabilities and Other liabilities on the consolidated balance sheet, and was $21 million and $22 million as of December 31, 2019 and 2018 , respectively. PPG’s only conditional asset retirement obligation relates to the possible future abatement of asbestos contained in certain PPG production facilities. The asbestos in PPG’s production facilities arises from the application of normal and customary building practices in the past when the facilities were constructed. This asbestos is encapsulated in place and, as a result, there is no current legal requirement to abate it. Because there is no requirement to abate, the Company does not have any current plans or an intention to abate and therefore the timing, method and cost of future abatement, if any, are not known. The Company has not recorded an asset retirement obligation associated with asbestos abatement, given the uncertainty concerning the timing of future abatement, if any. Accounting Standards Adopted in 2019 Effective January 1, 2019, PPG adopted Accounting Standards Update (“ASU”) No. 2016-02, "Leases." This ASU requires substantially all leases be recorded on the balance sheet as right of use assets and lease obligations. PPG adopted the ASU using a retrospective adoption method at January 1, 2019, as outlined in ASU No. 2018-11, "Leases - Targeted Improvements." Under this method of adoption, there is no impact to the consolidated statement of income and consolidated balance sheet. PPG determined that there was no cumulative-effect adjustment to beginning Retained earnings on the consolidated balance sheet. PPG will continue to report periods prior to January 1, 2019 in its financial statements under prior guidance as outlined in Accounting Standards Codification Topic 840, "Leases." In addition, PPG elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed carry forward of historical lease classifications. Adoption of this standard did not materially impact PPG’s Income before income taxes and had no impact on the consolidated statement of cash flows. See Note 2, "Leases" for further details. Accounting Standards to be Adopted in Future Years In August 2018, the Financial Accounting Standards Board ("FASB") issued ASU No. 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software." This ASU requires capitalization of certain implementation costs incurred in a cloud computing arrangement that is a service contract. PPG adopted the new standard effective January 1, 2020. PPG is nearly complete in the assessment and implementation of this ASU and does not believe this ASU will have a material impact on its consolidated financial position, results of operations or cash flows. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses.” This ASU requires an organization to measure all expected credit losses for financial assets, including trade receivables, held at the reporting date based on historical experience, current conditions, and reasonable and supportable information. Financial institutions and other organizations will now use forward-looking information to better estimate their credit losses. PPG adopted the new standard effective January 1, 2020. PPG is nearly complete in its assessment of this ASU and has updated its internal controls and operational processes and procedures to include certain forward looking considerations in its current process of developing and recognizing credit losses for its financial assets accounted for at amortized cost. PPG is nearly complete in the assessment and implementation of this ASU and does not believe this ASU will have a material impact on its consolidated financial position, results of operations or cash flows.

Acquisitions and Dispositions

Acquisitions and Dispositions	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Acquisitions and Dispositions	Acquisitions and Divestitures Acquisitions Announced Acquisition: Alpha Coating Technologies, LLC In February 2020, PPG announced that it will acquire Alpha Coating Technologies, LLC, a manufacturer of powder coatings for light industrial applications and heat sensitive substrates. The transaction is expected to close in the first quarter of 2020. Completed Acquisitions Industria Chimica Reggiana On January 31, 2020, PPG completed the acquisition of Industria Chimica Reggiana S.p.A, an Italian manufacturer of automotive refinish products. The pro-forma impact on PPG's sales and results of operations, including the pro-forma effect of events that are directly attributable to the acquisition, was not significant. The results of this business since the date of acquisition have been reported within the automotive refinish coatings business within the Performance Coatings reportable business segment. Texstars, LLC On October 25, 2019, PPG completed the acquisition of Texstars, LLC, a manufacturer of high-performance transparencies, wingtip lenses and plastic components for aerospace and defense vehicles and a leader in advanced transparent coatings. The pro-forma impact on PPG's sales and results of operations, including the pro-forma effect of events that are directly attributable to the acquisition, was not significant. The results of this business since the date of acquisition have been reported within the aerospace coatings business within the Performance Coatings reportable business segment. Dexmet Corporation On August 14, 2019, PPG completed the acquisition of Dexmet Corporation, a specialty materials manufacturer. Dexmet Corporation specializes in customized, highly-engineered, expanded and perforated metal foils and polymers used for structural applications. The pro-forma impact on PPG's sales and results of operations, including the pro-forma effect of events that are directly attributable to the acquisition, was not significant. The results of this business since the date of acquisition have been reported within the aerospace coatings business within the Performance Coatings reportable business segment. Hemmelrath On April 16, 2019, PPG completed the acquisition of Hemmelrath, an automotive coatings manufacturer. Hemmelrath is a global manufacturer of coatings for automotive original equipment manufacturers ("OEMs"). The pro-forma impact on PPG's sales and results of operations, including the pro-forma effect of events that are directly attributable to the acquisition, was not significant. The results of this business since the date of acquisition have been reported within the automotive OEM coatings business within the Industrial Coatings reportable business segment. Whitford Worldwide Company On March 1, 2019, PPG completed the acquisition of Whitford Worldwide Company ("Whitford"), a global manufacturer that specializes in low-friction and nonstick coatings for industrial applications and consumer products. Whitford operates 10 manufacturing facilities globally. The pro-forma impact on PPG's sales and results of operations, including the pro-forma effect of events that are directly attributable to the acquisition, was not significant. The results of this business since the date of acquisition have been reported within the industrial coatings business within the Industrial Coatings reportable business segment. SEM Products, Inc. In the fourth quarter of 2018, PPG completed the acquisition of SEM Products, Inc., a U.S.-based manufacturer of specialized automotive refinish products (“SEM”). SEM is a leading manufacturer of repair and refinish products used primarily for automotive and other transportation applications. The pro-forma impact on PPG's sales and results of operations, including the pro-forma effect of events that are directly attributable to the acquisition, was not significant. The results of this business since the date of acquisition have been reported within the automotive refinish coatings business within the Performance Coatings reportable business segment. The Crown Group On October 2, 2017, PPG acquired The Crown Group (“Crown”), a U.S.-based coatings application services business. Crown is one of the leading component and product finishers in North America. Crown applies coatings to customers’ manufactured parts and assembled products at several U.S. sites. Most of Crown’s facilities, which also provide assembly, warehousing and sequencing services, are located at customer facilities or positioned near customer manufacturing sites. The company serves manufacturers in the automotive, agriculture, construction, heavy truck and alternative energy industries. The pro-forma impact on PPG's sales and results of operations, including the pro-forma effect of events that are directly attributable to the acquisition, was not significant. The results of this business since the date of acquisition have been reported within the industrial coatings business within the Industrial Coatings reportable business segment. Taiwan Chlorine Industries Taiwan Chlorine Industries (“TCI”) was established in 1986 as a joint venture between PPG and China Petrochemical Development Corporation (“CPDC”) to produce chlorine-based products in Taiwan, at which time PPG owned 60 percent of the venture. In conjunction with the 2013 separation of its commodity chemicals business, PPG conveyed to Axiall Corporation ("Axiall") its 60% ownership interest in TCI. Under PPG’s agreement with CPDC, if certain post-closing conditions were not met following the three year anniversary of the separation, CPDC had the option to sell its 40% ownership interest in TCI to Axiall for $100 million . In turn, Axiall had a right to designate PPG as its designee to purchase the 40% ownership interest of CPDC. In April 2016, Axiall announced that CPDC had decided to sell its ownership interest in TCI to Axiall. In June 2016, Axiall formally designated PPG to purchase the 40% ownership interest in TCI. In August 2016, Westlake Chemical Corporation acquired Axiall, which became a wholly-owned subsidiary of Westlake. In April 2017, PPG finalized its purchase of CPDC’s 40% ownership interest in TCI. The difference between the acquisition date fair value and the purchase price of PPG’s 40% ownership interest in TCI has been recorded as a loss in discontinued operations during the year-ended December 31, 2017. PPG’s ownership in TCI is accounted for as an equity method investment and the related equity earnings are reported within Other income in the consolidated statement of income and in Legacy in Note 21 , “ Reportable Business Segment Information .” Other Acquisitions In 2019 , 2018 , and 2017 , the Company completed several smaller business acquisitions. The total consideration paid for these acquisitions, net of cash acquired, debt assumed and other post closing adjustments, was $9 million , $108 million and $74 million , respectively. In January 2018, PPG acquired ProCoatings, a leading architectural paint and coatings wholesaler located in The Netherlands. ProCoatings, established in 2001, distributes a large portfolio of well-known professional paint brands through its network of 27 multi-brand stores. The results of this business since the date of acquisition have been reported within the architectural coatings - Europe Middle East and Africa (“EMEA”) business within the Performance Coatings reportable business segment. In January 2017, PPG acquired certain assets of automotive refinish coatings company Futian Xinshi (“Futian”), based in the Guangdong province of China. Futian distributes its products in China through a network of more than 200 distributors. In January 2017, PPG completed the acquisition of DEUTEK S.A., a leading Romanian paint and architectural coatings manufacturer, from the Emerging Europe Accession Fund. DEUTEK, established in 1993, manufactures and markets a large portfolio of well-known professional and consumer paint brands, including OSKAR and Danke!. The company’s products are sold in more than 120 do-it-yourself stores and 3,500 independent retail outlets in Romania. Divestitures Glass Segment In 2017, PPG completed a multi-year strategic shift in the Company's business portfolio, resulting in the exit of all glass operations which consisted of the global fiber glass business, PPG's ownership interest in two Asian fiber glass joint ventures and the flat glass business. Accordingly, the results of operations, including the gains on the divestitures, and cash flows have been recast as discontinued operations for all periods presented. PPG now has two reportable business segments. The net sales and income from discontinued operations related to the former Glass segment for the three years ended December 31, 2019 , 2018 , and 2017 were as follows: ($ in millions) 2019 2018 2017 Net sales $— $— $217 Income from operations $3 $21 $30 Net gains on the divestitures of businesses — — 343 Income tax expense 1 5 140 Income from discontinued operations, net of tax $2 $16 $233 During 2018, PPG released $13 million of previously recorded accruals and contingencies established in conjunction with the divestitures of businesses within the former Glass segment as a result of completed actions, new information and updated estimates. Also during 2018, PPG made a final payment of $20 million to Vitro S.A.B. de C.V related to the transfer of certain pension obligations upon the sale of the former flat glass business. North American Fiber Glass Business On September 1, 2017, PPG completed the sale of its North American fiber glass business to Nippon Electric Glass Co. Ltd. (“NEG”). Cash proceeds from the sale were $541 million , resulting in a pretax gain of $343 million , net of certain accruals and contingencies established in conjunction with the divestiture. PPG’s fiber glass operations included manufacturing facilities in Chester, South Carolina, and Lexington and Shelby, North Carolina; and administrative and research-and-development operations in Shelby and in Harmar, Pennsylvania, near Pittsburgh. The business supplies the transportation, energy, infrastructure and consumer markets. Other Divestitures Plaka Business In June 2017, PPG completed the sale of the assets of its Mexico-based Plaka plasterboard and cement-board business to Knauf International GmbH and recorded a $25 million pretax gain on the sale.

Working Capital Detail

Working Capital Detail	12 Months Ended
	Dec. 31, 2019
Disclosure Components Of Working Capital Detail [Abstract]
Working Capital Detail	Working Capital Detail ($ in millions) 2019 2018 Receivables Trade - net (1) $2,479 $2,505 Equity affiliates 3 4 Other - net 274 336 Total $2,756 $2,845 Inventories (2) Finished products $1,047 $1,105 Work in process 197 193 Raw materials 431 452 Supplies 35 33 Total $1,710 $1,783 Accounts payable and accrued liabilities Trade $2,098 $2,177 Accrued payroll 455 424 Customer rebates 280 283 Other postretirement and pension benefits 85 80 Income taxes 46 112 Other 532 547 Total $3,496 $3,623 (1) Allowance for doubtful accounts was $22 million and $24 million as of December 31, 2019 and 2018 , respectively. (2) Inventories valued using the LIFO method of inventory valuation comprised 34% and 36% of total gross inventory values as of December 31, 2019 and 2018 , respectively. If the FIFO method of inventory valuation had been used, inventories would have been $124 million and $113 million higher as of December 31, 2019 and 2018 , respectively. During the years ended December 31, 2019 and 2018 , certain inventories accounted for on the LIFO method of accounting were reduced, which resulted in the liquidation of certain quantities carried at costs prevailing in prior years. The effect on Income before income taxes was income of $1 million and $2 million for the years ended December 31, 2019 and 2018 , respectively.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment ($ in millions) Useful Lives (years) 2019 2018 Land and land improvements 1-30 $511 $489 Buildings 20-40 1,573 1,472 Machinery and equipment 5-25 3,575 3,387 Other 3-20 1,092 989 Construction in progress 314 296 Total (1) $7,065 $6,633 Less: accumulated depreciation 4,082 3,828 Net $2,983 $2,805 (1) Interest capitalized in 2019 , 2018 and 2017 was $6 million , $4 million and $7 million , respectively.

Investments

Investments	12 Months Ended
	Dec. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Investments	Investments ($ in millions) 2019 2018 Investments in equity affiliates $129 $132 Marketable equity securities (See Note 10) 80 69 Other 49 50 Total $258 $251 Investments in equity affiliates represent PPG’s ownership interests in entities between 20% and 50% that manufacture and sell coatings and certain chemicals. In 2017, PPG purchased a 40% ownership interest in TCI. Refer to Note 3 , “ Acquisitions and Divestitures ” for additional information. PPG’s share of undistributed net earnings of equity affiliates was $11 million as of December 31, 2019 and December 31, 2018 . Dividends received from equity affiliates were $15 million , $15 million and $8 million in 2019 , 2018 and 2017 , respectively.

Goodwill and Other Identifiable

Goodwill and Other Identifiable Intangible Assets	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Identifiable Intangible Assets	Goodwill and Other Identifiable Intangible Assets Goodwill ($ in millions) Performance Coatings Industrial Coatings Total January 1, 2018 $3,104 $838 $3,942 Acquisitions, including purchase accounting adjustments 248 (13 ) 235 Foreign currency impact (86 ) (21 ) (107 ) December 31, 2018 $3,266 $804 $4,070 Acquisitions, including purchase accounting adjustments 166 230 396 Foreign currency impact 10 (6 ) 4 December 31, 2019 $3,442 $1,028 $4,470 Identifiable Intangible Assets December 31, 2019 December 31, 2018 ($ in millions) Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net Indefinite-Lived Identifiable Intangible Assets Trademarks $1,167 $— $1,167 $1,140 $— $1,140 Definite-Lived Identifiable Intangible Assets Acquired technology $710 ($549 ) $161 $648 ($515 ) $133 Customer-related 1,578 (885 ) 693 1,396 (798 ) 598 Trade names 210 (111 ) 99 190 (96 ) 94 Other 51 (40 ) 11 44 (37 ) 7 Total Definite Lived Intangible Assets $2,549 ($1,585 ) $964 $2,278 ($1,446 ) $832 Total Identifiable Intangible Assets $3,716 ($1,585 ) $2,131 $3,418 ($1,446 ) $1,972 The Company’s identifiable intangible assets with definite lives are being amortized over their estimated useful lives. Aggregate amortization expense was $136 million , $143 million and $129 million in 2019 , 2018 and 2017 , respectively. ($ in millions) 2020 2021 2022 2023 2024 Estimated future amortization expense $135 $120 $115 $105 $85

Business Restructuring

Business Restructuring	12 Months Ended
	Dec. 31, 2019
Restructuring and Related Activities [Abstract]
Business Restructuring	Business Restructuring The Company records restructuring liabilities that represent charges incurred in connection with consolidations of certain operations, including operations from acquisitions, as well as headcount reduction programs. These charges consist primarily of severance and other cash costs. As a result of these programs, the Company will also incur incremental non-cash accelerated depreciation expense for certain assets due to their reduced expected asset life. These charges are not allocated to the Company’s reportable business segments. Refer to Note 21 , “ Reportable Business Segment Information ” for additional information. 2019 Restructuring Program In June 2019, the Company approved a business restructuring plan which included actions to reduce its global cost structure. The program is the result of a comprehensive internal operational assessment to identify further opportunities to improve the profitability of the overall business portfolio. This program includes further manufacturing optimization; targeted pruning of low-profit business in certain regions; exiting certain smaller product lines that are not meeting profitability objectives; reorganization of certain business unit cost structures based on the current economic climate; and certain redundancy actions related to recent acquisitions. A pretax restructuring charge of $184 million was recorded in PPG's second quarter 2019 financial results. In the third quarter of 2019, additional programs were approved by management and charges of $10 million were recorded in PPG's financial results. These charges represent employee severance and certain other cash costs. The majority of restructuring actions are expected to be completed by the end of the fourth quarter 2020 with the remainder of the actions expected to be completed in 2022. 2018 Restructuring Program In April 2018, the Company approved a business restructuring plan which included actions to reduce its global cost structure. The program was in response to the impacts of customer assortment changes in our U.S. architectural coatings business during the first quarter 2018 and sustained, elevated raw material inflation. The program aims to further right-size employee headcount and production capacity in certain businesses based on product demand, as well as reductions in various global functional and administrative costs. A pretax restructuring charge of $83 million was recorded in PPG's second quarter 2018 financial results, of which $80 million represented employee severance and other cash costs. The majority of restructuring actions are expected to be completed by the end of the second quarter of 2020. Other Adjustments In 2019 and 2018, adjustments were recorded to reduce the remaining restructuring reserves established under previously approved programs to reflect the current estimate of the costs to complete these actions of approximately $18 million and $49 million , respectively. These amounts are recorded in Business restructuring, net in the consolidated statement of income. The reserve activity for the years ended December 31, 2019 and 2018 , was as follows: Restructuring Reserve Activity ($ in millions) Total Reserve December 31, 2017 $102 Total 2018 restructuring charge 83 Additional actions approved 32 Release of prior reserves and other adjustments (49 ) Cash payments (66 ) Foreign currency impact (4 ) Other 12 December 31, 2018 $110 2019 restructuring charges 194 Release of prior reserves and other adjustments (18 ) Cash payments (58 ) Foreign currency impact (4 ) December 31, 2019 $224

Borrowings and Lines of Credit

Borrowings and Lines of Credit	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Borrowings and Lines of Credit	Borrowings and Lines of Credit Long-term Debt Obligations ($ in millions) Maturity Date 2019 2018 0.00% note (€300) 2019 $— $343 2.3% notes 2019 — 299 3.6% notes 2020 499 498 9% non-callable debentures (1) 2021 134 133 0.875% notes (€600) 2022 671 685 3.2% notes ($300) (2) 2023 298 298 2.4% notes ($300) 2024 297 — 0.875% note (€600) 2025 665 679 1.4% notes (€600) 2027 665 679 3.75% notes ($700) (3) 2028 695 694 2.5% note (€80) 2029 88 91 2.8% notes ($300) 2029 297 — 7.70% notes 2038 174 174 5.5% notes 2040 247 247 3% note (€120) 2044 127 131 Commercial paper Various 100 — Various other non-U.S. debt (4) Various 38 39 Finance lease obligations Various 11 12 Impact of derivatives on debt (1)(5) N/A 36 10 Total $5,042 $5,012 Less payments due within one year N/A 503 647 Long-term debt $4,539 $4,365 (1) PPG entered into several interest rate swaps, which were subsequently settled in prior periods. The impact of these settlements are being amortized over the remaining life of the debentures as a reduction to interest expense. The weighted average interest rate for these borrowings was 8.4% for the years ended December 31, 2019 and 2018 . (2) In February 2018, PPG entered into interest rate swaps which converted $150 million of the notes from a fixed interest rate to a floating interest rate based on the three month London Interbank Offered Rate (LIBOR). The impact of the derivative on the notes represents the fair value adjustment of the debt. The average effective interest rate for the portion of the notes impacted by the swaps was 2.9% and 2.7% as of December 31, 2019 and 2018 , respectively. Refer to Note 10 , “ Financial Instruments, Hedging Activities and Fair Value Measurements ” for additional information. (3) In February 2018, PPG entered into interest rate swaps which converted $375 million of the notes from a fixed interest rate to a floating interest rate based on the three month LIBOR. The impact of the derivative on the notes represents the fair value adjustment of the debt. The average effective interest rate for the portion of the notes impacted by the swaps was 3.3% and 3.2% as of December 31, 2019 and 2018 , respectively. Refer to Note 10 , “ Financial Instruments, Hedging Activities and Fair Value Measurements ” for additional information. (4) Weighted average interest rate of 3.7% and 3.8% as of December 31, 2019 and 2018 , respectively. (5) Fair value adjustment of the 3.2% $300 million notes and 3.75% $700 million notes as a result of fair value hedge accounting treatment related to the outstanding interest rate swaps as of December 31, 2019 and 2018 , respectively. Refer to Note 10 , “ Financial Instruments, Hedging Activities and Fair Value Measurements ” for additional information. 2019 Activities In August 2019, PPG completed a public offering of $300 million aggregate principal amount of 2.4% notes due 2024 and $300 million aggregate principal amount of 2.8% notes due 2029. These notes were issued pursuant to PPG’s existing shelf registration statement and pursuant to an indenture between the Company and The Bank of New York Mellon Trust Company, N.A., as trustee, as supplemented (the "2019 Indenture"). The 2019 Indenture governing these notes contains covenants that limit the Company’s ability to, among other things, incur certain liens securing indebtedness, engage in certain sale-leaseback transactions, and enter into certain consolidations, mergers, conveyances, transfers or leases of all or substantially all the Company’s assets. The terms of these notes also require the Company to make an offer to repurchase the notes upon a Change of Control Triggering Event (as defined in the 2019 Indenture) at a price equal to 101% of their principal amount plus accrued and unpaid interest. The Company may issue additional debt from time to time pursuant to the 2019 Indenture. The aggregate cash proceeds from the notes, net of discounts and fees, was $595 million . In November 2019, PPG’s €300 million 0.00% notes and $300 million 2.3% notes matured, upon which the Company paid $634 million to settle these obligations. 2018 Activities In February 2018, PPG completed a public offering of $300 million aggregate principal amount of 3.2% notes due 2023 and $700 million aggregate principal amount of 3.75% notes due 2028. These notes were issued pursuant to PPG’s existing shelf registration statement and pursuant to an indenture between the Company and The Bank of New York Mellon Trust Company, N.A., as trustee, as supplemented (the "2018 Indenture"). The 2018 Indenture governing these notes contains covenants that limit the Company’s ability to, among other things, incur certain liens securing indebtedness, engage in certain sale-leaseback transactions, and enter into certain consolidations, mergers, conveyances, transfers or leases of all or substantially all the Company’s assets. The terms of these notes also require the Company to make an offer to repurchase the notes upon a Change of Control Triggering Event (as defined in the 2018 Indenture) at a price equal to 101% of their principal amount plus accrued and unpaid interest. The Company may issue additional debt from time to time pursuant to the 2018 Indenture. The aggregate cash proceeds from the notes, net of discounts and fees, was $992 million . A portion of the notes were converted from a fixed interest rate to a floating interest rate using interest rate swap contracts. For more information, refer to Note 10 , “ Financial Instruments, Hedging Activities and Fair Value Measurements .” 2017 Activities In November 2017, PPG’s €500 million 3-year variable rate bank loan matured and the Company repaid this obligation using $587 million of cash on hand. Credit agreements In August 2019, PPG amended and restated its five-year credit agreement (the “Credit Agreement”) with several banks and financial institutions. The Credit Agreement amends and restates the Company's existing five year credit agreement dated as of December 18, 2015. The Credit Agreement provides for a $2.2 billion unsecured revolving credit facility. The Company has the ability to increase the size of the Credit Agreement by up to an additional $750 million , subject to the receipt of lender commitments and other conditions precedent. The Credit Agreement will terminate on August 30, 2024. The Company has the right, subject to certain conditions set forth in the Credit Agreement, to designate certain subsidiaries of the Company as borrowers under the Credit Agreement. In connection with any such designation, the Company is required to guarantee the obligations of any such subsidiaries under the Credit Agreement. For the years ended December 31, 2019 and 2018 , there were no amounts outstanding under the existing or prior credit agreement. The indicative borrowing rate on a one month, U.S. dollar denominated borrowing was 2.8% at December 31, 2019 . Borrowings under the Credit Agreement may be made in U.S. Dollars or in euros. The Credit Agreement provides that loans will bear interest at rates based, at the Company’s option, on one of two specified base rates plus a margin based on certain formulas defined in the Credit Agreement. Additionally, the Credit Agreement contains a Commitment Fee, as defined in the Credit Agreement, on the amount of unused commitments under the Credit Agreement ranging from 0.060% to 0.125% per annum. The Credit Agreement also supports the Company’s commercial paper borrowings which are classified as long-term based on PPG’s intent and ability to refinance these borrowings on a long-term basis. Commercial paper borrowings of $100 million were outstanding as of December 31, 2019 . There were no commercial paper borrowings outstanding as of December 31, 2018 under the prior credit agreement. The Credit Agreement contains usual and customary restrictive covenants for facilities of its type, which include, with specified exceptions, limitations on the Company’s ability to create liens or other encumbrances, to enter into sale and leaseback transactions and to enter into consolidations, mergers or transfers of all or substantially all of its assets. The Credit Agreement also requires the Company to maintain a ratio of Total Indebtedness to Total Capitalization, as defined in the Credit Agreement, of 60% or less; provided, that for any fiscal quarter in which the Company has made an acquisition for consideration in excess of $1 billion and for the next five fiscal quarters thereafter, the ratio of Total Indebtedness to Total Capitalization may not exceed 65% at any time. As of December 31, 2019 , Total Indebtedness to Total Capitalization as defined under the Credit Agreement was 46%. The Credit Agreement contains, among other things, customary events of default that would permit the lenders to accelerate the loans, including the failure to make timely payments when due under the Credit Agreement or other material indebtedness, the failure to satisfy covenants contained in the Credit Agreement, a change in control of the Company and specified events of bankruptcy and insolvency. Restrictive Covenants and Cross-Default Provisions As of December 31, 2019 , PPG was in full compliance with the restrictive covenants under its various credit agreements, loan agreements and indentures. Additionally, the Company’s Credit Agreement contains customary cross-default provisions. These provisions provide that a default on a debt service payment of $50 million or more for longer than the grace period provided under another agreement may result in an event of default under this agreement. The Company’s 9% non-callable debentures also contain a customary cross default provision triggered by the Company’s default on a debt service payment of $10 million or more. None of the Company’s primary debt obligations are secured or guaranteed by the Company’s affiliates. Long-term Debt Maturities ($ in millions) Maturity per year 2020 $503 2021 $166 2022 $669 2023 $302 2024 $396 Thereafter $3,006 Short-term Debt Obligations ($ in millions) 2019 2018 Various, weighted average 3.6% and 3.4% as of December 31, 2019 and 2018, respectively. $10 $4 Lines of Credit, Letters of Credit, Surety Bonds and Guarantees PPG’s non-U.S. operations have uncommitted lines of credit totaling $396 million of which $2 million was used as of December 31, 2019 . These uncommitted lines of credit are subject to cancellation at any time and are generally not subject to any commitment fees. The Company had outstanding letters of credit and surety bonds of $152 million and $158 million as of December 31, 2019 and 2018 , respectively. The letters of credit secure the Company’s performance to third parties under certain self-insurance programs and other commitments made in the ordinary course of business. As of December 31, 2019 and 2018 , guarantees outstanding were $9 million and $14 million , respectively. The guarantees relate primarily to debt of certain entities in which PPG has an ownership interest and selected customers of certain PPG businesses. A portion of such debt is secured by the assets of the related entities. The carrying value of these guarantees were zero at December 31, 2019 and 2018 , and the fair values of these guarantees were zero and $1 million at December 31, 2019 and 2018 , respectively. The fair value of each guarantee was estimated by comparing the net present value of two hypothetical cash flow streams, one based on PPG’s incremental borrowing rate and the other based on the borrower’s incremental borrowing rate, as of the effective date of the guarantee. Both streams were discounted at a risk free rate of return. The Company does not believe any loss related to these letters of credit, surety bonds or guarantees is likely.

Financial Instruments, Hedging

Financial Instruments, Hedging Activities and Fair Value Measurements	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments, Hedging Activities and Fair Value Measurements	Financial Instruments, Hedging Activities and Fair Value Measurements Financial instruments include cash and cash equivalents, short-term investments, cash held in escrow, marketable equity securities, accounts receivable, company-owned life insurance, accounts payable, short-term and long-term debt instruments, and derivatives. The fair values of these financial instruments approximated their carrying values at December 31, 2019 and 2018 , in the aggregate, except for long-term debt instruments. Hedging Activities The Company has exposure to market risk from changes in foreign currency exchange rates and interest rates. As a result, financial instruments, including derivatives, have been used to hedge a portion of these underlying economic exposures. Certain of these instruments qualify as fair value, cash flow, and net investment hedges upon meeting the requisite criteria, including effectiveness of offsetting hedged or underlying exposures. Changes in the fair value of derivatives that do not qualify for hedge accounting are recognized in Income before income taxes in the period incurred. PPG’s policies do not permit speculative use of derivative financial instruments. PPG enters into derivative financial instruments with high credit quality counterparties and diversifies its positions among such counterparties in order to reduce its exposure to credit losses. The Company did not realize a credit loss on derivatives during the three-year period ended December 31, 2019 . All of PPG’s outstanding derivative instruments are subject to accelerated settlement in the event of PPG’s failure to meet its debt or payment obligations under the terms of the instruments’ contractual provisions. In addition, if the Company would be acquired and its payment obligations under its derivative instruments’ contractual arrangements are not assumed by the acquirer, or if PPG would enter into bankruptcy, receivership or reorganization proceedings, its outstanding derivative instruments would also be subject to accelerated settlement. In 2019 and 2018 , there were no derivative instruments de-designated or discontinued as a hedging instrument. There were no gains or losses deferred in Accumulated other comprehensive loss on the consolidated balance sheet that were reclassified to Income before income taxes in the consolidated statement of income during the three-year period ended December 31, 2019 related to hedges of anticipated transactions that were no longer expected to occur. Fair Value Hedges The Company uses interest rate swaps from time to time to manage its exposure to changing interest rates. When outstanding, the interest rate swaps are typically designated as fair value hedges of certain outstanding debt obligations of the Company and are recorded at fair value. In February 2018, PPG entered into interest rate swaps which converted $525 million of fixed rate debt to variable rate debt. The swaps are designated as fair value hedges and are carried at fair value. Changes in the fair value of these swaps and changes in the fair value of the related debt are recorded in Interest expense in the accompanying consolidated statement of income. The fair value of these interest rate swaps was $35 million and $8 million at December 31, 2019 and 2018 , respectively. Cash Flow Hedges PPG designates certain foreign currency forward contracts as cash flow hedges of the Company’s exposure to variability in exchange rates on third party transactions denominated in foreign currencies. Underlying notional amounts related to these foreign currency forward contracts were $43 million and $50 million at December 31, 2019 and 2018 , respectively. As of December 31, 2019 and 2018 , the fair value of all foreign currency forward contracts designated as cash flow hedges was a liability of $1 million for both periods. Net Investment Hedges PPG uses cross currency swaps and foreign currency euro-denominated debt to hedge a significant portion of its net investment in its European operations, as follows: In August 2019, PPG entered into U.S. dollar to euro cross currency swap contracts with a total notional amount of $300 million and designated these contracts as hedges of the Company’s net investment in its European operations. During the term of these contracts, PPG will receive payments in U.S. dollars and make payments in euros to the counterparties. In February 2018, PPG entered into U.S. dollar to euro cross currency swap contracts with a total notional amount of $575 million and designated these contracts as hedges of the Company's net investment in its European operations. During the term of these contracts, PPG will receive payments in U.S. dollars and make payments in euros to the counterparties. Also in February 2018, the Company settled outstanding U.S. dollar to euro cross currency swap contracts with a total notional amount of $560 million . As of December 31, 2019 and 2018 , the fair value of the 2019 and 2018 U.S. dollar to euro cross currency swap contracts was a net asset of $48 million and an asset of $35 million , respectively. At December 31, 2019 and 2018 , PPG had designated €2.0 billion and €2.3 billion , respectively, of euro-denominated borrowings as hedges of a portion of its net investment in the Company’s European operations. The carrying value of these instruments at December 31, 2019 and 2018 was $2.2 billion and $2.6 billion , respectively. During 2017, PPG used foreign currency forward contracts to hedge a portion of its net investment in its European operations. Changes in the fair value of these derivative instruments were recorded in Accumulated other comprehensive loss on the consolidated balance sheet as gains or losses. The Company paid $3 million to settle a foreign currency forward contract in 2017. There were no foreign currency forward contracts designated as net investment hedges used or outstanding as of and for the periods ended December 31, 2019 , 2018 and 2017 . Other Financial Instruments PPG uses foreign currency forward contracts to manage net transaction exposures that do not qualify for hedge accounting; therefore, the change in the fair value of these instruments is recorded in Other charges in the consolidated statement of income in the period of change. Underlying notional amounts related to these foreign currency forward contracts were $2.8 billion and $2.5 billion at December 31, 2019 and 2018 , respectively. As of December 31, 2019 and 2018 , the fair values of these contracts were a net liability of $6 million and a net asset of $36 million , respectively. Gains/Losses Deferred in Accumulated Other Comprehensive Loss As of December 31, 2019 and 2018 , the Company had accumulated pretax unrealized translation gains in Accumulated other comprehensive loss on the consolidated balance sheet related to the euro-denominated borrowings, foreign currency forward contracts, and the cross currency swaps of $235 million and $161 million , respectively. The following table summarizes the location within the consolidated financial statements and amount of gains/(losses) related to derivative and debt financial instruments for the years ended December 31, 2019 , 2018 and 2017 . All dollar amounts are shown on a pretax basis. 2019 2018 2017 Caption in Consolidated Statement of Income ($ in millions) Gain Deferred in AOCL Gain/(Loss) Recognized (Loss)/Gain Deferred in AOCL Gain/(Loss) Recognized Loss Deferred in AOCL Gain Recognized Fair Value Interest rate Swaps $3 $3 $— Interest expense Total Fair Value $3 $3 $— Cash Flow Foreign currency forward contracts $2 ($3 ) ($9 ) ($8 ) ($7 ) $9 Other charges and Cost of sales Total Cash Flow $2 ($3 ) ($9 ) ($8 ) ($7 ) $9 Net Investment Cross currency swaps $13 $18 $21 $13 ($61 ) $— Interest expense Foreign denominated debt 61 — 124 — (403 ) — Total Net Investment $74 $18 $145 $13 ($464 ) $— Economic Foreign currency forward contracts $55 $55 $14 Other charges Fair Value Measurements The Company follows a fair value measurement hierarchy to measure its assets and liabilities. As of December 31, 2019 and 2018 , respectively, the assets and liabilities measured at fair value on a recurring basis were cash equivalents, equity securities and derivatives. In addition, the Company measures its pension plan assets at fair value (see Note 13 , “ Employee Benefit Plans ” for further details). The Company’s financial assets and liabilities are measured using inputs from the following three levels: Level 1 inputs are quoted prices in active markets for identical assets and liabilities that the Company has the ability to access at the measurement date. Level 1 inputs are considered to be the most reliable evidence of fair value as they are based on unadjusted quoted market prices from various financial information service providers and securities exchanges. Level 2 inputs are directly or indirectly observable prices that are not quoted on active exchanges, which include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means. The fair values of the derivative instruments reflect the instruments’ contractual terms, including the period to maturity, and uses observable market-based inputs, including forward curves. Level 3 inputs are unobservable inputs employed for measuring the fair value of assets or liabilities. The Company does not have any recurring financial assets or liabilities that are recorded in its consolidated balance sheets as of December 31, 2019 and 2018 that are classified as Level 3 inputs. Assets and liabilities reported at fair value on a recurring basis December 31, 2019 December 31, 2018 ($ in millions) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Assets: Other current assets: Marketable equity securities $5 $— $— $4 $— $— Foreign currency forward contracts (a) — 14 — — 45 — Other assets: Cross currency swaps (b) $— $52 $— $— $35 $— Interest rate swaps (c) — 35 — — 8 — Investments: Marketable equity securities $80 $— $— $69 $— $— Liabilities: Accounts payable and accrued liabilities: Foreign currency forward contracts (d) $— $1 $— $— $1 $— Foreign currency forward contracts (a) — 20 — — 9 — Other liabilities: Cross currency swap (b) $— $4 $— $— $— $— (a) Derivatives not designated as hedging instruments (b) Net investment hedges (c) Fair value hedges (d) Cash flow hedges Long-Term Debt ($ in millions) December 31, 2019 (a) December 31, 2018 (b) Long-term debt - carrying value $5,031 $5,000 Long-term debt - fair value $5,363 $5,101 (a) Excluding finance lease obligations of $11 million and short term borrowings of $10 million as of December 31, 2019 . (b) Excluding capital lease obligations of $12 million and short term borrowings of $4 million as of December 31, 2018 . The fair values of the debt instruments were based on discounted cash flows and interest rates then currently available to the Company for instruments of the same remaining maturities and were measured using level 2 inputs. Call and put option on noncontrolling interest In December 2019, PPG paid cash to acquire the remaining noncontrolling interest in a coatings business, of which PPG previously had a majority interest. Prior to this transaction, the minority shareholder’s results were included in Net income attributable to noncontrolling interests on the consolidated statement of income. Historically, PPG recorded the noncontrolling interest in this consolidated affiliate as a liability instead of equity on its consolidated balance sheets due to call and put option provisions associated with the noncontrolling interest, which had similar terms. As a result of the December 2019 transaction, this liability is no longer outstanding as of December 31, 2019 . As of December 31, 2018 , the liability was $40 million .

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share ($ in millions, except per share amounts) 2019 2018 2017 Earnings per common share (attributable to PPG) Income from continuing operations, net of tax $1,243 $1,323 $1,369 Income from discontinued operations, net of tax — 18 225 Net income (attributable to PPG) $1,243 $1,341 $1,594 Weighted average common shares outstanding 236.9 243.9 256.1 Effect of dilutive securities: Stock options 0.6 0.8 0.9 Other stock compensation plans 0.7 0.7 0.8 Potentially dilutive common shares 1.3 1.5 1.7 Adjusted weighted average common shares outstanding 238.2 245.4 257.8 Earnings per common share (attributable to PPG): Income from continuing operations, net of tax $5.25 $5.43 $5.34 Income from discontinued operations, net of tax — 0.07 0.88 Net income (attributable to PPG) $5.25 $5.50 $6.22 Earnings per common share - assuming dilution (attributable to PPG) Income from continuing operations, net of tax $5.22 $5.40 $5.31 Income from discontinued operations, net of tax — 0.07 0.87 Net income (attributable to PPG) $5.22 $5.47 $6.18 There were 0.9 million , 1.0 million , and 0.6 million outstanding stock options excluded in 2019 , 2018 and 2017

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes by taxing jurisdiction and by significant components consisted of the following: ($ in millions) 2019 2018 2017 Current U.S. federal $86 $7 $179 U.S. state and local 15 4 49 Foreign 296 297 349 Total current income tax expense $397 $308 $577 Deferred U.S. federal ($1 ) $44 $107 U.S. state and local 13 7 (16 ) Foreign (17 ) (6 ) (53 ) Total deferred income tax expense ($5 ) $45 $38 Total income tax expense $392 $353 $615 A reconciliation of the statutory U.S. corporate federal income tax rate to the Company’s effective tax rate follows: 2019 2018 2017 U.S. federal income tax rate 21.0 % 21.0 % 35.0 % Changes in rate due to: U.S. tax cost/(benefit) - Tax Cuts & Jobs Act 0.3 (2.5 ) 11.0 U.S./foreign tax differential 2.9 3.3 (9.3 ) U.S. current tax benefit on foreign exchange realization — — (4.9 ) U.S. tax incentives (0.7 ) (1.0 ) (2.3 ) U.S. tax benefit on foreign dividends (0.9 ) (0.4 ) (1.9 ) U.S. state and local taxes 1.3 0.5 1.1 U.S. deferred tax benefit on foreign income — — (0.6 ) Other (0.3 ) — 2.6 Effective income tax rate 23.6 % 20.9 % 30.7 % The effective income tax rate for 2019 and 2018 was 23.6% and 20.9% , respectively. The lower effective income tax rate in 2018 reflected a net benefit for provisional adjustments related to the Tax Cuts and Jobs Act. The company continues to realize tax credit incentives mostly comprised of U.S. benefits for research and development activities. Provisions for income taxes in 2019 also included a net benefit of global intangible low taxed income expense, foreign derived intangible income deductions and foreign tax credits. The total benefit for these U.S. provision items in 2019 was $22 million . In 2018, PPG implemented updated regulations for certain aspects of the Tax Cuts and Jobs Act and PPG completed its accounting for the provisional amounts recognized in its consolidated financial statements in 2017. The finalization of the provisional accounting during 2018 resulted in a net tax benefit of $42 million , which consisted of a benefit of $20 million related to unrepatriated foreign earnings, a benefit of $22 million for adjustments to certain deferred taxes, a benefit of $14 million for foreign derived intangible income, partially offset by an expense of $14 million for global intangible low taxed income. On December 22, 2017, the U.S. enacted the Tax Cuts and Jobs Act which, among other things lowered the U.S. corporate statutory income tax rate from 35% to 21% , eliminated certain deductible items and added other deductible items for corporations, imposed a tax on unrepatriated foreign earnings and eliminated U.S. taxes on most future foreign earnings. In December 2017, as a result of the Tax Cuts and Jobs Act, the Company recorded a provisional net tax charge of $134 million , which included a tax on unrepatriated earnings of $250 million , a charge of approximately $125 million related to the remeasurement of U.S. deferred taxes at the new enacted statutory rate, partially offset by a benefit from the reversal of an existing deferred tax liability on repatriated foreign earnings of approximately $150 million and a benefit resulting from PPG’s decision to accelerate recognition of certain U.S. tax attributes during the fourth quarter. The total tax expense for 2017 includes a deferred tax benefit of $22 million related to the $60 million of pretax pension settlement charges discussed in Note 13 , “ Employee Benefit Plans .” Income before income taxes of the Company’s U.S. operations for 2019 , 2018 and 2017 was $596 million , $571 million and $713 million , respectively. Income before income taxes of the Company’s foreign operations for 2019 , 2018 and 2017 was $1,065 million , $1,122 million and $1,292 million , respectively. Deferred income taxes Deferred income taxes are provided for the effect of temporary differences that arise because there are certain items treated differently for financial accounting than for income tax reporting purposes. The deferred tax assets and liabilities are determined by applying the enacted tax rate in the year in which the temporary difference is expected to reverse. ($ in millions) 2019 2018 Deferred income tax assets related to Employee benefits $382 $366 Contingent and accrued liabilities 148 149 Operating loss and other carry-forwards 225 251 Inventories 4 7 Other 87 82 Valuation allowance (158 ) (164 ) Total $688 $691 Deferred income tax liabilities related to Property $277 $262 Intangibles 594 545 Employee benefits 65 46 Other 2 15 Total $938 $868 Deferred income tax liabilities – net ($250 ) ($177 ) Net operating loss and credit carryforwards ($ in millions) 2019 2018 Expiration Available net operating loss carryforwards, Tax Effected: Indefinite expiration $157 $124 NA Definite expiration 25 68 2020 - 2039 Total $182 $192 NA Income tax credit carryforwards $59 $61 2020 - 2039 A valuation allowance of $158 million and $164 million has been established for carry-forwards and certain other items at December 31, 2019 and 2018 , respectively, when the ability to utilize them is not likely. Undistributed foreign earnings The Company had $3.6 billion and $3.0 billion of undistributed earnings of non-U.S. subsidiaries as of December 31, 2019 and 2018 , respectively. These amounts relate to approximately 290 subsidiaries in approximately 75 taxable jurisdictions. The Company estimates repatriation of undistributed earnings of non-U.S. subsidiaries as of December 31, 2019 and 2018 would have resulted in a tax cost of $32 million and $ 19 million , respectively. PPG has established deferred tax liabilities on certain undistributed earnings, namely in connection with divestitures and the funding of the Pittsburgh Corning Asbestos Trust (refer to Note 14 , “ Commitments and Contingent Liabilities ”). As of December 31, 2019, with exception of the aforementioned deferred liability established for the asbestos trust, the Company has not changed its intention to reinvest foreign earnings indefinitely or repatriate when it is tax effective to do so, and as such, has not established a liability for foreign withholding taxes or other costs that would be incurred if the earnings were repatriated. Unrecognized tax benefits The Company files federal, state and local income tax returns in numerous domestic and foreign jurisdictions. In most tax jurisdictions, returns are subject to examination by the relevant tax authorities for a number of years after the returns have been filed. The Company is no longer subject to examinations by tax authorities in any major tax jurisdiction for years before 2008. Additionally, the Company is no longer subject to examination by the Internal Revenue Service for U.S. federal income tax returns filed for years through 2014. The examinations of the Company’s U.S. federal income tax returns for 2015 through 2016 are currently underway. A reconciliation of the total amounts of unrecognized tax benefits (excluding interest and penalties) as of December 31 follows: ($ in millions) 2019 2018 2017 January 1 $166 $148 $94 Current year tax positions - additions 25 36 37 Prior year tax positions - additions 4 17 26 Prior year tax positions - reductions (9 ) (6 ) — Statute of limitations expirations (6 ) (9 ) (8 ) Settlements (12 ) (15 ) (10 ) Foreign currency translation (1 ) (5 ) 9 December 31 $167 $166 $148 The Company expects that any reasonably possible change in the amount of unrecognized tax benefits in the next 12 months would not be significant. The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate was $143 million as of December 31, 2019 . Interest and penalties ($ in millions) 2019 2018 2017 Accrued interest and penalties related to unrecognized tax benefits $17 $16 $15 Loss recognized in income tax expense related to interest and penalties $1 $2 $4 The Company recognizes accrued interest and penalties related to unrecognized tax benefits in income tax expense.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans Defined Benefit Plans PPG has defined benefit pension plans that cover certain employees worldwide. The principal defined benefit pension plans are those in the U.S., Canada, the Netherlands and the U.K. These plans in the aggregate represent approximately 93% of PPG’s total projected benefit obligation at December 31, 2019 , of which the U.S. defined benefit pension plans represent the largest component. As of January 1, 2006, the Company’s U.S. salaried defined benefit plans were closed to new entrants. In 2011, the Company approved amendments related to certain U.S. defined benefit plans so that depending upon the affected employee’s combined age and years of service to PPG, certain employees stopped or will stop accruing benefits either in 2011 or at the end of 2020. The affected employees will participate in the Company’s defined contribution retirement plans from the date their benefits under their respective defined benefit plans are frozen. The Company has amended other defined benefit plans in other countries in a similar way and plans to continue reviewing and potentially amending other PPG defined benefit plans in the future. Postretirement medical PPG sponsors welfare benefit plans that provide postretirement medical and life insurance benefits for certain U.S. and Canadian employees and their dependents of which the U.S. welfare benefit plans represent approximately 87% of PPG’s total projected benefit obligation at December 31, 2019 . Salaried and certain hourly employees in the U.S. hired on or after October 1, 2004, or rehired on or after October 1, 2012 are not eligible for postretirement medical benefits. These plans in the U.S. and Canada require retiree contributions based on retiree-selected coverage levels for certain retirees and their dependents and provide for sharing of future benefit cost increases between PPG and participants based on management discretion. The Company has the right to modify, amend or terminate certain of these benefit plans in the future. Effective January 1, 2017, the Company-sponsored Medicare-eligible plans were replaced by a Medicare private exchange. The announcement of this plan design change triggered a remeasurement of PPG’s retiree medical benefit obligation using prevailing interest rates. The plan design change resulted in a $306 million reduction in the Company's postretirement benefit obligation. PPG accounted for the plan design change prospectively, and the impact will be amortized to periodic postretirement benefit cost over a 5.6 year period through 2022. The following table sets forth the changes in projected benefit obligations (“PBO”) (as calculated as of December 31), plan assets, the funded status and the amounts recognized on the accompanying consolidated balance sheet for the Company’s defined benefit pension and other postretirement benefit plans: Defined Benefit Pension Plans United States International Total PPG ($ in millions) 2019 2018 2019 2018 2019 2018 Projected benefit obligation, January 1 $1,582 $1,706 $1,518 $1,756 $3,100 $3,462 Service cost 13 17 10 11 23 28 Interest cost 64 57 41 40 105 97 Actuarial losses (gains) - net 263 (129 ) 186 (117 ) 449 (246 ) Benefits paid (80 ) (70 ) (64 ) (55 ) (144 ) (125 ) Plan transfers — — — (8 ) — (8 ) Foreign currency translation adjustments — — 34 (88 ) 34 (88 ) Settlements and curtailments — — (4 ) (24 ) (4 ) (24 ) Other — 1 (2 ) 3 (2 ) 4 Projected benefit obligation, December 31 $1,842 $1,582 $1,719 $1,518 $3,561 $3,100 Market value of plan assets, January 1 $1,140 $1,196 $1,478 $1,687 $2,618 $2,883 Actual return on plan assets 219 (82 ) 190 (53 ) 409 (135 ) Company contributions — 75 13 24 13 99 Benefits paid (55 ) (49 ) (56 ) (53 ) (111 ) (102 ) Plan settlements — — (4 ) (24 ) (4 ) (24 ) Foreign currency translation adjustments — — 42 (95 ) 42 (95 ) Other — — (2 ) (8 ) (2 ) (8 ) Market value of plan assets, December 31 $1,304 $1,140 $1,661 $1,478 $2,965 $2,618 Funded Status ($538 ) ($442 ) ($58 ) ($40 ) ($596 ) ($482 ) Amounts recognized in the Consolidated Balance Sheet: Other assets (long-term) — — 183 189 183 189 Accounts payable and accrued liabilities (26 ) (18 ) (8 ) (8 ) (34 ) (26 ) Accrued pensions (512 ) (424 ) (233 ) (221 ) (745 ) (645 ) Net liability recognized ($538 ) ($442 ) ($58 ) ($40 ) ($596 ) ($482 ) Other Postretirement Benefit Plans United States International Total PPG ($ in millions) 2019 2018 2019 2018 2019 2018 Projected benefit obligation, January 1 $587 $641 $94 $112 $681 $753 Service cost 8 9 — 1 8 10 Interest cost 23 21 3 3 26 24 Plan amendments (17 ) — — — (17 ) — Actuarial losses (gains) - net 59 (38 ) 1 (9 ) 60 (47 ) Benefits paid (44 ) (45 ) (5 ) (4 ) (49 ) (49 ) Foreign currency translation adjustments — — 4 (8 ) 4 (8 ) Other — (1 ) (1 ) (1 ) (1 ) (2 ) Projected benefit obligation, December 31 $616 $587 $96 $94 $712 $681 Amounts recognized in the Consolidated Balance Sheet: Accounts payable and accrued liabilities (46 ) (48 ) (5 ) (4 ) (51 ) (52 ) Other postretirement benefits (570 ) (539 ) (91 ) (90 ) (661 ) (629 ) Net liability recognized ($616 ) ($587 ) ($96 ) ($94 ) ($712 ) ($681 ) The PBO is the actuarial present value of benefits attributable to employee service rendered to date, including the effects of estimated future pay increases. The accumulated benefit obligation (“ABO”) is the actuarial present value of benefits attributable to employee service rendered to date, but does not include the effects of estimated future pay increases. The ABO for all defined benefit pension plans as of December 31, 2019 and 2018 was $3.4 billion and $2.9 billion , respectively. The following table details the pension plans where the benefit liability exceeds the fair value of the plan assets: Pensions ($ in millions) 2019 2018 Plans with PBO in Excess of Plan Assets: Projected benefit obligation $2,223 $1,935 Fair value of plan assets $1,449 $1,269 Plans with ABO in Excess of Plan Assets: Accumulated benefit obligation $2,176 $1,883 Fair value of plan assets $1,449 $1,269 Net actuarial losses and prior service cost/(credit) deferred in accumulated other comprehensive loss Pensions Other Postretirement Benefits ($ in millions) 2019 2018 2019 2018 Accumulated net actuarial losses $920 $800 $166 $113 Accumulated prior service cost (credit) 2 2 (138 ) (178 ) Total $922 $802 $28 ($65 ) The accumulated net actuarial losses for pensions and other postretirement benefits relate primarily to historical declines in the discount rates. The accumulated net actuarial losses exceeded 10% of the higher of the market value of plan assets or the PBO at the beginning of each of the last three years; therefore, amortization of such excess has been included in net periodic benefit costs for pension and other postretirement benefits in these periods. The amortization period is the average remaining service period of active employees expected to receive benefits unless a plan is mostly inactive in which case the amortization period is the average remaining life expectancy of the plan participants. Accumulated prior service cost (credit) is amortized over the future service periods of those employees who are active at the dates of the plan amendments and who are expected to receive benefits. The net increase in Accumulated other comprehensive loss (pretax) in 2019 relating to defined benefit pension and other postretirement benefits is primarily attributable to pension and other postretirement plan discount rate declines, as follows: ($ in millions) Pensions Other Postretirement Benefits Net actuarial loss arising during the year $179 $60 New prior service credit — (17 ) Amortization of actuarial loss (62 ) (8 ) Amortization of prior service credit — 57 Foreign currency translation adjustments 5 1 Impact of settlements and curtailments (2 ) — Net change $120 $93 The 2019 net actuarial loss related to the Company’s pension and other postretirement benefit plans was primarily due to a decrease in the weighted average discount rate used to determine the benefit obligation at December 31, 2019 , partially offset by asset performance gains on plan assets for the year. Net periodic benefit cost Pensions Other Postretirement Benefits ($ in millions) 2019 2018 2017 2019 2018 2017 Service cost $23 $28 $33 $8 $10 $10 Interest cost 105 97 98 26 24 24 Expected return on plan assets (139 ) (150 ) (141 ) — — — Amortization of prior service credit — — — (57 ) (60 ) (59 ) Amortization of actuarial losses 62 63 75 8 19 12 Settlements, curtailments, and special termination benefits 3 5 60 — — — Net periodic benefit cost/(income) $54 $43 $125 ($15 ) ($7 ) ($13 ) Service cost for net periodic pension and other postretirement benefit costs is included in Cost of sales, exclusive of depreciation and amortization, Selling, general and administrative, and Research and development, net in the accompanying consolidated statements of income. Except for Pension settlement charges in 2017, all other components of net periodic benefit cost are recorded in Other charges in the accompanying consolidated statements of income. Key assumptions The following weighted average assumptions were used to determine the benefit obligation for the Company’s defined benefit pension and other postretirement plans as of December 31, 2019 and 2018 : United States International Total PPG 2019 2018 2019 2018 2019 2018 Discount rate 3.3 % 4.4 % 2.2 % 2.9 % 2.8 % 3.7 % Rate of compensation increase 2.5 % 1.5 % 2.8 % 0.9 % 2.6 % 1.2 % The following weighted average assumptions were used to determine the net periodic benefit cost for the Company’s defined benefit pension and other postretirement benefit plans for the three years in the period ended December 31, 2019 : 2019 2018 2017 Discount rate 3.7 % 3.2 % 3.6 % Expected return on assets 5.4 % 5.4 % 5.4 % Rate of compensation increase 1.8 % 1.2 % 1.3 % These assumptions for each plan are reviewed on an annual basis. In determining the expected return on plan asset assumption, the Company evaluates the mix of investments that comprise each plan’s assets and external forecasts of future long-term investment returns. The Company compares the expected return on plan assets assumption to actual historic returns to ensure reasonability. For 2019 , the return on plan assets assumption for PPG’s U.S. defined benefit pension plans was 7.4% . A change in the rate of return of 100 basis points, with other assumptions held constant, would impact 2019 net periodic pension expense by $13 million . The global expected return on plan assets assumption to be used in determining 2020 net periodic pension expense will be 5.0% ( 7.4% for the U.S. plans only). The discount rates used in accounting for pension and other postretirement benefits are determined using a yield curve constructed of high-quality fixed-income securities as of the measurement date and using the plans’ projected benefit payments. The Company has elected to use a full yield curve approach in the estimation of the service and interest cost components of net periodic pension benefit cost (income) for countries with significant pension plans. The full yield curve approach (also known as the split-rate or spot-rate method) allows the Company to align the applicable discount rates with the cost of additional service being earned and the interest being accrued on these obligations. A change in the discount rate of 100 basis points, with all other assumptions held constant, would impact 2020 net periodic benefit expense for our defined benefit pension and other postretirement benefit plans by $16 million and $6 million , respectively. In 2019, the Company updated mortality tables used to calculate its U.S. defined benefit pension and other postretirement benefit liabilities. The Company considered the available mortality tables released by the Society of Actuaries’ Retirement Plans Experience Committee and performed a review of its own mortality history, as well the industry in which the Company operates to assess future improvements in mortality rates based on its U.S. population. The Company chose to value its U.S. defined benefit pension and other postretirement benefit liabilities using a slightly modified assumption of future mortality which better approximates our plan participant population. The weighted-average health care cost trend rate (inflation) used for 2019 was 5.0% declining to a projected 4.3% in the year 2039 . For 2020 , the assumed weighted-average health care cost trend rate used will be 4.8% declining to a projected 4.3% between 2020 and 2039 for medical and prescription drug costs, respectively. These assumptions are reviewed on an annual basis. In selecting rates for current and long-term health care cost assumptions, the Company takes into consideration a number of factors, including the Company’s actual health care cost increases, the design of the Company’s benefit programs, the demographics of the Company’s active and retiree populations and external expectations of future medical cost inflation rates. Contributions to defined benefit pension plans ($ in millions) 2019 2018 2017 U.S. defined benefit pension plans $— $75 $54 Non-U.S. defined benefit pension plans $13 $24 $33 PPG made voluntary contributions of $75 million to its U.S. defined benefit pension plans in 2018. Contributions made to PPG’s non-U.S. defined benefit pension plans in 2019 and 2018 were required by local funding requirements. PPG expects to make mandatory contributions to its non-U.S. plans in the range of $15 million to $20 million in 2020 . PPG may make voluntary contributions to its defined benefit pension plans in 2020 and beyond. Benefit payments The estimated benefits expected to be paid under the Company’s defined benefit pension and other postretirement benefit plans are: ($ in millions) Pensions Other Postretirement Benefits 2020 $145 $51 2021 $143 $51 2022 $146 $50 2023 $153 $49 2024 $160 $48 2025 to 2029 $845 $209 U.S. Qualified Pension Beginning in 2012, the Company offered a lump sum payout option that gave certain terminated vested participants in certain U.S. defined benefit pension plans the opportunity to take a one-time lump sum cash payment in lieu of receiving a future monthly annuity. During 2017, PPG paid $87 million in lump sum benefits to terminated vested participants who elected to participate in the program. As the lump-sum payments were in excess of the expected 2017 service and interest costs for the qualified pension plans, PPG remeasured the periodic benefit obligation of the qualified plans and recorded a settlement charge totaling $35 million . U.S. Non-qualified Pension In the first quarter 2017, PPG made lump-sum payments to certain retirees who had participated in PPG's U.S. non-qualified pension plan (the "Nonqualified Plan") totaling approximately $40 million . As the lump-sum payments were in excess of the expected 2017 service and interest costs for the Nonqualified Plan, PPG remeasured the periodic benefit obligation of the Nonqualified Plan as of March 1, 2017 and recorded a settlement charge totaling $22 million . Plan assets Each PPG sponsored defined benefit pension plan is managed in accordance with the requirements of local laws and regulations governing defined benefit pension plans for the exclusive purpose of providing pension benefits to participants and their beneficiaries. Investment committees comprised of PPG managers have fiduciary responsibility to oversee the management of pension plan assets by third party asset managers. Pension plan assets are held in trust by financial institutions and managed on a day-to-day basis by the asset managers. The asset managers receive a mandate from each investment committee that is aligned with the asset allocation targets established by each investment committee to achieve the plan’s investment strategies. The performance of the asset managers is monitored and evaluated by the investment committees throughout the year. Pension plan assets are invested to generate investment earnings over an extended time horizon to help fund the cost of benefits promised under the plans while mitigating investment risk. The asset allocation targets established for each pension plan are intended to diversify the investments among a variety of asset categories and among a variety of individual securities within each asset category to mitigate investment risk and provide each plan with sufficient liquidity to fund the payment of pension benefits to retirees. The following summarizes the weighted average target pension plan asset allocation as of December 31, 2019 and 2018 for all PPG defined benefit plans: Asset Category 2019 2018 Equity securities 15-45% 15-45% Debt securities 30-65% 30-65% Real estate 0-10% 0-10% Other 20-40% 20-40% The fair values of the Company’s pension plan assets at December 31, 2019 and 2018 , by asset category, are as follows: December 31, 2019 December 31, 2018 ($ in millions) Level 1 (1) Level 2 (1) Level 3 (1) Total Level 1 (1) Level 2 (1) Level 3 (1) Total Asset Category Equity securities: U.S. Large cap $58 $80 $— $138 $43 $94 $— $137 Small cap 41 — — 41 23 — — 23 Non-U.S. Developed and emerging markets (2) 143 84 — 227 115 103 — 218 Debt securities: Cash and cash equivalents 10 16 — 26 3 19 — 22 Corporate (3) U.S. (4) — 337 77 414 — 220 77 297 Developed and emerging markets (2) — 2 — 2 — 4 — 4 Diversified (5) — 237 — 237 — 142 — 142 Government U.S. (4) 72 9 — 81 68 8 — 76 Developed markets — 7 — 7 — 6 — 6 Other (6) — 18 377 395 — 14 359 373 Real estate, hedge funds, and other — 303 381 684 — 304 359 663 Total assets in the fair value hierarchy $324 $1,093 $835 $2,252 $252 $914 $795 $1,961 Common-collective trusts (7) — — — 713 — — — 657 Total Investments $324 $1,093 $835 $2,965 $252 $914 $795 $2,618 (1) These levels refer to the accounting guidance on fair value measurement described in Note 10 , “ Financial Instruments, Hedging Activities and Fair Value Measurements .” (2) These amounts represent holdings in investment grade debt or equity securities of issuers in both developed markets and emerging economies. (3) This category represents investment grade debt securities from a diverse set of industry issuers. (4) These investments are primarily long duration fixed income securities. (5) This category represents commingled funds invested in diverse portfolios of debt securities. (6) This category includes mortgage-backed and asset backed debt securities, municipal bonds and other debt securities including derivatives. (7) Certain investments that are measured at net asset value per share (or its equivalent) are not required to be classified in the fair value hierarchy. The change in the fair value of the Company’s Level 3 pension assets for the years ended December 31, 2019 and 2018 was as follows: ($ in millions) Real Estate Other Debt Securities Hedge Funds and Other Assets Total January 1, 2018 $138 $418 $446 $1,002 Realized gains/(losses) 9 (29 ) 10 (10 ) Unrealized losses — — (28 ) (28 ) Transfers out, net (6 ) (12 ) (119 ) (137 ) Foreign currency losses (4 ) (18 ) (10 ) (32 ) December 31, 2018 $137 $359 $299 $795 Realized gains/(losses) 18 38 (3 ) 53 Unrealized (losses)/gains (7 ) — 15 8 Transfers (out)/in, net (27 ) (12 ) 17 (22 ) Foreign currency gains/(losses) 2 (8 ) 7 1 December 31, 2019 $123 $377 $335 $835 Real estate properties are externally appraised at least annually by reputable, independent appraisal firms. Property valuations are also reviewed on a regular basis and are adjusted if there has been a significant change in circumstances related to the property since the last valuation. Other debt securities consist of insurance contracts, which are externally valued by insurance companies based on the present value of the expected future cash flows. Hedge funds consist of a wide range of investments which target a relatively stable investment return. The underlying funds are valued at different frequencies, some monthly and some quarterly, based on the value of the underlying investments. Other assets consist primarily of small investments in private equity funds and senior secured debt obligations of non-investment grade borrowers. Sale of the flat glass business In 2018, PPG transferred pension assets of $20 million as a result of the sale of its flat glass business in 2016 and subsequent finalization of the transfer of pension obligations to the buyer. Other Plans Employee savings plans PPG’s Employee Savings Plans (“Savings Plans”) cover substantially all employees in the U.S., Puerto Rico and Canada. The Company makes matching contributions to the Savings Plans, at management’s discretion, based upon participants’ savings, subject to certain limitations. For most participants not covered by a collective bargaining agreement, Company-matching contributions are established each year at the discretion of the Company and are applied to participant savings up to a maximum of 6% of eligible participant compensation. For those participants whose employment is covered by a collective bargaining agreement, the level of Company-matching contribution, if any, is determined by the relevant collective bargaining agreement. The Company-matching contribution remained at 100% for 2019 . Compensation expense and cash contributions related to the Company match of participant contributions to the Savings Plans for 2019 , 2018 , and 2017 totaled $49 million , $47 million and $46 million , respectively. A portion of the Savings Plans qualifies under the Internal Revenue Code as an Employee Stock Ownership Plan. Accordingly, dividends received on PPG shares held in that portion of the Savings Plans totaling $11 million , $13 million , and $14 million for 2019 , 2018 , and 2017 , respectively, are deductible for PPG’s U.S. Federal tax purposes. Defined contribution plans Additionally, the Company has defined contribution plans for certain employees in the U.S., China, United Kingdom, Australia, Italy, and other countries. The U.S. defined contribution plan is in the Employee Savings Plan and eligible employees receive a contribution equal to between 2% and 5% of annual compensation, based on age and years of service. For the years ended December 31, 2019 , 2018 , and 2017 , the Company recognized expense for its defined contribution retirement plans of $70 million , $63 million and $57 million , respectively. The Company’s annual cash contributions to its defined contribution retirement plans approximated the expense recognized in each year. Deferred compensation plan The Company has a deferred compensation plan for certain key managers which allows them to defer a portion of their compensation in a phantom PPG stock account or other phantom investment accounts. The amount deferred earns a return based on the investment options selected by the participant. The amount owed to participants is an unfunded and unsecured general obligation of the Company. Upon retirement, death, disability, termination of employment, scheduled payment or unforeseen emergency, the compensation deferred and related accumulated earnings are distributed in accordance with the participant’s election in cash or in PPG stock, based on the accounts selected by the participant. The plan provides participants with investment alternatives and the ability to transfer amounts between the phantom non-PPG stock investment accounts. To mitigate the impact on compensation expense of changes in the market value of the liability, the Company has purchased a portfolio of marketable securities that mirror the phantom non-PPG stock investment accounts selected by the participants, except the money market accounts. These investments are carried by PPG at fair market value, and the changes in market value of these securities are also included in Income before income taxes in the consolidated statement of income. Trading occurs in this portfolio to align the securities held with the participant’s phantom non-PPG stock investment accounts, except the money market accounts. The cost (benefit) of the deferred compensation plan, comprised of dividend equivalents accrued on the phantom PPG stock account, investment income and the change in market value of the liability, was $21 million , $(1) million and $19 million in 2019 , 2018 and 2017 , respectively. These amounts are included in Selling, general and administrative in the consolidated statements of income. The change in market value of the investment portfolio was income (expense) of $20 million , $(2) million , and $18 million in 2019 , 2018 and 2017 , respectively, and is also included in Selling, general and administrative in the consolidated statements of income. The Company’s obligations under this plan, which are included in Accounts payable and accrued liabilities and Other liabilities on the consolidated balance sheet, totaled $123 million and $110 million as of December 31, 2019 and 2018 , respectively, and the investments in marketable securities, which are included in Investments and Other current assets on the accompanying consolidated balance sheet, were $85 million and $73 million as of December 31, 2019 and 2018 , respectively.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Commitments and Contingent Liabilities PPG is involved in a number of lawsuits and claims, both actual and potential, including some that it has asserted against others, in which substantial monetary damages are sought. These lawsuits and claims may relate to contract, patent, environmental, product liability, antitrust, employment and other matters arising out of the conduct of PPG’s current and past business activities. To the extent that these lawsuits and claims involve personal injury, property damage, and certain other claims, PPG believes it has adequate insurance; however, certain of PPG’s insurers are contesting coverage with respect to some of these claims, and other insurers, as they had prior to the asbestos settlement described below, may contest coverage with respect to some of the asbestos claims. PPG’s lawsuits and claims against others include claims against insurers and other third parties with respect to actual and contingent losses related to environmental, asbestos and other matters. The results of any current or future litigation and claims are inherently unpredictable. However, management believes that, in the aggregate, the outcome of all lawsuits and claims involving PPG will not have a material effect on PPG’s consolidated financial position or liquidity; however, such outcome may be material to the results of operations of any particular period in which costs, if any, are recognized. Shareholder Class Action On May 20, 2018, a putative securities class action lawsuit was filed in the U.S. District Court for the Central District of California against the Company and three of its current and former officers. On September 21, 2018, an Amended Class Action Complaint was filed in the lawsuit. The Amended Complaint, captioned Trevor Mild v. PPG Industries, Inc., Michael H. McGarry, Vincent J. Morales, and Mark C. Kelly, asserted securities fraud claims under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 on behalf of a putative class of persons who purchased or otherwise acquired stock of the Company between January 19, 2017 and May 10, 2018. The allegations related to, among other things, allegedly false and misleading statements and/or failures to disclose information about the Company’s business, operations and prospects. The parties reached a settlement in principal on May 1, 2019. On June 2, 2019, the plaintiff filed with the Court a Petition for Preliminary Approval of the proposed settlement, including the proposed settlement amount of $25 million . On November 22, 2019, the Court entered final judgment approving the settlement. PPG’s insurance carriers confirmed to the Company insurance coverage for the full amount of the settlement. The settlement payment is expected to occur in 2020. As of December 31, 2019, an accrued liability of $25 million for the proposed settlement amount and a corresponding asset for the insurance coverage of $25 million is included in Accounts payable and accrued liabilities and Other current assets, respectively. Asbestos Matters Prior to 2000, the Company had been named as a defendant in numerous claims alleging bodily injury from (i) exposure to asbestos-containing products allegedly manufactured, sold or distributed by the Company, its subsidiaries, or for which they are otherwise alleged to be liable; (ii) exposure to asbestos allegedly present at a facility owned or leased by the Company; or (iii) exposure to asbestos-containing products of Pittsburgh Corning Corporation (“PC”) for which the Company was alleged to be liable under a variety of legal theories (the Company and Corning Incorporated were each 50% shareholders in PC prior to April 27, 2016). Pittsburgh Corning Corporation asbestos bankruptcy In 2000, PC filed for Chapter 11 in the U.S. Bankruptcy Court for the Western District of Pennsylvania in an effort to permanently and comprehensively resolve all of its pending and future asbestos-related liability claims. The Bankruptcy Court subsequently entered a series of orders preliminarily enjoining the prosecution of asbestos litigation against PPG until after the effective date of a confirmed PC plan of reorganization. During the pendency of this preliminary injunction staying asbestos litigation against PPG, PPG and certain of its historical liability insurers negotiated a settlement with representatives of present and future asbestos claimants. That settlement was incorporated into a PC plan of reorganization that was confirmed by the Bankruptcy Court on May 24, 2013 and ultimately became effective on April 27, 2016. With the effectiveness of the plan, the preliminary injunction staying the prosecution of asbestos litigation against PPG expired by its own terms on May 27, 2016. In accordance with the settlement, the Bankruptcy Court issued a permanent channeling injunction under Section 524(g) of the Bankruptcy Code that prohibits present and future claimants from asserting claims against PPG that arise, in whole or in part, out of exposure to asbestos or asbestos-containing products manufactured, sold and/or distributed by PC or asbestos on or emanating from any PC premises. The channeling injunction, by its terms, also prohibits codefendants in cases that are subject to the channeling injunction from asserting claims against PPG for contribution, indemnification or other recovery. The channeling injunction also precludes the prosecution of claims against PPG arising from alleged exposure to asbestos or asbestos-containing products to the extent that a claimant is alleging or seeking to impose liability, directly or indirectly, for the conduct of, claims against, or demands on PC by reason of PPG’s prior: (i) ownership of a financial interest in PC; (ii) involvement in the management of PC, or service as an officer, director or employee of PC or a related party; (iii) provision of insurance to PC or a related party; or (iv) involvement in a financial transaction affecting the financial condition of PC or a related party. The foregoing PC related claims are referred to as “PC Relationship Claims.” The Bankruptcy Court’s channeling injunction channels the Company’s liability for PC Relationship Claims to a trust funded in part by PPG and its participating insurers for the benefit of current and future PC asbestos claimants (the “Trust”). The Trust is the sole recourse for holders of PC Relationship Claims. PPG and its affiliates have no further liability or responsibility for, and are permanently protected from, pending and future PC Relationship Claims. The channeling injunction does not extend to present and future claims against PPG that arise out of alleged exposure to asbestos or asbestos-containing products historically manufactured, sold and/or distributed by PPG or its subsidiaries or for which they are alleged to be liable that are not PC Relationship Claims, and does not extend to claims against PPG alleging personal injury allegedly caused by asbestos on premises presently or formerly owned, leased or occupied by PPG. These claims are referred to as “non-PC Relationship Claims.” Non-PC relationship claims With respect to the asbestos-related claims pending against the Company at the time PC filed for bankruptcy, the Company considers such claims to fall within one or more of the following categories: (1) claims that have been closed or dismissed as a result of processes undertaken during the bankruptcy; (2) claims that may have been previously filed on the dockets of state and federal courts in various jurisdictions, but are inactive as to the Company; and (3) claims that are subject, in whole or in part, to the channeling injunction and thus will be resolved, in whole or in part, in accordance with the Trust procedures established under the PC bankruptcy reorganization plan. As a result of the foregoing, the Company does not consider these three categories of claims to be open or active litigation against it, although the Company cannot now determine whether, or the extent to which, any of these claims may in the future be reinstituted, reinstated, or revived such that they may become open and active non-PC Relationship Claims against it. Current open and active claims post-Pittsburgh Corning bankruptcy As of December 31, 2019, the Company was aware of approximately 605 open and active asbestos-related claims pending against the Company and certain of its subsidiaries. These claims consist of non-PC Relationship Claims against PPG and claims against a PPG subsidiary the Company acquired on April 1, 2013. The Company is defending these open and active claims vigorously. PPG has established reserves totaling approximately $190 million for asbestos-related claims that would not be channeled to the Trust which, based on presently available information, we believe will be sufficient to encompass all of PPG’s current and estimable potential future asbestos liabilities. These reserves, which are included within Other liabilities on the accompanying consolidated balance sheets, represent PPG’s best estimate of its liability for these claims. These reserves include a $162 million reserve established in 2009 in connection with an amendment to the PC plan of reorganization for non-PC Relationship Claims other than claims arising from premises-related exposures. PPG does not have sufficient current claim information or settlement history on which to base a better estimate of this liability in light of the fact that the Bankruptcy Court’s injunction staying most asbestos claims against the Company was in effect from April 2000 through May 2016. These reserves also include PPG’s best estimate, following an analysis performed in 2019 of its claims history and discussions with consultants and its counsel, of the value of the Company’s potential liability for premises-related non-PC Relationship Claims against it and claims against PPG’s subsidiary acquired on April 1, 2013 that are presently pending, and that are projected to be asserted through December 31, 2028. In the fourth quarter of 2019, PPG increased the reserve related to these matters and recognized a charge of approximately $10 million included in Other charges in the consolidated statement of income. PPG monitors the activity associated with its asbestos claims and evaluates, on a periodic basis, its estimated liability for such claims, its insurance assets then available, and all underlying assumptions to determine whether any adjustment to the reserves for these claims is required. The amount reserved for asbestos-related claims by its nature is subject to many uncertainties that may change over time, including (i) the ultimate number of claims filed; (ii) the amounts required to resolve both currently known and future unknown claims; (iii) the amount of insurance, if any, available to cover such claims; (iv) the unpredictable aspects of the litigation process, including a changing trial docket and the jurisdictions in which trials are scheduled; (v) the outcome of any trials, including potential judgments or jury verdicts; (vi) the lack of specific information in many cases concerning exposure for which PPG is allegedly responsible, and the claimants’ alleged diseases resulting from such exposure; and (vii) potential changes in applicable federal and/or state tort liability law. All of these factors may have a material effect upon future asbestos-related liability estimates. As a potential offset to any future asbestos financial exposure, under the PC plan of reorganization PPG retained, for its own account, the right to pursue insurance coverage from certain of its historical insurers that did not participate in the PC plan of reorganization. While the ultimate outcome of PPG’s asbestos litigation cannot be predicted with certainty, PPG believes that any financial exposure resulting from its asbestos-related claims will not have a material adverse effect on PPG’s consolidated financial position, liquidity or results of operations. Environmental Matters It is PPG’s policy to accrue expenses for environmental contingencies when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. Reserves for environmental contingencies are exclusive of claims against third parties and are generally not discounted. In management’s opinion, the Company operates in an environmentally sound manner and the outcome of the Company’s environmental contingencies will not have a material effect on PPG’s financial position or liquidity; however, any such outcome may be material to the results of operations of any particular period in which costs, if any, are recognized. Management anticipates that the resolution of the Company’s environmental contingencies will occur over an extended period of time. As remediation at certain legacy environmental sites progresses, PPG continues to refine its assumptions underlying the estimates of the expected future costs of its remediation programs. PPG’s ongoing evaluation may result in additional charges against income to increase the reserves for these sites. Remediation activities at our legacy sites are not related to the ongoing operations of PPG. In 2019, 2018 and 2017, certain charges have been recorded based on updated estimates to increase existing reserves for these sites. Certain other charges related to environmental remediation actions are also expensed as incurred. As of December 31, 2019 and 2018 , PPG had reserves for environmental contingencies associated with PPG’s former chromium manufacturing plant in Jersey City, New Jersey (“New Jersey Chrome”), glass and chemical manufacturing sites, and for other environmental contingencies, including current manufacturing locations and National Priority List sites. These reserves are reported as Accounts payable and accrued liabilities and Other liabilities in the accompanying consolidated balance sheet. Environmental Reserves ($ in millions) 2019 2018 New Jersey Chrome $134 $151 Glass and chemical 96 90 Other 74 50 Total $304 $291 Current Portion $62 $105 Pretax charges against income for environmental remediation costs are included in Other charges in the accompanying consolidated statement of income. The pretax charges and cash outlays related to such environmental remediation in 2019 , 2018 and 2017 , were as follows: ($ in millions) 2019 2018 2017 New Jersey Chrome $43 $62 $4 Other 34 16 6 Total $77 $78 $10 Cash outlays for environmental spending $77 $64 $44 The Company continues to analyze, assess and remediate the environmental issues associated with New Jersey Chrome as further discussed below. During the past three years, charges for estimated environmental remediation costs were significantly higher than PPG’s historical range. Excluding the charges related to New Jersey Chrome, pretax charges against income for environmental remediation have ranged between approximately $5 million and $35 million per year for the past 10 years. Management expects cash outlays for environmental remediation costs to range from $80 million to $100 million in 2020 and $20 million to $50 million annually from 2021 through 2024. It is possible that technological, regulatory and enforcement developments, the results of environmental studies and other factors could alter the Company’s expectations with respect to future charges against income and future cash outlays. Specifically, the level of expected future remediation costs and cash outlays is highly dependent upon activity related to New Jersey Chrome as discussed below. Remediation: New Jersey Chrome In June 2009, PPG entered into a settlement agreement with the New Jersey Department of Environmental Protection (“NJDEP”) and Jersey City, New Jersey (which had asserted claims against PPG for lost tax revenue) which was in the form of a Judicial Consent Order (the "JCO"). Under the JCO, PPG accepted sole responsibility for the remediation activities at its former chromium manufacturing location in Jersey City and 19 additional sites. The principal contaminant of concern is hexavalent chromium. The JCO also provided for the appointment of a court-approved Site Administrator who is responsible for establishing a master schedule for the remediation of the 20 PPG sites which existed at that time. One site was subsequently removed from the JCO process during 2014 and will be remediated separately at a future date. A total of 19 sites remain subject to the JCO process. The most significant assumptions underlying the estimate of remediation costs for all New Jersey Chrome sites are those related to the extent and concentration of chromium impacts in the soil, as these determine the quantity of soil that must be treated in place, the quantity that will have to be excavated and transported for offsite disposal, and the nature of disposal required. PPG regularly evaluates the assessments of costs incurred to date versus current progress and the potential cost impacts of the most recent information, including the extent of impacted soils, percentage of hazardous versus non-hazardous soils, daily soil excavation rates, and engineering, administrative and other associated costs. Based on these assessments, the reserve is adjusted accordingly. Principal factors affecting costs include refinements in the estimate of the mix of hazardous to non-hazardous soils to be excavated, an overall increase in soil volumes to be excavated, enhanced water management requirements, decreased daily soil excavation rates due to site conditions, initial estimates for remedial actions related to groundwater, and oversight and management costs. The reserve adjustments for the estimated costs to remediate all New Jersey Chrome sites are exclusive of any third party indemnification, as the recovery of any such amounts is uncertain. Groundwater remediation at the former Garfield Avenue chromium-manufacturing site and five adjacent sites is expected to occur over several years after NJDEP’s approval of the work plan. Ongoing groundwater monitoring will be utilized to develop a final groundwater remedial action work plan which is currently expected to be submitted to NJDEP in 2021. PPG’s financial reserve for remediation of all New Jersey Chrome sites is $134 million at December 31, 2019 . The major cost components of this liability continue to be related to excavation, transportation and disposal of impacted soil, as well as construction services. These components each account for approximately 20% , 14% and 28% of the accrued amount, respectively. There are multiple, future events yet to occur, including further remedy selection and design, remedy implementation and execution and applicable governmental agency or community organization approvals. Considerable uncertainty exists regarding the timing of these future events for the New Jersey Chrome sites. Further resolution of these events is expected to occur over the next several years. As these events occur and to the extent that the cost estimates of the environmental remediation remedies change, the existing reserve for this environmental remediation matter will continue to be adjusted. Remediation: Glass, Chemicals and Other Sites Among other sites at which PPG is managing environmental liabilities, remedial actions are occurring at a chemical manufacturing site in Barberton, Ohio, where PPG has completed a Facility Investigation and Corrective Measure Study under the United States Environmental Protection Agency's Resource Conservation and Recovery Act Corrective Action Program. PPG has also been addressing the impacts from a legacy plate glass manufacturing site in Kokomo, Indiana under the Voluntary Remediation Program of the Indiana Department of Environmental Management and a site associated with a legacy plate glass manufacturing site near Ford City, Pennsylvania under the Pennsylvania Land Recycling Program under the oversight of the Pennsylvania Department of Environmental Protection. PPG is currently performing additional investigation and remedial activities at these locations. With respect to certain other waste sites, the financial condition of other potentially responsible parties also contributes to the uncertainty of estimating PPG’s final costs. Although contributors of waste to sites involving other potentially responsible parties may face governmental agency assertions of joint and several liability, in general, final allocations of costs are made based on the relative contributions of wastes to such sites. PPG is generally not a major contributor to such sites. Remediation: Reasonably Possible Matters In addition to the amounts currently reserved for environmental remediation, the Company may be subject to loss contingencies related to environmental matters estimated to be as much as $100 million to $200 million . Such unreserved losses are reasonably possible but are not currently considered to be probable of occurrence. These reasonably possible unreserved losses relate to environmental matters at a number of sites, none of which are individually significant. The loss contingencies related to these sites include significant unresolved issues such as the nature and extent of contamination at these sites and the methods that may have to be employed to remediate them. The impact of evolving programs, such as natural resource damage claims, industrial site re-use initiatives and domestic and international remediation programs, also adds to the present uncertainties with regard to the ultimate resolution of this unreserved exposure to future loss. The Company’s assessment of the potential impact of these environmental contingencies is subject to considerable uncertainty due to the complex, ongoing and evolving process of investigation and remediation, if necessary, of such environmental contingencies, and the potential for technological and regulatory developments.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Shareholders' Equity	Shareholders' Equity A class of 10 million shares of preferred stock, without par value, is authorized but unissued. Common stock has a par value of $1.66 2 / 3 per share; 1.2 billion shares are authorized. Common Stock Treasury Stock Shares Outstanding January 1, 2017 581,146,136 (323,815,976 ) 257,330,160 Purchases — (7,427,557 ) (7,427,557 ) Issuances — 1,271,796 1,271,796 December 31, 2017 581,146,136 (329,971,737 ) 251,174,399 Purchases — (15,877,364 ) (15,877,364 ) Issuances — 564,399 564,399 December 31, 2018 581,146,136 (345,284,702 ) 235,861,434 Purchases — (2,722,800 ) (2,722,800 ) Issuances — 2,541,836 2,541,836 December 31, 2019 581,146,136 (345,465,666 ) 235,680,470 Per share cash dividends paid were $1.98 , $1.86 and $1.70 in 2019 , 2018 and 2017 , respectively.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss ($ in millions) Unrealized Foreign Currency Translation Adjustments Pension and Other Postretirement Benefit Adjustments, net of tax (c) Unrealized Gain/(Loss) on Derivatives, net of tax (d) Accumulated Other Comprehensive Loss January 1, 2017 ($1,798 ) ($571 ) $13 ($2,356 ) Current year deferrals to AOCI 542 — — 542 Current year deferrals to AOCI, net of tax (b) (311 ) 20 (4 ) (295 ) Reclassifications from AOCI to net income — 58 (6 ) 52 Period change $231 $78 ($10 ) $299 December 31, 2017 ($1,567 ) ($493 ) $3 ($2,057 ) Current year deferrals to AOCI (a) (292 ) — — (292 ) Current year deferrals to AOCI, net of tax (b) 148 (12 ) (7 ) 129 Reclassifications from AOCI to net income — 21 6 27 Period change ($144 ) $9 ($1 ) ($136 ) Reclassification from AOCI to Retained earnings - Adoption of ASU 2018-02 (23 ) (84 ) — (107 ) December 31, 2018 ($1,734 ) ($568 ) $2 ($2,300 ) Current year deferrals to AOCI (a) 71 — — 71 Current year deferrals to AOCI, net of tax (b) 36 (167 ) 1 (130 ) Reclassifications from AOCI to net income — 11 (2 ) 9 Period change $107 ($156 ) ($1 ) ($50 ) December 31, 2019 ($1,627 ) ($724 ) $1 ($2,350 ) (a) Except for income taxes of $7 million and $9 million as of December 31, 2019 and 2018 , respectively, related to foreign currency impacts of certain unasserted earnings, unrealized foreign currency translation adjustments related to translation of foreign denominated balance sheets are not presented net of tax given that no deferred U.S. income taxes have been provided on undistributed earnings of non-U.S. subsidiaries because they are deemed to be reinvested for an indefinite period of time. (b) The tax (cost)/benefit related to unrealized foreign currency translation adjustments on tax inter-branch transactions and net investment hedges as of December 31, 2019 , 2018 and 2017 was $(19) million , $4 million and $141 million , respectively. (c) The tax benefit/(cost) related to the adjustment for pension and other postretirement benefits as of December 31, 2019 , 2018 and 2017 was $57 million , $(34) million and $(33) million , respectively. Reclassifications from AOCI are included in the computation of net periodic benefit costs (See Note 13 , “ Employee Benefit Plans ”). The cumulative tax benefit related to the adjustment for pension and other postretirement benefits as of December 31, 2019 and 2018 was $266 million and $209 million , respectively. (d) The tax cost related to the change in the unrealized loss on derivatives as of December 31, 2019 , 2018 and 2017 was $1 million , $2 million , and $5 million , respectively. Reclassifications from AOCI are included in the gain or loss recognized on cash flow hedges (See Note 10 “ Financial Instruments, Hedging Activities and Fair Value Measurements ”).

Other Income

Other Income	12 Months Ended
	Dec. 31, 2019
Other Income and Expenses [Abstract]
Other Earnings	Other Income ($ in millions) 2019 2018 2017 Gain on sale of assets (1) $7 $33 $28 Royalty income 8 10 11 Share of net earnings of equity affiliates (See Note 6) 11 16 12 Gain on disposal of ownership interest in business affiliate — — 25 Income from a legal settlement — — 18 Other 63 55 56 Total $89 $114 $150 (1) In 2018, PPG had a $26 million gain on the sale of land near a facility of the Company’s former commodity chemicals business.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company’s stock-based compensation includes stock options, restricted stock units (“RSUs”) and grants of contingent shares that are earned based on achieving targeted levels of total shareholder return. All current grants of stock options, RSUs and contingent shares are made under the PPG Industries, Inc. Amended and Restated Omnibus Incentive Plan (“PPG Amended Omnibus Plan”), which was amended and restated effective April 21, 2016. Shares available for future grants under the PPG Amended Omnibus Plan were 6.7 million as of December 31, 2019 . ($ in millions) 2019 2018 2017 Total stock-based compensation $39 $37 $35 Income tax benefit recognized $9 $8 $12 Stock Options PPG has outstanding stock option awards that have been granted under the PPG Amended Omnibus Plan. Under the PPG Amended Omnibus Plan, certain employees of the Company have been granted options to purchase shares of common stock at prices equal to the fair market value of the shares on the date the options were granted. The options are generally exercisable 36 months after being granted and have a maximum term of 10 years. Upon exercise of a stock option, shares of Company stock are issued from treasury stock. The fair value of stock options issued to employees is measured on the date of grant and is recognized as expense, net of estimated forfeitures, over the requisite service period. PPG estimates the fair value of stock options using the Black-Scholes option pricing model. The risk-free interest rate is determined by using the U.S. Treasury yield curve at the date of the grant and using a maturity equal to the expected life of the option. The expected life of options is calculated using the average of the vesting term and the maximum term, as prescribed by accounting guidance on the use of the simplified method for determining the expected term of an employee share option. The expected dividend yield and volatility are based on historical stock prices and dividend amounts over past time periods equal in length to the expected life of the options. PPG applies an estimated forfeiture rate that is calculated based on historical activity. The following weighted average assumptions were used to calculate the fair values of stock option grants in each year: 2019 2018 2017 Weighted average exercise price $109.74 $115.98 $101.53 Risk free interest rate 2.6 % 2.9 % 2.4 % Expected life of option in years 6.5 6.5 6.5 Expected dividend yield 1.6 % 1.7 % 1.8 % Expected volatility 20.0 % 21.0 % 22.0 % The weighted average fair value of options granted was $22.50 per share, $25.27 per share and $21.15 per share for the years ended December 31, 2019 , 2018 , and 2017 , respectively. Stock Options Outstanding and Exercisable Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Life (in years) Intrinsic Value (in millions) Outstanding, January 1, 2019 3,761,000 $90.10 6.1 $61 Granted 588,870 $109.74 Exercised (832,177 ) $73.78 Forfeited/Expired (107,940 ) $107.41 Outstanding, December 31, 2019 3,409,753 $96.93 6.1 $125 Vested or expected to vest, December 31, 2019 3,312,698 $96.54 6.1 $122 Exercisable, December 31, 2019 1,819,591 $86.67 4.4 $85 At December 31, 2019 , unrecognized compensation cost related to outstanding stock options that have not yet vested totaled $7 million . This cost is expected to be recognized as expense over a weighted average period of 1.5 years. The following table presents stock option activity for the years ended December 31, 2019 , 2018 and 2017 : ($ in millions) 2019 2018 2017 Total intrinsic value of stock options exercised $38 $19 $40 Cash received from stock option exercises $61 $15 $52 Income tax benefit from the exercise of stock options $9 $4 $15 Total fair value of stock options vested $12 $10 $13 Restricted Stock Units (“RSUs”) Long-term incentive value is delivered to selected key management employees by granting RSUs, which have either time or performance-based vesting features. The fair value of an RSU is equal to the market value of a share of PPG stock on the date of grant. Time-based RSUs vest over the three -year period following the date of grant, unless forfeited, and will be paid out in the form of stock, cash or a combination of both at the Company’s discretion at the end of the three year vesting period. Performance-based RSUs vest based on achieving specific annual performance targets for earnings per share growth and cash flow return on capital over the three calendar year-end periods following the date of grant. Unless forfeited, the performance-based RSUs will be paid out in the form of stock, cash or a combination of both at the Company’s discretion at the end of the three -year performance period if PPG meets the performance targets. The amount paid for performance-based awards may range from 0% to 180% of the original grant, based upon the frequency with which the annual earnings per share growth and cash flow return on capital performance targets are met over the three calendar year periods comprising the vesting period. PPG has assumed that performance-based RSUs granted in 2017, 2018 and 2019 will vest at the 100% level. As of December 31, 2019 , three of the six possible performance targets had been met for the 2017 grant, two of the four possible performance targets had been met for the 2018 grant, and one of two possible performance targets had been met for the 2019 grant. RSU Activity Number of Shares Weighted Average Fair Value Intrinsic Value (in millions) Outstanding, January 1, 2019 631,731 $102.80 $65 Granted 241,113 $111.25 Released from restrictions (229,238 ) $100.98 Forfeited (32,064 ) $109.34 Outstanding, December 31, 2019 611,542 $109.30 $67 Vested or expected to vest, December 31, 2019 580,878 $109.17 $63 There was $17 million of total unrecognized compensation cost related to unvested RSUs outstanding as of December 31, 2019 . This cost is expected to be recognized as expense over a weighted average period of 1.7 years. Contingent Share Grants The Company also provides grants of contingent shares to selected key executives that may be earned based on PPG total shareholder return (“TSR”) over the three -year period following the date of grant. Contingent share grants (referred to as “TSR awards”) are made annually and are paid out at the end of each three -year period based on the Company’s performance. Performance is measured by determining the percentile rank of the total shareholder return of PPG common stock in relation to the total shareholder return of the S&P 500 for the three -year period following the date of grant. This comparison group represents the entire S&P 500 Index as it existed at the beginning of the performance period, excluding any companies that have been removed from the index because they ceased to be publicly traded. The payment of awards following the three -year award period will be based on performance achieved in accordance with the scale set forth in the plan agreement and may range from 0% to 220% of the initial grant. A payout of 100% is earned if the target performance is achieved. Contingent share awards for the 2017-2019, 2018-2020, and 2019-2021 periods earn dividend equivalents for the award period, which will be paid to participants or credited to the participants’ deferred compensation plan accounts with the award payout at the end of the period based on the actual number of contingent shares that are earned. Any payments made at the end of the award period may be in the form of stock, cash or a combination of both. The TSR awards qualify as liability awards, and compensation expense is recognized over the three -year award period based on the fair value of the awards (giving consideration to the Company’s percentile rank of total shareholder return) remeasured in each reporting period until settlement of the awards. As of December 31, 2019 , there was $6 million of total unrecognized compensation cost related to outstanding TSR awards based on the current estimate of fair value. This cost is expected to be recognized as expense over a weighted average period of 1.7 years.

Quarterly Financial Information

Quarterly Financial Information (unaudited)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information (unaudited)	Quarterly Financial Information (unaudited) 2019 Quarter Ended Full Year 2019 (1) ($ in millions, except per share amounts) March 31 June 30 September 30 December 31 Net sales $3,624 $4,024 $3,826 $3,672 $15,146 Cost of sales (2) 2,073 2,288 2,181 2,111 8,653 Net income (attributable to PPG) Income from continuing operations, net of tax $312 $270 $366 $295 $1,243 Income/(Loss) from discontinued operations, net of tax — 2 1 (3 ) — Net income (attributable to PPG) $312 $272 $367 $292 $1,243 Earnings per common share Income from continuing operations, net of tax $1.32 $1.14 $1.55 $1.24 $5.25 Income/(Loss) from discontinued operations, net of tax — 0.01 — (0.01 ) — Earnings per common share $1.32 $1.15 $1.55 $1.23 $5.25 Earnings per common share - assuming dilution Income from continuing operations, net of tax $1.31 $1.13 $1.54 $1.23 $5.22 Income/(Loss) from discontinued operations, net of tax — 0.01 — (0.01 ) — Earnings per common share – assuming dilution $1.31 $1.14 $1.54 $1.22 $5.22 2018 Quarter Ended Full Year 2018 (1) ($ in millions except per share amounts) March 31 June 30 September 30 December 31 Net sales $3,781 $4,131 $3,817 $3,645 $15,374 Cost of sales (2) 2,181 2,379 2,253 2,188 9,001 Net income (attributable to PPG) Income from continuing operations, net of tax $328 $371 $368 $256 $1,323 Income from discontinued operations, net of tax 6 — 10 2 18 Net income (attributable to PPG) $334 $371 $378 $258 $1,341 Earnings per common share Income from continuing operations, net of tax $1.32 $1.51 $1.52 $1.07 $5.43 Income from discontinued operations, net of tax 0.02 — 0.04 0.01 0.07 Earnings per common share $1.34 $1.51 $1.56 $1.08 $5.50 Earnings per common share - assuming dilution Income from continuing operations, net of tax $1.31 $1.51 $1.51 $1.07 $5.40 Income from discontinued operations, net of tax 0.02 — 0.04 0.01 0.07 Earnings per common share – assuming dilution $1.33 $1.51 $1.55 $1.08 $5.47 (1) Full year earnings-per-share was calculated using the full year weighted average shares outstanding. As such, the sum of the quarters may not equal the total earnings-per-share for the year. (2) Exclusive of depreciation and amortization.

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition The Company recognizes revenue when control of the promised goods or services is transferred to the customer and in amounts that the Company expects to collect. The timing of revenue recognition takes into consideration the various shipping terms applicable to the Company’s sales. For most transactions, control passes in accordance with agreed upon delivery terms. The Company delivers products to company-owned stores, home centers and other regional or national consumer retail outlets, paint dealers, concessionaires and independent distributors, company-owned distribution networks, and directly to manufacturing companies and retail customers. Each product delivered to a third party customer is considered to satisfy a performance obligation. Performance obligations generally occur at a point in time and are satisfied when control of the goods passes to the customer. The Company is entitled to collection of the sales price under normal credit terms in the regions in which it operates. Accounts receivable are recognized when there is an unconditional right to consideration. Payment terms vary from customer to customer, depending on creditworthiness, prior payment history and other considerations. The Company also provides services by applying coatings to customers' manufactured parts and assembled products and by providing technical support to certain customers. Performance obligations are satisfied over time as critical milestones are met and as services are provided. PPG is entitled to payment as the services are rendered. For the years ended December 31, 2019, 2018 and 2017, service revenue constituted approximately 5% of total revenue. Net sales by segment and region for the years ended December 31, 2019 , 2018 and 2017 were as follows: Performance Coatings Industrial Coatings Total Net Sales ($ in millions) 2019 2018 2017 2019 2018 2017 2019 2018 2017 United States and Canada $4,057 $4,062 $4,031 $2,418 $2,423 $2,276 $6,475 $6,485 $6,307 EMEA 2,869 2,936 2,761 1,680 1,742 1,628 4,549 4,678 4,389 Asia Pacific 1,095 1,071 970 1,447 1,547 1,553 2,542 2,618 2,523 Latin America 1,013 1,018 968 567 575 561 1,580 1,593 1,529 Total $9,034 $9,087 $8,730 $6,112 $6,287 $6,018 $15,146 $15,374 $14,748

Reportable Business Segment Inf

Reportable Business Segment Information	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Reportable Business Segment Information	Reportable Business Segment Information Segment Organization and Products PPG is a multinational manufacturer with 9 operating segments (which the Company refers to as “strategic business units”) that are organized based on the Company’s major products lines. The Company’s reportable business segments include the following two segments: Performance Coatings and Industrial Coatings. The operating segments have been aggregated based on economic similarities, the nature of their products, production processes, end-use markets and methods of distribution. The Performance Coatings reportable business segment is comprised of the automotive refinish coatings, aerospace coatings, architectural coatings – Americas and Asia Pacific, architectural coatings - EMEA, and protective and marine coatings operating segments. This reportable business segment primarily supplies a variety of protective and decorative coatings, sealants and finishes along with paint strippers, stains and related chemicals, as well as transparencies and transparent armor. The Industrial Coatings reportable business segment is comprised of the automotive OEM coatings, industrial coatings, packaging coatings, and the specialty coatings and materials operating segments. This reportable business segment primarily supplies a variety of protective and decorative coatings and finishes along with adhesives, sealants, metal pretreatment products, optical monomers and coatings, precipitated silicas and other specialty materials. Production facilities and sales for Performance Coatings and Industrial Coatings are global. PPG’s reportable business segments continue to pursue opportunities to further develop their global reach, including efforts in Asia, Eastern Europe and Latin America. Each of the reportable business segments in which PPG is engaged is highly competitive. The diversification of our product lines and the worldwide sales tend to minimize the impact on PPG’s Net sales and Income before income taxes in the consolidated statement of income of changes in demand in a particular industry or in a particular geographic area. The accounting policies of the operating segments are the same as those described in the summary of significant accounting policies (See Note 1 , “ Summary of Significant Accounting Policies ”). The Company allocates resources to operating segments and evaluates the performance of operating segments based upon segment income, which is income before interest expense – net, income taxes, and noncontrolling interests and excludes certain charges which are considered to be unusual or non-recurring. The Company also evaluates performance of operating segments based on working capital reduction, margin growth, and sales volume growth. Legacy items include current costs related to former operations of the Company not classified as discontinued operations at the time of the disposal, including pension and other postretirement benefit costs, certain charges for legal matters and certain environmental remediation costs, and certain other charges which are not associated with PPG’s current business portfolio. These legacy costs are excluded from the segment income that is used to evaluate the performance of the operating segments. Corporate unallocated costs include the costs of corporate staff functions not directly associated with the operating segments, certain legal cases, net of related insurance recoveries and the cost of certain insurance and stock-based compensation programs. The service cost component of net periodic pension expense related to current employees of each reportable business segment is allocated to that reportable business segment and the remaining portion of net periodic pension expense is included in the Corporate unallocated costs. Product movement between Performance Coatings and Industrial Coatings is limited, is accounted for as an inventory transfer, and is recorded at cost plus a mark-up, the impact of which is not significant to the net sales or segment income of the reportable business segments. ($ in millions) 2019 2018 2017 Net sales to external customers Performance Coatings $9,034 $9,087 $8,730 Industrial Coatings 6,112 6,287 6,018 Total Net sales $15,146 $15,374 $14,748 Segment income Performance Coatings $1,409 $1,300 $1,313 Industrial Coatings 862 818 979 Total Segment income $2,271 $2,118 $2,292 Corporate / Non-Segment Items Legacy items ($1 ) $5 ($2 ) Business restructuring-related costs, net (1) (222 ) (75 ) — Environmental remediation charges and other costs, net (61 ) (77 ) — Acquisition-related costs (2) (17 ) (6 ) (9 ) Litigation matters, net (12 ) (24 ) 18 Impairment of a non-manufacturing asset — (9 ) — Costs related to customer assortment changes — (18 ) — Gain from the sale of non-operating assets — 26 13 Brand rationalization charge — (6 ) — Asset write-downs — — (7 ) Pension settlement charge — — (60 ) Gain on disposal of ownership interest in business affiliate — — 25 Interest expense, net of interest income (100 ) (95 ) (85 ) Corporate unallocated (197 ) (146 ) (180 ) Total Income before income taxes $1,661 $1,693 $2,005 ($ in millions) 2019 2018 2017 Depreciation and amortization Performance Coatings $255 $274 $272 Industrial Coatings 194 181 164 Corporate / Non-Segment Items 62 42 24 Total $511 $497 $460 Share of net earnings of equity affiliates Performance Coatings $1 $1 $2 Industrial Coatings — — — Corporate / Non-Segment Items 10 15 10 Total $11 $16 $12 Segment assets (3) Performance Coatings $10,636 $9,846 $9,763 Industrial Coatings 4,912 4,441 4,563 Corporate / Non-Segment Items 2,160 1,728 2,212 Total $17,708 $16,015 $16,538 Investment in equity affiliates Performance Coatings $33 $33 $32 Industrial Coatings 14 13 13 Corporate / Non-Segment Items 82 86 89 Total $129 $132 $134 Expenditures for property (including business acquisitions) Performance Coatings $483 $545 $224 Industrial Coatings 510 157 328 Corporate / Non-Segment Items 63 87 133 Total $1,056 $789 $685 ($ in millions) 2019 2018 2017 Geographic Information Net sales (4) United States and Canada $6,475 $6,485 $6,307 Europe, Middle East and Africa (“EMEA”) 4,549 4,678 4,389 Asia Pacific 2,542 2,618 2,523 Latin America 1,580 1,593 1,529 Total $15,146 $15,374 $14,748 Segment income United States and Canada $1,073 $1,022 $1,135 EMEA 569 549 560 Asia Pacific 342 306 361 Latin America 287 241 236 Total $2,271 $2,118 $2,292 Property—net United States and Canada $1,300 $1,254 $1,224 EMEA 836 777 826 Asia Pacific 538 482 493 Latin America 309 292 281 Total $2,983 $2,805 $2,824 (1) Included in business restructuring-related costs, net are business restructuring charges, accelerated depreciation of certain assets and other related costs, offset by releases related to previously approved programs. (2) Acquisition-related costs include advisory, legal, accounting, valuation, and other professional or consulting fees incurred to effect acquisitions. These costs are included in Selling, general and administrative expense in the consolidated statement of income. Acquisition-related costs also include the impact for the step up to fair value of inventory acquired in certain acquisitions which are included in Cost of sales, exclusive of depreciation and amortization in the consolidated statement of income. (3) Segment assets are the total assets used in the operation of each segment. Corporate assets are principally cash and cash equivalents, cash held in escrow, short term investments and deferred tax assets. (4) Net sales to external customers are attributed to geographic regions based upon the location of the operating unit shipping the product.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Recently Adopted Accounting Standards Policy	Accounting Standards Adopted in 2019 Effective January 1, 2019, PPG adopted Accounting Standards Update (“ASU”) No. 2016-02, "Leases." This ASU requires substantially all leases be recorded on the balance sheet as right of use assets and lease obligations. PPG adopted the ASU using a retrospective adoption method at January 1, 2019, as outlined in ASU No. 2018-11, "Leases - Targeted Improvements." Under this method of adoption, there is no impact to the consolidated statement of income and consolidated balance sheet. PPG determined that there was no cumulative-effect adjustment to beginning Retained earnings on the consolidated balance sheet. PPG will continue to report periods prior to January 1, 2019 in its financial statements under prior guidance as outlined in Accounting Standards Codification Topic 840, "Leases." In addition, PPG elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed carry forward of historical lease classifications. Adoption of this standard did not materially impact PPG’s Income before income taxes and had no impact on the consolidated statement of cash flows. See Note 2, "Leases" for further details.
Allowance For Doubtful Accounts Policy	Receivables and Allowances All trade receivables are reported on the consolidated balance sheet at the outstanding principal adjusted for any allowance for credit losses and any charge offs. The Company provides an allowance for doubtful accounts to reduce receivables to their estimated net realizable value when it is probable that a loss will be incurred. Those estimates are based on historical collection experience, current economic and market conditions, a review of the aging of accounts receivable and the assessments of current creditworthiness of customers.
Lessee, Leases [Policy Text Block]	Leases The Company determines if a contract is a lease at the inception of the arrangement. The Company reviews all options to extend, terminate, or purchase its right of use assets at the inception of the lease and accounts for these options when they are reasonably certain of being exercised. Certain real estate leases contain lease and non-lease components, which are accounted for separately. For certain equipment leases, lease and non-lease components are accounted for as a single lease component. Leases with an initial term of twelve months or less are not recorded on the consolidated balance sheet. Lease expense for these leases is recognized on a straight-line basis over the lease term. Variable lease expense is based on contractual arrangements with PPG’s lessors determined based on external indices or other relevant market factors. In addition, PPG’s variable lease expense also includes elements of a contract that do not represent a good or service but for which the lessee is responsible for paying. Nearly all of PPG’s lease contracts do not provide a readily determinable implicit rate. For these contracts, PPG’s estimated incremental borrowing rate is based on information available at the inception of the lease.
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include the accounts of PPG Industries, Inc. (“PPG” or the “Company”) and all subsidiaries, both U.S. and non-U.S., that it controls. PPG owns more than 50% of the voting stock of most of the subsidiaries that it controls. For those consolidated subsidiaries in which the Company’s ownership is less than 100% , the outside shareholders’ interests are shown as noncontrolling interests. Investments in companies in which PPG owns 20% to 50% of the voting stock and has the ability to exercise significant influence over operating and financial policies of the investee are accounted for using the equity method of accounting. As a result, PPG’s share of income or losses from such equity affiliates is included in the consolidated statement of income and PPG’s share of these companies’ shareholders’ equity is included in Investments on the consolidated balance sheet. Transactions between PPG and its subsidiaries are eliminated in consolidation.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements
Revenue Recognition	Revenue Recognition Revenue is recognized as performance obligations with the customer are satisfied, at an amount that is determined to be collectible. For the sale of products, this generally occurs at the point in time when control of the Company’s products transfers to the customer based on the agreed upon shipping terms. Shipping and Handling Costs Amounts billed to customers for shipping and handling are reported in Net sales in the consolidated statement of income. Shipping and handling costs incurred by the Company for the delivery of goods to customers are included in Cost of sales, exclusive of depreciation and amortization in the consolidated statement of income. The Company recognizes revenue when control of the promised goods or services is transferred to the customer and in amounts that the Company expects to collect. The timing of revenue recognition takes into consideration the various shipping terms applicable to the Company’s sales. For most transactions, control passes in accordance with agreed upon delivery terms. The Company delivers products to company-owned stores, home centers and other regional or national consumer retail outlets, paint dealers, concessionaires and independent distributors, company-owned distribution networks, and directly to manufacturing companies and retail customers. Each product delivered to a third party customer is considered to satisfy a performance obligation. Performance obligations generally occur at a point in time and are satisfied when control of the goods passes to the customer. The Company is entitled to collection of the sales price under normal credit terms in the regions in which it operates. Accounts receivable are recognized when there is an unconditional right to consideration. Payment terms vary from customer to customer, depending on creditworthiness, prior payment history and other considerations. The Company also provides services by applying coatings to customers' manufactured parts and assembled products and by providing technical support to certain customers. Performance obligations are satisfied over time as critical milestones
Selling, General and Administrative Costs	Selling, General and Administrative Costs Amounts presented in Selling, general and administrative in the consolidated statement of income are comprised of selling, customer service, distribution and advertising costs, as well as the costs of providing corporate-wide functional support in such areas as finance, law, human resources and planning. Distribution costs pertain to the movement and storage of finished goods inventory at company-owned and leased warehouses and other distribution facilities.
Advertising Costs, Policy	Advertising Costs
Research and Development Expense, Policy	Research and Development Research and development costs, which consist primarily of employee related costs, are charged to expense as incurred.
Legal Costs	Legal Costs Legal costs, which primarily include costs associated with acquisition and divestiture transactions, general litigation, environmental regulation compliance, patent and trademark protection and other general corporate purposes, are charged to expense as incurred.
Income Tax, Policy [Policy Text Block]	Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to operating losses and tax credit carryforwards as well as differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in Income tax expense in the consolidated statement of income in the period that includes the enactment date. A valuation allowance will be provided against deferred tax assets if PPG determines it is more likely than not such assets will not ultimately be realized. PPG does not recognize a tax benefit unless it concludes that it is more likely than not that the benefit will be sustained on audit by the taxing authority based solely on the technical merits of the associated tax position. If the recognition threshold is met, PPG recognizes a tax benefit measured at the largest amount of the tax benefit that, in PPG’s judgment, is greater than 50 percent likely to be realized. PPG records interest and penalties related to uncertain tax positions in Income tax expense in the consolidated statement of income.
Foreign Currency Translation	Foreign Currency Translation The functional currency of most significant non-U.S. operations is their local currency. Assets and liabilities of those operations are translated into U.S. dollars using year-end exchange rates; income and expenses are translated using the average exchange rates for the reporting period. Unrealized foreign currency translation gains and losses are deferred in Accumulated other comprehensive loss on the consolidated balance sheet.
Cash Equivalents	Cash Equivalents Cash equivalents are highly liquid investments (valued at cost, which approximates fair value) acquired with an original maturity of three months or less.
Short-term Investments	Short-term Investments Short-term investments are highly liquid, high credit quality investments (valued at cost plus accrued interest) that have stated maturities of greater than three months to less than one year. The purchases and sales of these investments are classified as Investing activities in the consolidated statement of cash flows.
Marketable Equity Securities	Marketable Equity Securities The Company’s investment in marketable equity securities is recorded at fair market value and reported as Other current assets and Investments on the consolidated balance sheet with changes in fair market value recorded in income.
Inventories	Inventories Inventories are stated at the lower of cost or net realizable value. Most U.S. inventories are stated at cost, using the last-in, first-out (“LIFO”) method of accounting, which does not exceed net realizable value. All other inventories are stated at cost, using the first-in, first-out (“FIFO”) method of accounting, which does not exceed net realizable value. PPG determines cost using either average or standard factory costs, which approximate actual costs, excluding certain fixed costs such as depreciation and property taxes. See Note 4 , “ Working Capital Detail ” for further information concerning the Company’s inventory.
Derivatives, Policy	Derivative Financial Instruments
Property	Property, Plant and Equipment Property, plant and equipment is recorded at cost. Depreciation is computed on a straight-line method based on the estimated useful lives of related assets. Additional depreciation expense is recorded when facilities or equipment are subject to abnormal economic conditions, restructuring actions or obsolescence. The cost of significant improvements that add to productive capacity or extend the lives of properties are capitalized. Costs for repairs and maintenance are charged to expense as incurred. When a capitalized asset is retired or otherwise disposed of, the original cost and related accumulated depreciation balance are removed from the accounts and any related gain or loss is recorded in Income before income taxes in the consolidated statement of income. The amortization cost of finance lease assets are recorded in Depreciation expense in the consolidated statement of income. Property and other long-lived assets are reviewed for impairment whenever events or circumstances indicate that their carrying amounts may not be recoverable. See Note 5 , “ Property, Plant and Equipment
Goodwill and Identifiable Intangible Assets	Goodwill and Identifiable Intangible Assets Goodwill represents the excess of the cost over the fair value of acquired identifiable tangible and intangible assets less liabilities assumed from acquired businesses. Identifiable intangible assets acquired in business combinations are recorded based upon their fair value at the date of acquisition. PPG is a multinational manufacturer with 9 operating segments (which the Company refers to as “strategic business units”) that are organized based on the Company’s major products lines. These operating segments are also the Company’s reporting units for purposes of testing goodwill for impairment, which is tested at least annually in connection with PPG’s strategic planning process or more frequently if an indication of impairment exists. The Company tests goodwill for impairment by either performing a qualitative evaluation or a quantitative test. The qualitative evaluation is an assessment of factors, including reporting unit specific operating results as well as industry, market and general economic conditions, to determine whether it is more likely than not that the fair values of a reporting unit is less than its carrying amount, including goodwill. The Company may elect to bypass this qualitative assessment for some or all of its reporting units and perform a quantitative test. Quantitative goodwill impairment testing is performed during the fourth quarter of each year by comparing the estimated fair value of an associated reporting unit as of September 30 to its carrying value. Fair value is estimated using a discounted cash flow model. Key assumptions and estimates used in the discounted cash flow model include projected future revenues, discount rates, operating cash flows, capital expenditures and tax rates. In 2019, the annual impairment testing review of goodwill did not result in impairment of the Company’s reporting units. The Company has determined that certain acquired trademarks have indefinite useful lives. The Company tests the carrying value of these trademarks for impairment at least annually, or as needed whenever events and circumstances indicate that their carrying amount may not be recoverable. The annual assessment takes place in the fourth quarter of each year either by completing a qualitative assessment or quantitatively by comparing the estimated fair value of each trademark as of September 30 to its carrying value. Fair value is estimated by using the relief from royalty method (a discounted cash flow methodology). The qualitative assessment includes consideration of factors, including revenue relative to the asset being assessed, the operating results of the related business as well as industry, market and general economic conditions, to determine whether it is more likely than not that the fair value of the asset is less than its carrying amount. In 2019, the annual impairment testing review of indefinite-lived intangibles did not result in an impairment. Identifiable intangible assets with finite lives are amortized on a straight-line basis over their estimated useful lives ( 1 to 30 years) and are reviewed for impairment whenever events or circumstances indicate that their carrying amount may not be recoverable.
Product Warranties	Product warranties The Company accrues for product warranties at the time the associated products are sold based on historical claims experience. The reserve, pretax charges against income and cash outlays for product warranties were not significant to the consolidated financial statements of the Company for any year presented.
Asset Retirement Obligations	Asset Retirement Obligations An asset retirement obligation represents a legal obligation associated with the retirement of a tangible long-lived asset that is incurred upon the acquisition, construction, development or normal operation of that long-lived asset. PPG recognizes asset retirement obligations in the period in which they are incurred, if a reasonable estimate of fair value can be made. The asset retirement obligation is subsequently adjusted for changes in fair value. The associated estimated asset retirement costs are capitalized as part of the carrying amount of the long-lived asset and depreciated over its useful life. PPG’s asset retirement obligations are primarily associated with the retirement or closure of certain assets used in PPG’s manufacturing process. The accrued asset retirement obligation is recorded in Accounts payable and accrued liabilities and Other liabilities on the consolidated balance sheet, and was $21 million and $22 million as of December 31, 2019 and 2018 , respectively. PPG’s only conditional asset retirement obligation relates to the possible future abatement of asbestos contained in certain PPG production facilities. The asbestos in PPG’s production facilities arises from the application of normal and customary building practices in the past when the facilities were constructed. This asbestos is encapsulated in place and, as a result, there is no current legal requirement to abate it. Because there is no requirement to abate, the Company does not have any current plans or an intention to abate and therefore the timing, method and cost of future abatement, if any, are not known. The Company has not recorded an asset retirement obligation associated with asbestos abatement, given the uncertainty concerning the timing of future abatement, if any.
Accounting Standard to be Adopted in Future Years	Accounting Standards to be Adopted in Future Years In August 2018, the Financial Accounting Standards Board ("FASB") issued ASU No. 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software." This ASU requires capitalization of certain implementation costs incurred in a cloud computing arrangement that is a service contract. PPG adopted the new standard effective January 1, 2020. PPG is nearly complete in the assessment and implementation of this ASU and does not believe this ASU will have a material impact on its consolidated financial position, results of operations or cash flows. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses.” This ASU requires an organization to measure all expected credit losses for financial assets, including trade receivables, held at the reporting date based on historical experience, current conditions, and reasonable and supportable information. Financial institutions and other organizations will now use forward-looking information to better estimate their credit losses. PPG adopted the new standard effective January 1, 2020. PPG is nearly complete in its assessment of this ASU and has updated its internal controls and operational processes and procedures to include certain forward looking considerations in its current process of developing and recognizing credit losses for its financial assets accounted for at amortized cost. PPG is nearly complete in the assessment and implementation of this ASU and does not believe this ASU will have a material impact on its consolidated financial position, results of operations or cash flows.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	Leases PPG leases certain retail paint stores, warehouses, distribution facilities, office space, fleet vehicles and equipment. The components of lease expense for the year ended December 31, 2019 were as follows: ($ in millions) Classification in the Consolidated Statement of Income 2019 Operating lease cost Cost of sales, exclusive of depreciation and amortization $34 Operating lease cost Selling, general and administrative 198 Total operating lease cost $232 Finance lease cost: Amortization of right-of-use assets Depreciation $2 Interest on lease liabilities Interest expense 1 Total finance lease cost $3 Total lease cost $235 Lease expense for operating leases was $289 million and $288 million in 2018 and 2017, respectively. Total operating lease cost for the year ended December 31, 2019 is inclusive of the following: ($ in millions) 2019 Variable lease costs $15 Short-term lease costs $5 ($ in millions) Classification on the Consolidated Balance Sheet 2019 Assets: Operating Operating lease right-of-use assets $782 Finance (a) Property, plant, and equipment, net 17 Total leased assets $799 Liabilities: Current Operating Current portion of operating lease liabilities $170 Finance Short-term debt and current portion of long-term debt 3 Noncurrent Operating Operating lease liabilities $622 Finance Long-term debt 8 Total lease liabilities $803 (a) Net of accumulated depreciation of $11 million . ($ in millions) 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows paid for operating leases $210 Operating cash flows paid for finance leases $1 Financing cash flows paid for finance leases $4 Right-of-use assets obtained in exchange for lease obligations: Operating leases $219 Finance leases $1 2019 Weighted-average remaining lease term (in years) Operating leases 7.4 Finance leases 6.2 Weighted-average discount rate Operating leases 3.0 % Finance leases 9.4 % As of December 31, 2019 , maturities of lease liabilities were as follows: ($ in millions) Operating Leases Finance Leases 2020 $191 $3 2021 150 2 2022 118 2 2023 92 2 2024 72 1 Thereafter 266 3 Total lease payments $889 $13 Less: Interest 97 2 Total lease obligations $792 $11 Disclosures related to periods prior to adoption of ASU 2016-02 PPG adopted ASU 2016-02 using a retrospective adoption method at January 1, 2019 as noted in Note 1 , " Summary of Significant Accounting Policies ." As required, the following disclosure is provided for periods prior to adoption. Minimum lease commitments as of December 31, 2018 that have initial or remaining lease terms in excess of one year are as follows: ($ in millions) Operating Leases Capital Leases 2019 $207 $3 2020 $157 $3 2021 $116 $1 2022 $93 $1 2023 $76 $1 Beyond 2023 $244 $3
Schedule of Components of Lease Expense	The components of lease expense for the year ended December 31, 2019 were as follows: ($ in millions) Classification in the Consolidated Statement of Income 2019 Operating lease cost Cost of sales, exclusive of depreciation and amortization $34 Operating lease cost Selling, general and administrative 198 Total operating lease cost $232 Finance lease cost: Amortization of right-of-use assets Depreciation $2 Interest on lease liabilities Interest expense 1 Total finance lease cost $3 Total lease cost $235 Total operating lease cost for the year ended December 31, 2019 is inclusive of the following: ($ in millions) 2019 Variable lease costs $15 Short-term lease costs $5
Schedule of Classification on the Condensed Consolidated Balance Sheet	($ in millions) Classification on the Consolidated Balance Sheet 2019 Assets: Operating Operating lease right-of-use assets $782 Finance (a) Property, plant, and equipment, net 17 Total leased assets $799 Liabilities: Current Operating Current portion of operating lease liabilities $170 Finance Short-term debt and current portion of long-term debt 3 Noncurrent Operating Operating lease liabilities $622 Finance Long-term debt 8 Total lease liabilities $803 (a) Net of accumulated depreciation of $11 million .
Schedule of Cash Paid for Lease Liabilities and Right-of-Use Assets Obtained in Exchange for Lease Obligations	($ in millions) 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows paid for operating leases $210 Operating cash flows paid for finance leases $1 Financing cash flows paid for finance leases $4 Right-of-use assets obtained in exchange for lease obligations: Operating leases $219 Finance leases $1
Schedule of Weighted-Average Remaining Lease Term and Weighted-Average Discount Rate	2019 Weighted-average remaining lease term (in years) Operating leases 7.4 Finance leases 6.2 Weighted-average discount rate Operating leases 3.0 % Finance leases 9.4 %
Schedule of Maturities of Lease Liabilities, Operating Lease	As of December 31, 2019 , maturities of lease liabilities were as follows: ($ in millions) Operating Leases Finance Leases 2020 $191 $3 2021 150 2 2022 118 2 2023 92 2 2024 72 1 Thereafter 266 3 Total lease payments $889 $13 Less: Interest 97 2 Total lease obligations $792 $11
Schedule of Maturities of Lease Liabilities, Finance Lease	As of December 31, 2019 , maturities of lease liabilities were as follows: ($ in millions) Operating Leases Finance Leases 2020 $191 $3 2021 150 2 2022 118 2 2023 92 2 2024 72 1 Thereafter 266 3 Total lease payments $889 $13 Less: Interest 97 2 Total lease obligations $792 $11
Schedule of Future Minimum Rental Payments for Operating Leases	Minimum lease commitments as of December 31, 2018 that have initial or remaining lease terms in excess of one year are as follows: ($ in millions) Operating Leases Capital Leases 2019 $207 $3 2020 $157 $3 2021 $116 $1 2022 $93 $1 2023 $76 $1 Beyond 2023 $244 $3
Schedule of Future Minimum Lease Payments for Capital Leases	Minimum lease commitments as of December 31, 2018 that have initial or remaining lease terms in excess of one year are as follows: ($ in millions) Operating Leases Capital Leases 2019 $207 $3 2020 $157 $3 2021 $116 $1 2022 $93 $1 2023 $76 $1 Beyond 2023 $244 $3

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
Research and Development	($ in millions) 2019 2018 2017 Research and development – total $456 $464 $472 Less depreciation on research facilities 24 23 21 Research and development, net $432 $441 $451

Acquisitions and Dispositions (

Acquisitions and Dispositions (Tables)	12 Months Ended
	Dec. 31, 2019
Glass Segment
Business Acquisition [Line Items]
Disposal Groups, Including Discontinued Operations	The net sales and income from discontinued operations related to the former Glass segment for the three years ended December 31, 2019 , 2018 , and 2017 were as follows: ($ in millions) 2019 2018 2017 Net sales $— $— $217 Income from operations $3 $21 $30 Net gains on the divestitures of businesses — — 343 Income tax expense 1 5 140 Income from discontinued operations, net of tax $2 $16 $233 During 2018, PPG released $13 million of previously recorded accruals and contingencies established in conjunction with the divestitures of businesses within the former Glass segment as a result of completed actions, new information and updated estimates. Also during 2018, PPG made a final payment of $20 million to Vitro S.A.B. de C.V related to the transfer of certain pension obligations upon the sale of the former flat glass business. North American Fiber Glass Business On September 1, 2017, PPG completed the sale of its North American fiber glass business to Nippon Electric Glass Co. Ltd. (“NEG”). Cash proceeds from the sale were $541 million , resulting in a pretax gain of $343 million , net of certain accruals and contingencies established in conjunction with the divestiture. PPG’s fiber glass operations included manufacturing facilities in Chester, South Carolina, and Lexington and Shelby, North Carolina; and administrative and research-and-development operations in Shelby and in Harmar, Pennsylvania, near Pittsburgh. The business supplies the transportation, energy, infrastructure and consumer markets.

Working Capital Detail (Tables)

Working Capital Detail (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure Components Of Working Capital Detail [Abstract]
Components of Working Capital Detail	Working Capital Detail ($ in millions) 2019 2018 Receivables Trade - net (1) $2,479 $2,505 Equity affiliates 3 4 Other - net 274 336 Total $2,756 $2,845 Inventories (2) Finished products $1,047 $1,105 Work in process 197 193 Raw materials 431 452 Supplies 35 33 Total $1,710 $1,783 Accounts payable and accrued liabilities Trade $2,098 $2,177 Accrued payroll 455 424 Customer rebates 280 283 Other postretirement and pension benefits 85 80 Income taxes 46 112 Other 532 547 Total $3,496 $3,623 (1) Allowance for doubtful accounts was $22 million and $24 million as of December 31, 2019 and 2018 , respectively. (2) Inventories valued using the LIFO method of inventory valuation comprised 34% and 36% of total gross inventory values as of December 31, 2019 and 2018 , respectively. If the FIFO method of inventory valuation had been used, inventories would have been $124 million and $113 million higher as of December 31, 2019 and 2018 , respectively. During the years ended December 31, 2019 and 2018 , certain inventories accounted for on the LIFO method of accounting were reduced, which resulted in the liquidation of certain quantities carried at costs prevailing in prior years. The effect on Income before income taxes was income of $1 million and $2 million for the years ended December 31, 2019 and 2018 , respectively.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	($ in millions) Useful Lives (years) 2019 2018 Land and land improvements 1-30 $511 $489 Buildings 20-40 1,573 1,472 Machinery and equipment 5-25 3,575 3,387 Other 3-20 1,092 989 Construction in progress 314 296 Total (1) $7,065 $6,633 Less: accumulated depreciation 4,082 3,828 Net $2,983 $2,805 (1) Interest capitalized in 2019 , 2018 and 2017 was $6 million , $4 million and $7 million , respectively.

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Investments	($ in millions) 2019 2018 Investments in equity affiliates $129 $132 Marketable equity securities (See Note 10) 80 69 Other 49 50 Total $258 $251

Goodwill and Other Identifiab_2

Goodwill and Other Identifiable Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Carrying Amount of Goodwill Attributable to Each Reportable Segment	Goodwill ($ in millions) Performance Coatings Industrial Coatings Total January 1, 2018 $3,104 $838 $3,942 Acquisitions, including purchase accounting adjustments 248 (13 ) 235 Foreign currency impact (86 ) (21 ) (107 ) December 31, 2018 $3,266 $804 $4,070 Acquisitions, including purchase accounting adjustments 166 230 396 Foreign currency impact 10 (6 ) 4 December 31, 2019 $3,442 $1,028 $4,470
Identifiable Intangible Assets with Finite Lives	Identifiable Intangible Assets December 31, 2019 December 31, 2018 ($ in millions) Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net Indefinite-Lived Identifiable Intangible Assets Trademarks $1,167 $— $1,167 $1,140 $— $1,140 Definite-Lived Identifiable Intangible Assets Acquired technology $710 ($549 ) $161 $648 ($515 ) $133 Customer-related 1,578 (885 ) 693 1,396 (798 ) 598 Trade names 210 (111 ) 99 190 (96 ) 94 Other 51 (40 ) 11 44 (37 ) 7 Total Definite Lived Intangible Assets $2,549 ($1,585 ) $964 $2,278 ($1,446 ) $832 Total Identifiable Intangible Assets $3,716 ($1,585 ) $2,131 $3,418 ($1,446 ) $1,972 The Company’s identifiable intangible assets with definite lives are being amortized over their estimated useful lives. Aggregate amortization expense was $136 million , $143 million and $129 million in 2019 , 2018 and 2017 , respectively. ($ in millions) 2020 2021 2022 2023 2024 Estimated future amortization expense $135 $120 $115 $105 $85

Business Restructuring (Tables)

Business Restructuring (Tables)	12 Months Ended
	Dec. 31, 2019
Restructuring and Related Activities [Abstract]
Activity Related to Restructuring Reserves	Restructuring Reserve Activity ($ in millions) Total Reserve December 31, 2017 $102 Total 2018 restructuring charge 83 Additional actions approved 32 Release of prior reserves and other adjustments (49 ) Cash payments (66 ) Foreign currency impact (4 ) Other 12 December 31, 2018 $110 2019 restructuring charges 194 Release of prior reserves and other adjustments (18 ) Cash payments (58 ) Foreign currency impact (4 ) December 31, 2019 $224

Borrowings and Lines of Credit

Borrowings and Lines of Credit (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Long-term Debt Obligations ($ in millions) Maturity Date 2019 2018 0.00% note (€300) 2019 $— $343 2.3% notes 2019 — 299 3.6% notes 2020 499 498 9% non-callable debentures (1) 2021 134 133 0.875% notes (€600) 2022 671 685 3.2% notes ($300) (2) 2023 298 298 2.4% notes ($300) 2024 297 — 0.875% note (€600) 2025 665 679 1.4% notes (€600) 2027 665 679 3.75% notes ($700) (3) 2028 695 694 2.5% note (€80) 2029 88 91 2.8% notes ($300) 2029 297 — 7.70% notes 2038 174 174 5.5% notes 2040 247 247 3% note (€120) 2044 127 131 Commercial paper Various 100 — Various other non-U.S. debt (4) Various 38 39 Finance lease obligations Various 11 12 Impact of derivatives on debt (1)(5) N/A 36 10 Total $5,042 $5,012 Less payments due within one year N/A 503 647 Long-term debt $4,539 $4,365 (1) PPG entered into several interest rate swaps, which were subsequently settled in prior periods. The impact of these settlements are being amortized over the remaining life of the debentures as a reduction to interest expense. The weighted average interest rate for these borrowings was 8.4% for the years ended December 31, 2019 and 2018 . (2) In February 2018, PPG entered into interest rate swaps which converted $150 million of the notes from a fixed interest rate to a floating interest rate based on the three month London Interbank Offered Rate (LIBOR). The impact of the derivative on the notes represents the fair value adjustment of the debt. The average effective interest rate for the portion of the notes impacted by the swaps was 2.9% and 2.7% as of December 31, 2019 and 2018 , respectively. Refer to Note 10 , “ Financial Instruments, Hedging Activities and Fair Value Measurements ” for additional information. (3) In February 2018, PPG entered into interest rate swaps which converted $375 million of the notes from a fixed interest rate to a floating interest rate based on the three month LIBOR. The impact of the derivative on the notes represents the fair value adjustment of the debt. The average effective interest rate for the portion of the notes impacted by the swaps was 3.3% and 3.2% as of December 31, 2019 and 2018 , respectively. Refer to Note 10 , “ Financial Instruments, Hedging Activities and Fair Value Measurements ” for additional information. (4) Weighted average interest rate of 3.7% and 3.8% as of December 31, 2019 and 2018 , respectively. Long-Term Debt ($ in millions) December 31, 2019 (a) December 31, 2018 (b) Long-term debt - carrying value $5,031 $5,000 Long-term debt - fair value $5,363 $5,101 (a) Excluding finance lease obligations of $11 million and short term borrowings of $10 million as of December 31, 2019 . (b) Excluding capital lease obligations of $12 million and short term borrowings of $4 million as of December 31, 2018 .
Schedule of Maturities of Long-term Debt	-term Debt Maturities ($ in millions) Maturity per year 2020 $503 2021 $166 2022 $669 2023 $302 2024 $396 Thereafter $3,006
Short-Term Debt Outstanding	t-term Debt Obligations ($ in millions) 2019 2018 Various, weighted average 3.6% and 3.4% as of December 31, 2019 and 2018, respectively. $10 $4

Financial Instruments, Hedgin_2

Financial Instruments, Hedging Activities and Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value, Cash Flow and Net Investment Hedges	The following table summarizes the location within the consolidated financial statements and amount of gains/(losses) related to derivative and debt financial instruments for the years ended December 31, 2019 , 2018 and 2017 . All dollar amounts are shown on a pretax basis. 2019 2018 2017 Caption in Consolidated Statement of Income ($ in millions) Gain Deferred in AOCL Gain/(Loss) Recognized (Loss)/Gain Deferred in AOCL Gain/(Loss) Recognized Loss Deferred in AOCL Gain Recognized Fair Value Interest rate Swaps $3 $3 $— Interest expense Total Fair Value $3 $3 $— Cash Flow Foreign currency forward contracts $2 ($3 ) ($9 ) ($8 ) ($7 ) $9 Other charges and Cost of sales Total Cash Flow $2 ($3 ) ($9 ) ($8 ) ($7 ) $9 Net Investment Cross currency swaps $13 $18 $21 $13 ($61 ) $— Interest expense Foreign denominated debt 61 — 124 — (403 ) — Total Net Investment $74 $18 $145 $13 ($464 ) $— Economic Foreign currency forward contracts $55 $55 $14 Other charges
Schedule of Derivative Liabilities at Fair Value	Assets and liabilities reported at fair value on a recurring basis December 31, 2019 December 31, 2018 ($ in millions) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Assets: Other current assets: Marketable equity securities $5 $— $— $4 $— $— Foreign currency forward contracts (a) — 14 — — 45 — Other assets: Cross currency swaps (b) $— $52 $— $— $35 $— Interest rate swaps (c) — 35 — — 8 — Investments: Marketable equity securities $80 $— $— $69 $— $— Liabilities: Accounts payable and accrued liabilities: Foreign currency forward contracts (d) $— $1 $— $— $1 $— Foreign currency forward contracts (a) — 20 — — 9 — Other liabilities: Cross currency swap (b) $— $4 $— $— $— $—
Schedule of Long-term Debt Instruments	Long-term Debt Obligations ($ in millions) Maturity Date 2019 2018 0.00% note (€300) 2019 $— $343 2.3% notes 2019 — 299 3.6% notes 2020 499 498 9% non-callable debentures (1) 2021 134 133 0.875% notes (€600) 2022 671 685 3.2% notes ($300) (2) 2023 298 298 2.4% notes ($300) 2024 297 — 0.875% note (€600) 2025 665 679 1.4% notes (€600) 2027 665 679 3.75% notes ($700) (3) 2028 695 694 2.5% note (€80) 2029 88 91 2.8% notes ($300) 2029 297 — 7.70% notes 2038 174 174 5.5% notes 2040 247 247 3% note (€120) 2044 127 131 Commercial paper Various 100 — Various other non-U.S. debt (4) Various 38 39 Finance lease obligations Various 11 12 Impact of derivatives on debt (1)(5) N/A 36 10 Total $5,042 $5,012 Less payments due within one year N/A 503 647 Long-term debt $4,539 $4,365 (1) PPG entered into several interest rate swaps, which were subsequently settled in prior periods. The impact of these settlements are being amortized over the remaining life of the debentures as a reduction to interest expense. The weighted average interest rate for these borrowings was 8.4% for the years ended December 31, 2019 and 2018 . (2) In February 2018, PPG entered into interest rate swaps which converted $150 million of the notes from a fixed interest rate to a floating interest rate based on the three month London Interbank Offered Rate (LIBOR). The impact of the derivative on the notes represents the fair value adjustment of the debt. The average effective interest rate for the portion of the notes impacted by the swaps was 2.9% and 2.7% as of December 31, 2019 and 2018 , respectively. Refer to Note 10 , “ Financial Instruments, Hedging Activities and Fair Value Measurements ” for additional information. (3) In February 2018, PPG entered into interest rate swaps which converted $375 million of the notes from a fixed interest rate to a floating interest rate based on the three month LIBOR. The impact of the derivative on the notes represents the fair value adjustment of the debt. The average effective interest rate for the portion of the notes impacted by the swaps was 3.3% and 3.2% as of December 31, 2019 and 2018 , respectively. Refer to Note 10 , “ Financial Instruments, Hedging Activities and Fair Value Measurements ” for additional information. (4) Weighted average interest rate of 3.7% and 3.8% as of December 31, 2019 and 2018 , respectively. Long-Term Debt ($ in millions) December 31, 2019 (a) December 31, 2018 (b) Long-term debt - carrying value $5,031 $5,000 Long-term debt - fair value $5,363 $5,101 (a) Excluding finance lease obligations of $11 million and short term borrowings of $10 million as of December 31, 2019 . (b) Excluding capital lease obligations of $12 million and short term borrowings of $4 million as of December 31, 2018 .

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Common Share Calculations	($ in millions, except per share amounts) 2019 2018 2017 Earnings per common share (attributable to PPG) Income from continuing operations, net of tax $1,243 $1,323 $1,369 Income from discontinued operations, net of tax — 18 225 Net income (attributable to PPG) $1,243 $1,341 $1,594 Weighted average common shares outstanding 236.9 243.9 256.1 Effect of dilutive securities: Stock options 0.6 0.8 0.9 Other stock compensation plans 0.7 0.7 0.8 Potentially dilutive common shares 1.3 1.5 1.7 Adjusted weighted average common shares outstanding 238.2 245.4 257.8 Earnings per common share (attributable to PPG): Income from continuing operations, net of tax $5.25 $5.43 $5.34 Income from discontinued operations, net of tax — 0.07 0.88 Net income (attributable to PPG) $5.25 $5.50 $6.22 Earnings per common share - assuming dilution (attributable to PPG) Income from continuing operations, net of tax $5.22 $5.40 $5.31 Income from discontinued operations, net of tax — 0.07 0.87 Net income (attributable to PPG) $5.22 $5.47 $6.18

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Components of Income Tax Expense	The provision for income taxes by taxing jurisdiction and by significant components consisted of the following: ($ in millions) 2019 2018 2017 Current U.S. federal $86 $7 $179 U.S. state and local 15 4 49 Foreign 296 297 349 Total current income tax expense $397 $308 $577 Deferred U.S. federal ($1 ) $44 $107 U.S. state and local 13 7 (16 ) Foreign (17 ) (6 ) (53 ) Total deferred income tax expense ($5 ) $45 $38 Total income tax expense $392 $353 $615
Reconciliation of Statutory U.S. Corporate Federal Income Tax Rate to Effective Income Tax Rate	A reconciliation of the statutory U.S. corporate federal income tax rate to the Company’s effective tax rate follows: 2019 2018 2017 U.S. federal income tax rate 21.0 % 21.0 % 35.0 % Changes in rate due to: U.S. tax cost/(benefit) - Tax Cuts & Jobs Act 0.3 (2.5 ) 11.0 U.S./foreign tax differential 2.9 3.3 (9.3 ) U.S. current tax benefit on foreign exchange realization — — (4.9 ) U.S. tax incentives (0.7 ) (1.0 ) (2.3 ) U.S. tax benefit on foreign dividends (0.9 ) (0.4 ) (1.9 ) U.S. state and local taxes 1.3 0.5 1.1 U.S. deferred tax benefit on foreign income — — (0.6 ) Other (0.3 ) — 2.6 Effective income tax rate 23.6 % 20.9 % 30.7 %
Net deferred income tax assets and liabilities	($ in millions) 2019 2018 Deferred income tax assets related to Employee benefits $382 $366 Contingent and accrued liabilities 148 149 Operating loss and other carry-forwards 225 251 Inventories 4 7 Other 87 82 Valuation allowance (158 ) (164 ) Total $688 $691 Deferred income tax liabilities related to Property $277 $262 Intangibles 594 545 Employee benefits 65 46 Other 2 15 Total $938 $868 Deferred income tax liabilities – net ($250 ) ($177 )
Summary of Operating Loss Carryforwards	($ in millions) 2019 2018 Expiration Available net operating loss carryforwards, Tax Effected: Indefinite expiration $157 $124 NA Definite expiration 25 68 2020 - 2039 Total $182 $192 NA Income tax credit carryforwards $59 $61 2020 - 2039
Unrecognized Tax Benefits	Interest and penalties ($ in millions) 2019 2018 2017 Accrued interest and penalties related to unrecognized tax benefits $17 $16 $15 Loss recognized in income tax expense related to interest and penalties $1 $2 $4 A reconciliation of the total amounts of unrecognized tax benefits (excluding interest and penalties) as of December 31 follows: ($ in millions) 2019 2018 2017 January 1 $166 $148 $94 Current year tax positions - additions 25 36 37 Prior year tax positions - additions 4 17 26 Prior year tax positions - reductions (9 ) (6 ) — Statute of limitations expirations (6 ) (9 ) (8 ) Settlements (12 ) (15 ) (10 ) Foreign currency translation (1 ) (5 ) 9 December 31 $167 $166 $148

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Changes in Projected Benefit Obligations, Plan Assets and Funded Status	The following table sets forth the changes in projected benefit obligations (“PBO”) (as calculated as of December 31), plan assets, the funded status and the amounts recognized on the accompanying consolidated balance sheet for the Company’s defined benefit pension and other postretirement benefit plans: Defined Benefit Pension Plans United States International Total PPG ($ in millions) 2019 2018 2019 2018 2019 2018 Projected benefit obligation, January 1 $1,582 $1,706 $1,518 $1,756 $3,100 $3,462 Service cost 13 17 10 11 23 28 Interest cost 64 57 41 40 105 97 Actuarial losses (gains) - net 263 (129 ) 186 (117 ) 449 (246 ) Benefits paid (80 ) (70 ) (64 ) (55 ) (144 ) (125 ) Plan transfers — — — (8 ) — (8 ) Foreign currency translation adjustments — — 34 (88 ) 34 (88 ) Settlements and curtailments — — (4 ) (24 ) (4 ) (24 ) Other — 1 (2 ) 3 (2 ) 4 Projected benefit obligation, December 31 $1,842 $1,582 $1,719 $1,518 $3,561 $3,100 Market value of plan assets, January 1 $1,140 $1,196 $1,478 $1,687 $2,618 $2,883 Actual return on plan assets 219 (82 ) 190 (53 ) 409 (135 ) Company contributions — 75 13 24 13 99 Benefits paid (55 ) (49 ) (56 ) (53 ) (111 ) (102 ) Plan settlements — — (4 ) (24 ) (4 ) (24 ) Foreign currency translation adjustments — — 42 (95 ) 42 (95 ) Other — — (2 ) (8 ) (2 ) (8 ) Market value of plan assets, December 31 $1,304 $1,140 $1,661 $1,478 $2,965 $2,618 Funded Status ($538 ) ($442 ) ($58 ) ($40 ) ($596 ) ($482 ) Amounts recognized in the Consolidated Balance Sheet: Other assets (long-term) — — 183 189 183 189 Accounts payable and accrued liabilities (26 ) (18 ) (8 ) (8 ) (34 ) (26 ) Accrued pensions (512 ) (424 ) (233 ) (221 ) (745 ) (645 ) Net liability recognized ($538 ) ($442 ) ($58 ) ($40 ) ($596 ) ($482 ) Other Postretirement Benefit Plans United States International Total PPG ($ in millions) 2019 2018 2019 2018 2019 2018 Projected benefit obligation, January 1 $587 $641 $94 $112 $681 $753 Service cost 8 9 — 1 8 10 Interest cost 23 21 3 3 26 24 Plan amendments (17 ) — — — (17 ) — Actuarial losses (gains) - net 59 (38 ) 1 (9 ) 60 (47 ) Benefits paid (44 ) (45 ) (5 ) (4 ) (49 ) (49 ) Foreign currency translation adjustments — — 4 (8 ) 4 (8 ) Other — (1 ) (1 ) (1 ) (1 ) (2 ) Projected benefit obligation, December 31 $616 $587 $96 $94 $712 $681 Amounts recognized in the Consolidated Balance Sheet: Accounts payable and accrued liabilities (46 ) (48 ) (5 ) (4 ) (51 ) (52 ) Other postretirement benefits (570 ) (539 ) (91 ) (90 ) (661 ) (629 ) Net liability recognized ($616 ) ($587 ) ($96 ) ($94 ) ($712 ) ($681 ) The PBO is the actuarial present value of benefits attributable to employee service rendered to date, including the effects of estimated future pay increases. The accumulated benefit obligation (“ABO”) is the actuarial present value of benefits attributable to employee service rendered to date, but does not include the effects of estimated future pay increases. The ABO for all defined benefit pension plans as of December 31, 2019 and 2018 was $3.4 billion and $2.9 billion , respectively. The following table details the pension plans where the benefit liability exceeds the fair value of the plan assets: Pensions ($ in millions) 2019 2018 Plans with PBO in Excess of Plan Assets: Projected benefit obligation $2,223 $1,935 Fair value of plan assets $1,449 $1,269 Plans with ABO in Excess of Plan Assets: Accumulated benefit obligation $2,176 $1,883 Fair value of plan assets $1,449 $1,269
Accumulated Other Comprehensive Loss Pretax Amounts Not Yet Reflected in Net Periodic Benefit Cost	Pensions Other Postretirement Benefits ($ in millions) 2019 2018 2019 2018 Accumulated net actuarial losses $920 $800 $166 $113 Accumulated prior service cost (credit) 2 2 (138 ) (178 ) Total $922 $802 $28 ($65 )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	The net increase in Accumulated other comprehensive loss (pretax) in 2019 relating to defined benefit pension and other postretirement benefits is primarily attributable to pension and other postretirement plan discount rate declines, as follows: ($ in millions) Pensions Other Postretirement Benefits Net actuarial loss arising during the year $179 $60 New prior service credit — (17 ) Amortization of actuarial loss (62 ) (8 ) Amortization of prior service credit — 57 Foreign currency translation adjustments 5 1 Impact of settlements and curtailments (2 ) — Net change $120 $93
Net Periodic Benefit Cost	Pensions Other Postretirement Benefits ($ in millions) 2019 2018 2017 2019 2018 2017 Service cost $23 $28 $33 $8 $10 $10 Interest cost 105 97 98 26 24 24 Expected return on plan assets (139 ) (150 ) (141 ) — — — Amortization of prior service credit — — — (57 ) (60 ) (59 ) Amortization of actuarial losses 62 63 75 8 19 12 Settlements, curtailments, and special termination benefits 3 5 60 — — — Net periodic benefit cost/(income) $54 $43 $125 ($15 ) ($7 ) ($13 )
Schedule of Contributions to Defined benefit Plans	Contributions to defined benefit pension plans ($ in millions) 2019 2018 2017 U.S. defined benefit pension plans $— $75 $54 Non-U.S. defined benefit pension plans $13 $24 $33
Schedule of Expected Benefit Payments	The estimated benefits expected to be paid under the Company’s defined benefit pension and other postretirement benefit plans are: ($ in millions) Pensions Other Postretirement Benefits 2020 $145 $51 2021 $143 $51 2022 $146 $50 2023 $153 $49 2024 $160 $48 2025 to 2029 $845 $209
Weighted Average Target Pension Plan Asset Allocations	The following summarizes the weighted average target pension plan asset allocation as of December 31, 2019 and 2018 for all PPG defined benefit plans: Asset Category 2019 2018 Equity securities 15-45% 15-45% Debt securities 30-65% 30-65% Real estate 0-10% 0-10% Other 20-40% 20-40%
Fair Values of the Company's Pension Plan Assets by Asset Category	The fair values of the Company’s pension plan assets at December 31, 2019 and 2018 , by asset category, are as follows: December 31, 2019 December 31, 2018 ($ in millions) Level 1 (1) Level 2 (1) Level 3 (1) Total Level 1 (1) Level 2 (1) Level 3 (1) Total Asset Category Equity securities: U.S. Large cap $58 $80 $— $138 $43 $94 $— $137 Small cap 41 — — 41 23 — — 23 Non-U.S. Developed and emerging markets (2) 143 84 — 227 115 103 — 218 Debt securities: Cash and cash equivalents 10 16 — 26 3 19 — 22 Corporate (3) U.S. (4) — 337 77 414 — 220 77 297 Developed and emerging markets (2) — 2 — 2 — 4 — 4 Diversified (5) — 237 — 237 — 142 — 142 Government U.S. (4) 72 9 — 81 68 8 — 76 Developed markets — 7 — 7 — 6 — 6 Other (6) — 18 377 395 — 14 359 373 Real estate, hedge funds, and other — 303 381 684 — 304 359 663 Total assets in the fair value hierarchy $324 $1,093 $835 $2,252 $252 $914 $795 $1,961 Common-collective trusts (7) — — — 713 — — — 657 Total Investments $324 $1,093 $835 $2,965 $252 $914 $795 $2,618 (1) These levels refer to the accounting guidance on fair value measurement described in Note 10 , “ Financial Instruments, Hedging Activities and Fair Value Measurements .” (2) These amounts represent holdings in investment grade debt or equity securities of issuers in both developed markets and emerging economies. (3) This category represents investment grade debt securities from a diverse set of industry issuers. (4) These investments are primarily long duration fixed income securities. (5) This category represents commingled funds invested in diverse portfolios of debt securities. (6) This category includes mortgage-backed and asset backed debt securities, municipal bonds and other debt securities including derivatives. (7) Certain investments that are measured at net asset value per share (or its equivalent) are not required to be classified in the fair value hierarchy.
Change in the Fair Value of the Company's Level 3 Pension Assets	The change in the fair value of the Company’s Level 3 pension assets for the years ended December 31, 2019 and 2018 was as follows: ($ in millions) Real Estate Other Debt Securities Hedge Funds and Other Assets Total January 1, 2018 $138 $418 $446 $1,002 Realized gains/(losses) 9 (29 ) 10 (10 ) Unrealized losses — — (28 ) (28 ) Transfers out, net (6 ) (12 ) (119 ) (137 ) Foreign currency losses (4 ) (18 ) (10 ) (32 ) December 31, 2018 $137 $359 $299 $795 Realized gains/(losses) 18 38 (3 ) 53 Unrealized (losses)/gains (7 ) — 15 8 Transfers (out)/in, net (27 ) (12 ) 17 (22 ) Foreign currency gains/(losses) 2 (8 ) 7 1 December 31, 2019 $123 $377 $335 $835
Benefit Obligations
Weighted Average Assumptions Used for the Defined Benefit Pension and Other Postretirement Plans	The following weighted average assumptions were used to determine the benefit obligation for the Company’s defined benefit pension and other postretirement plans as of December 31, 2019 and 2018 : United States International Total PPG 2019 2018 2019 2018 2019 2018 Discount rate 3.3 % 4.4 % 2.2 % 2.9 % 2.8 % 3.7 % Rate of compensation increase 2.5 % 1.5 % 2.8 % 0.9 % 2.6 % 1.2 %
Benefit Costs
Weighted Average Assumptions Used for the Defined Benefit Pension and Other Postretirement Plans	The following weighted average assumptions were used to determine the net periodic benefit cost for the Company’s defined benefit pension and other postretirement benefit plans for the three years in the period ended December 31, 2019 : 2019 2018 2017 Discount rate 3.7 % 3.2 % 3.6 % Expected return on assets 5.4 % 5.4 % 5.4 % Rate of compensation increase 1.8 % 1.2 % 1.3 %

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of Loss Contingencies by Contingency	Environmental Reserves ($ in millions) 2019 2018 New Jersey Chrome $134 $151 Glass and chemical 96 90 Other 74 50 Total $304 $291 Current Portion $62 $105
Environmental Costs	The pretax charges and cash outlays related to such environmental remediation in 2019 , 2018 and 2017 , were as follows: ($ in millions) 2019 2018 2017 New Jersey Chrome $43 $62 $4 Other 34 16 6 Total $77 $78 $10 Cash outlays for environmental spending $77 $64 $44

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Summary of Shares Outstanding	Common Stock Treasury Stock Shares Outstanding January 1, 2017 581,146,136 (323,815,976 ) 257,330,160 Purchases — (7,427,557 ) (7,427,557 ) Issuances — 1,271,796 1,271,796 December 31, 2017 581,146,136 (329,971,737 ) 251,174,399 Purchases — (15,877,364 ) (15,877,364 ) Issuances — 564,399 564,399 December 31, 2018 581,146,136 (345,284,702 ) 235,861,434 Purchases — (2,722,800 ) (2,722,800 ) Issuances — 2,541,836 2,541,836 December 31, 2019 581,146,136 (345,465,666 ) 235,680,470

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Accumulated Other Comprehensive Loss	($ in millions) Unrealized Foreign Currency Translation Adjustments Pension and Other Postretirement Benefit Adjustments, net of tax (c) Unrealized Gain/(Loss) on Derivatives, net of tax (d) Accumulated Other Comprehensive Loss January 1, 2017 ($1,798 ) ($571 ) $13 ($2,356 ) Current year deferrals to AOCI 542 — — 542 Current year deferrals to AOCI, net of tax (b) (311 ) 20 (4 ) (295 ) Reclassifications from AOCI to net income — 58 (6 ) 52 Period change $231 $78 ($10 ) $299 December 31, 2017 ($1,567 ) ($493 ) $3 ($2,057 ) Current year deferrals to AOCI (a) (292 ) — — (292 ) Current year deferrals to AOCI, net of tax (b) 148 (12 ) (7 ) 129 Reclassifications from AOCI to net income — 21 6 27 Period change ($144 ) $9 ($1 ) ($136 ) Reclassification from AOCI to Retained earnings - Adoption of ASU 2018-02 (23 ) (84 ) — (107 ) December 31, 2018 ($1,734 ) ($568 ) $2 ($2,300 ) Current year deferrals to AOCI (a) 71 — — 71 Current year deferrals to AOCI, net of tax (b) 36 (167 ) 1 (130 ) Reclassifications from AOCI to net income — 11 (2 ) 9 Period change $107 ($156 ) ($1 ) ($50 ) December 31, 2019 ($1,627 ) ($724 ) $1 ($2,350 ) (a) Except for income taxes of $7 million and $9 million as of December 31, 2019 and 2018 , respectively, related to foreign currency impacts of certain unasserted earnings, unrealized foreign currency translation adjustments related to translation of foreign denominated balance sheets are not presented net of tax given that no deferred U.S. income taxes have been provided on undistributed earnings of non-U.S. subsidiaries because they are deemed to be reinvested for an indefinite period of time. (b) The tax (cost)/benefit related to unrealized foreign currency translation adjustments on tax inter-branch transactions and net investment hedges as of December 31, 2019 , 2018 and 2017 was $(19) million , $4 million and $141 million , respectively. (c) The tax benefit/(cost) related to the adjustment for pension and other postretirement benefits as of December 31, 2019 , 2018 and 2017 was $57 million , $(34) million and $(33) million , respectively. Reclassifications from AOCI are included in the computation of net periodic benefit costs (See Note 13 , “ Employee Benefit Plans ”). The cumulative tax benefit related to the adjustment for pension and other postretirement benefits as of December 31, 2019 and 2018 was $266 million and $209 million , respectively. (d) The tax cost related to the change in the unrealized loss on derivatives as of December 31, 2019 , 2018 and 2017 was $1 million , $2 million , and $5 million , respectively. Reclassifications from AOCI are included in the gain or loss recognized on cash flow hedges (See Note 10 “ Financial Instruments, Hedging Activities and Fair Value Measurements ”).

Other Income (Tables)

Other Income (Tables)	12 Months Ended
	Dec. 31, 2019
Other Income and Expenses [Abstract]
Components of Other Earnings	($ in millions) 2019 2018 2017 Gain on sale of assets (1) $7 $33 $28 Royalty income 8 10 11 Share of net earnings of equity affiliates (See Note 6) 11 16 12 Gain on disposal of ownership interest in business affiliate — — 25 Income from a legal settlement — — 18 Other 63 55 56 Total $89 $114 $150

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation, Stock Options, Activity	($ in millions) 2019 2018 2017 Total stock-based compensation $39 $37 $35 Income tax benefit recognized $9 $8 $12
Weighted Average Assumptions Used in Calculating the Fair Value of Stock Option	The following weighted average assumptions were used to calculate the fair values of stock option grants in each year: 2019 2018 2017 Weighted average exercise price $109.74 $115.98 $101.53 Risk free interest rate 2.6 % 2.9 % 2.4 % Expected life of option in years 6.5 6.5 6.5 Expected dividend yield 1.6 % 1.7 % 1.8 % Expected volatility 20.0 % 21.0 % 22.0 %
Stock Options Outstanding, Exercisable and Activity	Stock Options Outstanding and Exercisable Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Life (in years) Intrinsic Value (in millions) Outstanding, January 1, 2019 3,761,000 $90.10 6.1 $61 Granted 588,870 $109.74 Exercised (832,177 ) $73.78 Forfeited/Expired (107,940 ) $107.41 Outstanding, December 31, 2019 3,409,753 $96.93 6.1 $125 Vested or expected to vest, December 31, 2019 3,312,698 $96.54 6.1 $122 Exercisable, December 31, 2019 1,819,591 $86.67 4.4 $85
Stock Option Activity	The following table presents stock option activity for the years ended December 31, 2019 , 2018 and 2017 : ($ in millions) 2019 2018 2017 Total intrinsic value of stock options exercised $38 $19 $40 Cash received from stock option exercises $61 $15 $52 Income tax benefit from the exercise of stock options $9 $4 $15 Total fair value of stock options vested $12 $10 $13
RSU Activity	RSU Activity Number of Shares Weighted Average Fair Value Intrinsic Value (in millions) Outstanding, January 1, 2019 631,731 $102.80 $65 Granted 241,113 $111.25 Released from restrictions (229,238 ) $100.98 Forfeited (32,064 ) $109.34 Outstanding, December 31, 2019 611,542 $109.30 $67 Vested or expected to vest, December 31, 2019 580,878 $109.17 $63

Quarterly Financial Informati_2

Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information (unaudited)	2019 Quarter Ended Full Year 2019 (1) ($ in millions, except per share amounts) March 31 June 30 September 30 December 31 Net sales $3,624 $4,024 $3,826 $3,672 $15,146 Cost of sales (2) 2,073 2,288 2,181 2,111 8,653 Net income (attributable to PPG) Income from continuing operations, net of tax $312 $270 $366 $295 $1,243 Income/(Loss) from discontinued operations, net of tax — 2 1 (3 ) — Net income (attributable to PPG) $312 $272 $367 $292 $1,243 Earnings per common share Income from continuing operations, net of tax $1.32 $1.14 $1.55 $1.24 $5.25 Income/(Loss) from discontinued operations, net of tax — 0.01 — (0.01 ) — Earnings per common share $1.32 $1.15 $1.55 $1.23 $5.25 Earnings per common share - assuming dilution Income from continuing operations, net of tax $1.31 $1.13 $1.54 $1.23 $5.22 Income/(Loss) from discontinued operations, net of tax — 0.01 — (0.01 ) — Earnings per common share – assuming dilution $1.31 $1.14 $1.54 $1.22 $5.22 2018 Quarter Ended Full Year 2018 (1) ($ in millions except per share amounts) March 31 June 30 September 30 December 31 Net sales $3,781 $4,131 $3,817 $3,645 $15,374 Cost of sales (2) 2,181 2,379 2,253 2,188 9,001 Net income (attributable to PPG) Income from continuing operations, net of tax $328 $371 $368 $256 $1,323 Income from discontinued operations, net of tax 6 — 10 2 18 Net income (attributable to PPG) $334 $371 $378 $258 $1,341 Earnings per common share Income from continuing operations, net of tax $1.32 $1.51 $1.52 $1.07 $5.43 Income from discontinued operations, net of tax 0.02 — 0.04 0.01 0.07 Earnings per common share $1.34 $1.51 $1.56 $1.08 $5.50 Earnings per common share - assuming dilution Income from continuing operations, net of tax $1.31 $1.51 $1.51 $1.07 $5.40 Income from discontinued operations, net of tax 0.02 — 0.04 0.01 0.07 Earnings per common share – assuming dilution $1.33 $1.51 $1.55 $1.08 $5.47 (1) Full year earnings-per-share was calculated using the full year weighted average shares outstanding. As such, the sum of the quarters may not equal the total earnings-per-share for the year. (2) Exclusive of depreciation and amortization.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from External Customers by Geographic Areas	Net sales by segment and region for the years ended December 31, 2019 , 2018 and 2017 were as follows: Performance Coatings Industrial Coatings Total Net Sales ($ in millions) 2019 2018 2017 2019 2018 2017 2019 2018 2017 United States and Canada $4,057 $4,062 $4,031 $2,418 $2,423 $2,276 $6,475 $6,485 $6,307 EMEA 2,869 2,936 2,761 1,680 1,742 1,628 4,549 4,678 4,389 Asia Pacific 1,095 1,071 970 1,447 1,547 1,553 2,542 2,618 2,523 Latin America 1,013 1,018 968 567 575 561 1,580 1,593 1,529 Total $9,034 $9,087 $8,730 $6,112 $6,287 $6,018 $15,146 $15,374 $14,748

Reportable Business Segment I_2

Reportable Business Segment Information (Tables)	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Reportable Business Segment	($ in millions) 2019 2018 2017 Net sales to external customers Performance Coatings $9,034 $9,087 $8,730 Industrial Coatings 6,112 6,287 6,018 Total Net sales $15,146 $15,374 $14,748 Segment income Performance Coatings $1,409 $1,300 $1,313 Industrial Coatings 862 818 979 Total Segment income $2,271 $2,118 $2,292 Corporate / Non-Segment Items Legacy items ($1 ) $5 ($2 ) Business restructuring-related costs, net (1) (222 ) (75 ) — Environmental remediation charges and other costs, net (61 ) (77 ) — Acquisition-related costs (2) (17 ) (6 ) (9 ) Litigation matters, net (12 ) (24 ) 18 Impairment of a non-manufacturing asset — (9 ) — Costs related to customer assortment changes — (18 ) — Gain from the sale of non-operating assets — 26 13 Brand rationalization charge — (6 ) — Asset write-downs — — (7 ) Pension settlement charge — — (60 ) Gain on disposal of ownership interest in business affiliate — — 25 Interest expense, net of interest income (100 ) (95 ) (85 ) Corporate unallocated (197 ) (146 ) (180 ) Total Income before income taxes $1,661 $1,693 $2,005 ($ in millions) 2019 2018 2017 Depreciation and amortization Performance Coatings $255 $274 $272 Industrial Coatings 194 181 164 Corporate / Non-Segment Items 62 42 24 Total $511 $497 $460 Share of net earnings of equity affiliates Performance Coatings $1 $1 $2 Industrial Coatings — — — Corporate / Non-Segment Items 10 15 10 Total $11 $16 $12 Segment assets (3) Performance Coatings $10,636 $9,846 $9,763 Industrial Coatings 4,912 4,441 4,563 Corporate / Non-Segment Items 2,160 1,728 2,212 Total $17,708 $16,015 $16,538 Investment in equity affiliates Performance Coatings $33 $33 $32 Industrial Coatings 14 13 13 Corporate / Non-Segment Items 82 86 89 Total $129 $132 $134 Expenditures for property (including business acquisitions) Performance Coatings $483 $545 $224 Industrial Coatings 510 157 328 Corporate / Non-Segment Items 63 87 133 Total $1,056 $789 $685
Geographic Information	($ in millions) 2019 2018 2017 Geographic Information Net sales (4) United States and Canada $6,475 $6,485 $6,307 Europe, Middle East and Africa (“EMEA”) 4,549 4,678 4,389 Asia Pacific 2,542 2,618 2,523 Latin America 1,580 1,593 1,529 Total $15,146 $15,374 $14,748 Segment income United States and Canada $1,073 $1,022 $1,135 EMEA 569 549 560 Asia Pacific 342 306 361 Latin America 287 241 236 Total $2,271 $2,118 $2,292 Property—net United States and Canada $1,300 $1,254 $1,224 EMEA 836 777 826 Asia Pacific 538 482 493 Latin America 309 292 281 Total $2,983 $2,805 $2,824 (1) Included in business restructuring-related costs, net are business restructuring charges, accelerated depreciation of certain assets and other related costs, offset by releases related to previously approved programs. (2) Acquisition-related costs include advisory, legal, accounting, valuation, and other professional or consulting fees incurred to effect acquisitions. These costs are included in Selling, general and administrative expense in the consolidated statement of income. Acquisition-related costs also include the impact for the step up to fair value of inventory acquired in certain acquisitions which are included in Cost of sales, exclusive of depreciation and amortization in the consolidated statement of income. (3) Segment assets are the total assets used in the operation of each segment. Corporate assets are principally cash and cash equivalents, cash held in escrow, short term investments and deferred tax assets. (4) Net sales to external customers are attributed to geographic regions based upon the location of the operating unit shipping the product.

Leases Leases - Narrative (Deta

Leases Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Lease expense for operating leases	$ 289	$ 288

Leases - Schedule of Components

Leases - Schedule of Components of Lease Expense (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Total operating lease cost	$ 232
Finance lease cost:
Interest on lease liabilities	1
Amortization of right-of-use assets	2
Total finance lease cost	3
Total lease cost	235
Variable lease costs	15
Short-term lease costs	5
Cost of sales, exclusive of depreciation and amortization
Lessee, Lease, Description [Line Items]
Total operating lease cost	34
Selling, general and administrative
Lessee, Lease, Description [Line Items]
Total operating lease cost	$ 198

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Additional Information) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)Segment	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Advertising costs expensed	$ 283	$ 280	$ 313
Research and development – total	456	464	472
Less depreciation on research facilities	24	23	21
Research and development, net	$ 432	441	$ 451
Number of operating segments | Segment	9
Asset retirement obligation	$ 21	$ 22
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Identifiable intangible assets with finite lives estimated useful lives	1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Identifiable intangible assets with finite lives estimated useful lives	30 years

Leases - Schedule of Classifica

Leases - Schedule of Classification on the Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets:
Operating	$ 782	$ 0
Finance	17
Total leased assets	799
Current
Operating	170	0
Finance	3
Noncurrent
Operating	622	$ 0
Finance	8
Total lease liabilities	803
Accumulated depreciation	$ 11

Leases - Schedule of Cash Paid

Leases - Schedule of Cash Paid for Lease Liabilities and Right-of-Use Assets Obtained in Exchange for Lease Obligations (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 210
Operating cash flows from finance leases	1
Financing cash flows from finance leases	4
Operating leases	219
Finance leases	$ 1

Leases - Schedule of Weighted-A

Leases - Schedule of Weighted-Average Remaining Lease Term and Weighted-Average Discount Rate (Details)	Dec. 31, 2019
Leases [Abstract]
Weighted-average remaining lease term, operating leases	7 years 4 months 24 days
Weighted-average remaining lease term, finance leases	6 years 2 months 12 days
Weighted-average discount rate, operating leases	3.00%
Weighted-average discount rate, finance leases	9.40%

Leases - Schedule of Maturities

Leases - Schedule of Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Operating Leases
Remaining three months of 2019	$ 191
2020	150
2021	118
2022	92
2023	72
Thereafter	266
Total lease payments	889
Less: Interest	97
Total lease obligations	792
Finance Leases
Remaining three months of 2019	3
2020	2
2021	2
2022	2
2023	1
Total lease payments	13
Less: Interest	2
Thereafter	3
Finance lease liability	$ 11
Operating Leases
2019		$ 207
2020		157
2021		116
2022		93
2023		76
Thereafter		244
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019		3
2020		3
2021		1
2022		1
2023		1
Beyond 2023		$ 3

Acquisitions and Dispositions_2

Acquisitions and Dispositions (Acquistions) (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2017distribution_center	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Jan. 31, 2018store	Jun. 30, 2016	Dec. 31, 2013
Business Acquisition [Line Items]
Consideration paid for acquired entities, net of cash acquired, debt assumed, and other adjustments		$ 9	$ 108	$ 74
Number Of Distributors (more than) | distribution_center	200
Taiwan Chlorine Industries (“TCI”)
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, net				$ 100
ProCoatings [Member]
Business Acquisition [Line Items]
Number of stores | store					27
Taiwan Chlorine Industries (“TCI”)
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent				40.00%		40.00%	60.00%
Taiwan Chlorine Industries (“TCI”) | China Petrochemical Development Corporation [Member]
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent						40.00%
China Petrochemical Development Corporation [Member] | Axiall Corporation
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent						40.00%

Acquisitions and Dispositions D

Acquisitions and Dispositions Divestitures (Details) $ in Millions	Sep. 01, 2017USD ($)	Jun. 30, 2017USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2019USD ($)Segment	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash (used for)/from operating activities, discontinued operations											$ (4)	$ (20)	$ 17
Number of reportable business segments | Segment											2
Total Net sales			$ 3,672	$ 3,826	$ 4,024	$ 3,624	$ 3,645	$ 3,817	$ 4,131	$ 3,781	$ 15,146	15,374	14,748
Net gains on the divestitures of businesses											0	0	25
Income tax expense											392	353	615
Income from discontinued operations, net of tax			$ 292	$ 367	$ 272	$ 312	$ 258	$ 378	$ 371	$ 334	1,243	1,341	1,594
North American Fiber Glass Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gains on the divestitures of businesses	$ 343
Estimated proceeds from sale of business	$ 541
Glass Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax												13
Cash (used for)/from operating activities, discontinued operations												20
Total Net sales											0	0	217
Income from operations											3	21	30
Net gains on the divestitures of businesses											0	0	343
Income tax expense											1	5	140
Income from discontinued operations, net of tax											$ 2	$ 16	$ 233
Mexican Plaka Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gains on the divestitures of businesses		$ 25

Working Capital Detail (Detail)

Working Capital Detail (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure Components Of Working Capital Detail [Abstract]
Trade - net	$ 2,479	$ 2,505
Equity affiliates	3	4
Other - net	274	336
Total	2,756	2,845
Finished products	1,047	1,105
Work in process	197	193
Raw materials	431	452
Supplies	35	33
Total	1,710	1,783
Trade	2,098	2,177
Accrued payroll	455	424
Customer rebates	280	283
Other postretirement and pension benefits	85	80
Income taxes	46	112
Other	532	547
Total	$ 3,496	$ 3,623

Working Capital Detail (Additio

Working Capital Detail (Additional Information) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure Components Of Working Capital Detail [Abstract]
Allowance for doubtful accounts	$ 22	$ 24
Percentage of inventories valued using the LIFO method	34.00%	36.00%
FIFO adjustment	$ 124	$ 113
Effect of LIFO on earnings, income	$ 1	$ 2

Property, Plant and Equipment_2

Property, Plant and Equipment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant, and Equipment Disclosure [Line Items]
Property	$ 7,065	$ 6,633
Accumulated depreciation, depletion and amortization, property, plant, and equipment	4,082	3,828
Property, plant and equipment, net	2,983	2,805	$ 2,824
Capitalized interest	6	4	$ 7
Land and land improvements
Property, Plant, and Equipment Disclosure [Line Items]
Property	$ 511	489
Land and land improvements | Minimum
Property, Plant, and Equipment Disclosure [Line Items]
Property useful lives	1 year
Land and land improvements | Maximum
Property, Plant, and Equipment Disclosure [Line Items]
Property useful lives	30 years
Buildings
Property, Plant, and Equipment Disclosure [Line Items]
Property	$ 1,573	1,472
Buildings | Minimum
Property, Plant, and Equipment Disclosure [Line Items]
Property useful lives	20 years
Buildings | Maximum
Property, Plant, and Equipment Disclosure [Line Items]
Property useful lives	40 years
Machinery and equipment
Property, Plant, and Equipment Disclosure [Line Items]
Property	$ 3,575	3,387
Machinery and equipment | Minimum
Property, Plant, and Equipment Disclosure [Line Items]
Property useful lives	5 years
Machinery and equipment | Maximum
Property, Plant, and Equipment Disclosure [Line Items]
Property useful lives	25 years
Other
Property, Plant, and Equipment Disclosure [Line Items]
Property	$ 1,092	989
Other | Minimum
Property, Plant, and Equipment Disclosure [Line Items]
Property useful lives	3 years
Other | Maximum
Property, Plant, and Equipment Disclosure [Line Items]
Property useful lives	20 years
Construction in progress
Property, Plant, and Equipment Disclosure [Line Items]
Property	$ 314	$ 296

Investments (Detail)

Investments (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]
Investments	$ 258	$ 251
Investments in equity affiliates
Debt and Equity Securities, FV-NI [Line Items]
Investments	129	132
Marketable equity securities (See Note 10) | Trading Securities
Debt and Equity Securities, FV-NI [Line Items]
Investments	80	69
Other
Debt and Equity Securities, FV-NI [Line Items]
Investments	$ 49	$ 50

Investments (Additional Informa

Investments (Additional Information) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2016	Dec. 31, 2013
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Equity in undistributed earnings losses of subsidiaries	$ 11	$ 11
Proceeds from dividends received	$ 15	$ 15	$ 8
Minimum | Investments In Other Operating Joint Venture
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Percentage of ownership interests	20.00%
Maximum | Investments In Other Operating Joint Venture
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Percentage of ownership interests	50.00%
Taiwan Chlorine Industries (“TCI”)
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Noncontrolling interest, ownership percentage by parent			40.00%	40.00%	60.00%

Goodwill and Other Identifiab_3

Goodwill and Other Identifiable Intangible Assets (Carrying Amount of Goodwill Attributable to Each Reportable Segment) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning Balance	$ 4,070	$ 3,942
Goodwill from acquisitions	396	235
Currency translation	4	(107)
Ending Balance	4,470	4,070
Performance Coatings
Goodwill [Roll Forward]
Beginning Balance	3,266	3,104
Goodwill from acquisitions	166	248
Currency translation	10	(86)
Ending Balance	3,442	3,266
Industrial Coatings Segment
Goodwill [Roll Forward]
Beginning Balance	804	838
Goodwill from acquisitions	230	(13)
Currency translation	(6)	(21)
Ending Balance	$ 1,028	$ 804

Goodwill and Other Identifiab_4

Goodwill and Other Identifiable Intangible Assets (Identifiable Intangible Assets with Finite Lives) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Carrying amount of acquired trademarks with indefinite lives	$ 1,167	$ 1,140
Gross carrying amount	2,549	2,278
Accumulated amortization	(1,585)	(1,446)
Net	964	832
Intangible assets, gross (excluding goodwill)	3,716	3,418
Intangible assets, accumulated amortization (excluding goodwill)		1,446
Total Identifiable Intangible Assets	2,131	1,972
Aggregate amortization expense of identifiable intangible assets	136	143	$ 129
Estimated future amortization of identifiable intangible assets in 2020	135
Estimated future amortization of identifiable intangible assets in 2021	120
Estimated future amortization of identifiable intangible assets in 2022	115
Estimated future amortization of identifiable intangible assets in 2023	105
Estimated future amortization of identifiable intangible assets in 2024	85
Acquired technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	710	648
Accumulated amortization	(549)	(515)
Net	161	133
Customer-related
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,578	1,396
Accumulated amortization	(885)	(798)
Net	693	598
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	210	190
Accumulated amortization	(111)	(96)
Net	99	94
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	51	44
Accumulated amortization	(40)	(37)
Net	$ 11	$ 7

Business Restructuring (Additio

Business Restructuring (Additional Information) (Detail) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Business restructuring			$ 83	$ 176	$ 66	$ 0
Restructuring reserve, release of previously approved programs				(18)	(49)
Payments for restructuring				58	66	49
Restructuring reserve, foreign currency translation gain (loss)				(4)	4
Restructuring, other adjustment					12
Total reserve balance				224	110	$ 102
2019 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Business restructuring	$ 10	$ 184
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Business restructuring			$ 80
Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Business restructuring				194	83
Restructuring reserve, approval of new programs					32
Restructuring reserve, release of previously approved programs				$ (18)	$ (49)

Borrowings and Lines of Credi_2

Borrowings and Lines of Credit (Long-term Debt Obligations) (Details) € in Millions	Aug. 30, 2019USD ($)	Aug. 15, 2019USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019EUR (€)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2017EUR (€)	Feb. 28, 2018USD ($)
Debt Instrument [Line Items]
Long-term debt			$ 5,031,000,000				$ 5,031,000,000		$ 5,000,000,000
Line of credit, amount outstanding			0				0		0
Finance lease obligation			11,000,000				11,000,000
Capital lease obligations									12,000,000
Long-term debt and finance lease obligations			5,042,000,000				5,042,000,000		5,012,000,000
Less payments due within one year			503,000,000				503,000,000		647,000,000
Long-term debt			$ 4,539,000,000				$ 4,539,000,000		4,365,000,000
Effective interest rates			2.80%				2.80%
Repayments of debt			$ 634,000,000				$ 637,000,000		6,000,000	$ 588,000,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,200,000,000
Line of credit facility, additional borrowing capacity available	$ 750,000,000
Proceeds from Issuance of Debt				$ 595,000,000	$ 992,000,000
Notes 0.00% Due 2019
Debt Instrument [Line Items]
Long-term debt			$ 0				0		343,000,000
Notional amount of non-derivative instruments							$ 300,000,000
Debt instrument, interest rate, stated percentage			0.00%				0.00%
Notes 2.3 Percent Due 2019
Debt Instrument [Line Items]
Long-term debt			$ 0				$ 0		299,000,000
Notional amount of non-derivative instruments							$ 300,000,000
Debt instrument, interest rate, stated percentage			2.30%				2.30%
Debt Redemption Price Percent Of Principal Amount												101.00%
Notes 3.6 Percent Due 2020
Debt Instrument [Line Items]
Long-term debt			$ 499,000,000				$ 499,000,000		498,000,000
Debt instrument, interest rate, stated percentage			3.60%				3.60%
Non-callable Debentures 9 Percent Due 2021
Debt Instrument [Line Items]
Long-term debt			$ 134,000,000				$ 134,000,000		133,000,000
Debt instrument, interest rate, stated percentage			9.00%				9.00%
Notes 0.875 Percent Due 2022
Debt Instrument [Line Items]
Long-term debt			$ 671,000,000				$ 671,000,000		685,000,000
Notional amount of non-derivative instruments | €								€ 600
Debt instrument, interest rate, stated percentage			0.875%				0.875%
3.2% Notes due 2023
Debt Instrument [Line Items]
Long-term debt			$ 298,000,000				$ 298,000,000		$ 298,000,000
Effective interest rates			2.90%				2.90%		2.70%
Interest rate swaps												$ 150,000,000
Notional amount of non-derivative instruments									$ 300,000,000
Debt instrument, interest rate, stated percentage									3.20%
2.4% Notes due 2024
Debt Instrument [Line Items]
Long-term debt			$ 297,000,000				$ 297,000,000		$ 0
Notional amount of non-derivative instruments		$ 300,000,000
Debt instrument, interest rate, stated percentage		2.40%
Notes 0.875% Due 2025
Debt Instrument [Line Items]
Long-term debt			665,000,000				665,000,000		679,000,000
Notes 1.4 Percent Due 2027
Debt Instrument [Line Items]
Long-term debt			$ 665,000,000				$ 665,000,000		679,000,000
Debt instrument, interest rate, stated percentage			1.40%				1.40%
3.75% Notes due 2028
Debt Instrument [Line Items]
Long-term debt			$ 695,000,000				$ 695,000,000		$ 694,000,000
Effective interest rates			3.30%				3.30%		3.20%
Interest rate swaps												$ 375,000,000
Notional amount of non-derivative instruments									$ 700,000,000
Debt instrument, interest rate, stated percentage									3.75%
2.8% Notes due 2029
Debt Instrument [Line Items]
Long-term debt			$ 297,000,000				$ 297,000,000		$ 0
Notional amount of non-derivative instruments		$ 300,000,000
Debt instrument, interest rate, stated percentage		2.80%
Notes 2.5 Percent Due 2029
Debt Instrument [Line Items]
Long-term debt			$ 88,000,000				$ 88,000,000		91,000,000
Notional amount of non-derivative instruments | €								80
Debt instrument, interest rate, stated percentage			2.50%				2.50%
Notes 7.70 Percent Due 2038
Debt Instrument [Line Items]
Long-term debt			$ 174,000,000				$ 174,000,000		174,000,000
Debt instrument, interest rate, stated percentage			7.70%				7.70%
Notes 5.5 Percent Due 2040
Debt Instrument [Line Items]
Long-term debt			$ 247,000,000				$ 247,000,000		247,000,000
Debt instrument, interest rate, stated percentage			5.50%				5.50%
Notes 3.0 Percent Due 2044
Debt Instrument [Line Items]
Long-term debt			$ 127,000,000				$ 127,000,000		131,000,000
Notional amount of non-derivative instruments | €								€ 120
Debt instrument, interest rate, stated percentage			3.00%				3.00%
Commercial paper
Debt Instrument [Line Items]
Line of credit, amount outstanding			$ 100,000,000				$ 100,000,000		0
Other Non-US Debt
Debt Instrument [Line Items]
Long-term debt			$ 38,000,000				$ 38,000,000		$ 39,000,000
Long-term debt, percentage bearing variable interest, percentage rate			3.70%				3.70%		3.80%
Impact Of Derivatives On Debt
Debt Instrument [Line Items]
Long-term debt			$ 36,000,000				$ 36,000,000		$ 10,000,000
Effective interest rates			8.40%				8.40%		8.40%
3-year Variable Rate Euro Bank Loan Due 2017
Debt Instrument [Line Items]
Repayments of debt						$ 587,000,000
Notional amount of non-derivative instruments | €											€ 500
Minimum
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.06%
Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.125%

Borrowings and Lines of Credi_3

Borrowings and Lines of Credit (Long-term Debt Maturities) (Details) $ in Millions	Dec. 31, 2019USD ($)
Debt Disclosure [Abstract]
Aggregate maturities of long-term debt, in 2020	$ 503
Aggregate maturities of long-term debt, in 2021	166
Aggregate maturities of long-term debt, in 2022	669
Aggregate maturities of long-term debt, in 2023	302
Aggregate maturities of long-term debt, in 2024	396
Aggregate maturities of long-term debt, Thereafter	$ 3,006

Borrowings and Lines of Credi_4

Borrowings and Lines of Credit (Short-term Debt Outstanding) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Short-term Debt	$ 10	$ 4
Weighted average interest rate	3.60%	3.40%

Borrowings and Lines of Credi_5

Borrowings and Lines of Credit (Additional Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Line of credit, amount outstanding	$ 0	$ 0
Outstanding letters of credit and surety bonds	152,000,000	158,000,000
Guarantees outstanding	$ 9,000,000	14,000,000
Non-callable Debentures 9 Percent Due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	9.00%
Long-term debt, contingent payment of principal or interest	$ 10,000,000
Minimum
Debt Instrument [Line Items]
Periodic payment amount	50,000,000
Guarantee of Indebtedness of Others
Debt Instrument [Line Items]
Carrying value of guarantees	0	0
Fair value of guarantees	0	$ 1,000,000
International Operations
Debt Instrument [Line Items]
Lines of credit, current borrowing capacity	396,000,000
Line of credit, amount outstanding	$ 2,000,000

Financial Instruments, Hedgin_3

Financial Instruments, Hedging Activities and Fair Value Measurements (Additional Information) (Detail) € in Billions	12 Months Ended
	Dec. 31, 2019EUR (€)	Dec. 31, 2018EUR (€)	Dec. 31, 2017USD ($)	Dec. 31, 2019USD ($)	Aug. 30, 2019USD ($)	Dec. 31, 2018USD ($)	Feb. 28, 2018USD ($)	Dec. 31, 2016USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Finance lease liability				$ 11,000,000
Foreign Currency Contracts, Liability, Fair Value Disclosure						$ 36,000,000
Notional Amount of Derivative Instruments Designated as Net Investment Hedges							$ 560,000,000
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value, Net				48,000,000		35,000,000
Fair Value of Debt Instrument Designated as a Hedge of Net Investment in Foreign Operations				2,200,000,000		2,600,000,000
Derivative, Cash Received on Hedge			$ 3,000,000
Foreign Currency Contracts, Liability, Fair Value Disclosure				6,000,000
Accumulated pretax unrealized translation gains			$ 5,672,000,000	5,403,000,000		4,732,000,000		$ 4,915,000,000
Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Foreign Currency Contracts, Liability, Fair Value Disclosure				1,000,000		1,000,000
Notional Amount of Derivative Instruments Designated as Net Investment Hedges				43,000,000		50,000,000
Net Investment Hedging
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivative Instruments Designated as Net Investment Hedges							575,000,000
Notional Amount of Nonderivative Instruments | €	€ 2	€ 2.3
Foreign Currency Contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivative Instruments Designated as Net Investment Hedges				2,800,000,000		2,500,000,000
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivative Instruments Designated as Net Investment Hedges							$ 525,000,000
Interest Rate Derivatives, at Fair Value, Net				35,000,000		8,000,000
Currency Swap
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivative Instruments Designated as Net Investment Hedges					$ 300,000,000
Designated as Hedging Instrument | Foreign Currency Contracts | Cash Flow Hedging | Settlement Date 15 March 2018
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivative Instruments Designated as Net Investment Hedges						560,000,000
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Accumulated pretax unrealized translation gains				$ 235,000,000		$ 161,000,000

Financial Instruments, Hedgin_4

Financial Instruments, Hedging Activities and Fair Value Measurements (Fair Value, Cash Flow and Net Investment Hedges) (Detail) $ in Millions, € in Billions	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2019EUR (€)	Dec. 31, 2018USD ($)	Dec. 31, 2018EUR (€)	Dec. 31, 2017USD ($)
Fair Value Hedging
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized Amount	$ 3		$ 3		$ 0
Fair Value Hedging | Foreign Currency Contracts | Interest expense
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized Amount	3		3		0
Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Gain (Loss) Deferred in OCI	2		(9)		(7)
Gain (Loss) Recognized Amount	(3)		(8)		9
Cash Flow Hedging | Foreign Currency Contracts | Other Expense
Derivatives, Fair Value [Line Items]
Gain (Loss) Deferred in OCI	2		(9)		(7)
Gain (Loss) Recognized Amount	(3)		(8)		9
Net Investment Hedging
Derivatives, Fair Value [Line Items]
Notional Amount of Nonderivative Instruments | €		€ 2		€ 2.3
Gain (Loss) Deferred in OCI	74		145		(464)
Gain (Loss) Recognized Amount	18		13		0
Net Investment Hedging | Currency Swap
Derivatives, Fair Value [Line Items]
Gain (Loss) Deferred in OCI	13		21		(61)
Gain (Loss) Recognized Amount	18		13		0
Net Investment Hedging | Other Foreign Currency Denominated Debt
Derivatives, Fair Value [Line Items]
Gain (Loss) Deferred in OCI	61		124		(403)
Economic Hedging | Foreign Currency Contracts | Other Expense
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized Amount	$ 55		$ 55		$ 14

Financial Instruments, Hedgin_5

Financial Instruments, Hedging Activities and Fair Value Measurements (Assets and Liabilities Reported at Fair Value on a Recurring Basis) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Level 1 | Short-term Investments | Marketable Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets reported at fair value on a recurring basis	$ 5	$ 4
Level 1 | Investments | Marketable Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets reported at fair value on a recurring basis	80	69
Level 2 | Other Assets | Cross Currency Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets reported at fair value on a recurring basis	52	35
Level 2 | Other Assets | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets reported at fair value on a recurring basis	35	8
Level 2 | Accounts Payable and Accrued Liabilities | Foreign Currency Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities reported at fair value on a recurring basis	1	1
Level 2 | Other Liabilities [Member] | Cross Currency Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities reported at fair value on a recurring basis	4	0
Not Designated as Hedging Instrument [Member] | Level 2 | Other Current Assets | Foreign Currency Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets reported at fair value on a recurring basis	14	45
Not Designated as Hedging Instrument [Member] | Level 2 | Accounts Payable and Accrued Liabilities | Foreign Currency Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities reported at fair value on a recurring basis	$ 20	$ 9

Financial Instruments, Hedgin_6

Financial Instruments, Hedging Activities and Fair Value Measurements (Fair Value Additional Information) (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Finance lease liability	$ 11,000,000
Foreign Currency Contract, Asset, Fair Value Disclosure		$ 36,000,000
Long-term debt	5,031,000,000	5,000,000,000
Long-term debt (excluding capital lease obligations), fair values	5,363,000,000	5,101,000,000
Capital lease obligations		12,000,000
Short-term Debt	10,000,000	4,000,000
Noncontrolling Interest in Joint Ventures	$ 0	$ 40,000,000

Earnings Per Common Share (Addi

Earnings Per Common Share (Additional Detail) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings per common share (attributable to PPG)
Income from continuing operations, net of tax	$ 295	$ 366	$ 270	$ 312	$ 256	$ 368	$ 371	$ 328	$ 1,243	$ 1,323	$ 1,369
Income from discontinued operations, net of tax	(3)	1	2	0	2	10	0	6	0	18	225
Net income (attributable to PPG)	$ 292	$ 367	$ 272	$ 312	$ 258	$ 378	$ 371	$ 334	$ 1,243	$ 1,341	$ 1,594
Weighted average common shares outstanding									236.9	243.9	256.1
Effect of dilutive securities:
Stock options									0.6	0.8	0.9
Other stock compensation plans									0.7	0.7	0.8
Potentially dilutive common shares									1.3	1.5	1.7
Adjusted weighted average common shares outstanding									238.2	245.4	257.8
Earnings per common share (attributable to PPG):
Continuing operations (in dollars per share)	$ 1.24	$ 1.55	$ 1.14	$ 1.32	$ 1.07	$ 1.52	$ 1.51	$ 1.32	$ 5.25	$ 5.43	$ 5.34
Discontinued operations (in dollars per share)	(0.01)	0	0.01	0	0.01	0.04	0	0.02	0	0.07	0.88
Net Income (attributable to PPG) (in dollars per share)	1.23	1.55	1.15	1.32	1.08	1.56	1.51	1.34	5.25	5.50	6.22
Earnings per common share - assuming dilution (attributable to PPG)
Continuing operations (in dollars per share)	1.23	1.54	1.13	1.31	1.07	1.51	1.51	1.31	5.22	5.40	5.31
Discontinued operations (in dollars per share)	(0.01)	0	0.01	0	0.01	0.04	0	0.02	0	0.07	0.87
Earnings per common share - assuming dilution (in dollars per share)	$ 1.22	$ 1.54	$ 1.14	$ 1.31	$ 1.08	$ 1.55	$ 1.51	$ 1.33	$ 5.22	$ 5.47	$ 6.18
Outstanding stock options excluded from the computation of diluted earnings per share due to their antidilutive effect									0.9	1	0.6

Income Taxes (Additional Inform

Income Taxes (Additional Information) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Percent	23.60%	20.90%	30.70%
Net tax charge for Tax Cuts and Jobs Act		$ 42	$ 134
One-time tax on unrepatriated foreign earnings		20	250
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			125
Benefit from reversal of existing deferred tax liability on repatriated foreign earnings		22	$ 150
Expense for global intangible low taxed income		14
Benefit from foreign derived intangible income		$ 14
U.S. federal income tax rate	21.00%	21.00%	35.00%
Deferred income taxes	$ (5)	$ 45	$ 38
Pension settlement charge	0	0	60
Income before income taxes of non-US operations	1,661	1,693	2,005
Net operating loss carryforwards	182	192
Deferred Tax Assets, Tax Credit Carryforwards, Other	59	61
Unrecognized tax benefits that would affect the effective tax rate, if recognized	143
Accrued estimated interest and penalties on unrecognized tax benefits	17	16	15
Recognized (income) expense for estimated interest and penalties	1	2	4
U.S.
Income Taxes [Line Items]
Deferred income taxes	22
Income before income taxes of non-US operations	596	571	713
Non United States
Income Taxes [Line Items]
Income before income taxes of non-US operations	1,065	1,122	1,292
Net Operating Loss, Indefinite Life
Income Taxes [Line Items]
Net operating loss carryforwards	157	124
Net Operating Loss, Expiring Within 20 Years
Income Taxes [Line Items]
Net operating loss carryforwards	$ 25	$ 68
Pension Settlement Charges
Income Taxes [Line Items]
Deferred income taxes			22
Pension settlement charge			$ 60

Income Taxes (Components of Inc

Income Taxes (Components of Income Tax Expense) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income tax expense
U.S. federal	$ 86	$ 7	$ 179
U.S. State and local	15	4	49
Non-U.S.	296	297	349
Total current income tax	397	308	577
Deferred income tax expense
U.S. federal	(1)	44	107
U.S. State and local	13	7	(16)
Non-U.S.	(17)	(6)	(53)
Deferred Income Tax Expense (Benefit)	(5)	45	38
Total	$ 392	$ 353	$ 615

Income Taxes (Reconciliation of

Income Taxes (Reconciliation of Statutory U.S. Corporate Federal Income Tax Rate to Effective Income Tax Rate) (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. federal income tax rate	21.00%	21.00%	35.00%
Changes in rate due to:
U.S. tax cost/(benefit) - Tax Cuts & Jobs Act	0.30%	(2.50%)	11.00%
U.S./foreign tax differential	2.90%	3.30%	9.30%
U.S. current tax benefit on foreign exchange realization	0.00%	0.00%	(4.90%)
U.S. state and local taxes	(0.70%)	(1.00%)	(2.30%)
U.S. tax benefit on foreign dividends	(0.90%)	(0.40%)	(1.90%)
U.S. state and local taxes	1.30%	0.50%	1.10%
U.S. deferred tax benefit on foreign income			(0.60%)
Other	(0.30%)		2.60%
Effective income tax rate	23.60%	20.90%	30.70%

Income Taxes (Net Deferred Inco

Income Taxes (Net Deferred Income Tax Assets and Liabilities) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)jurisdiction	Dec. 31, 2018USD ($)
Income Tax Examination [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 158	$ 164
Undistributed Earnings of Foreign Subsidiaries	$ 3,600	3,000
Number of PPG Subsidiaries	290
Number of taxable jurisdictions | jurisdiction	75
Income Tax, Potential U.S. Tax Cost for Repatriation of Foreign Earnings	$ 32	19
Deferred income tax assets related to
Employee benefits	382	366
Contingent and accrued liabilities	148	149
Operating loss and other carry-forwards	225	251
Inventories	4	7
Other	87	82
Valuation allowance	(158)	(164)
Total	688	691
Deferred income tax liabilities related to
Property	277	262
Intangibles	594	545
Employee benefits	65	46
Other	2	15
Total	938	868
Deferred income tax liabilities – net	$ (250)	$ (177)
Minimum
Income Tax Examination [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2020
Tax Credit Carryforward, Expiration Date	Dec. 31, 2020
Maximum
Income Tax Examination [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2039
Tax Credit Carryforward, Expiration Date	Dec. 31, 2039

Income Taxes (Unrecognized Tax

Income Taxes (Unrecognized Tax Benefits) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Undistributed Earnings of Foreign Subsidiaries	$ 3,600	$ 3,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	166	148	$ 94
Current year tax positions - additions	25	36	37
Prior year tax positions - additions	4	17	26
Prior year tax positions - reductions	(9)	(6)	0
Statute of limitations expirations	(6)	(9)	(8)
Settlements	(12)	(15)	(10)
Foreign currency translation	(1)	(5)	9
Ending balance	$ 167	$ 166	$ 148

Employee Benefit Plans (Additio

Employee Benefit Plans (Additional Information) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan			$ 20
Contributions to defined benefit pension plans			75
Pension settlement charge		$ 0	0	$ 60
ABO for all defined benefit pension plans		$ 3,400	$ 2,900
Return on plan assets assumption		5.40%	5.40%	5.40%
Impact on net periodic pension expense		$ 13
Weighted-average healthcare cost trend rate assumed for next fiscal year		5.00%
Assumed ultimate health care cost trend rate		4.30%
Aggregate PBO for the pension plans with PBO in excess of plan assets		$ 2,223	$ 1,935
Aggregate fair value of plan assets for the pension plans with PBO in excess of plan assets		1,449	1,269
Aggregate ABO for the pension plans with ABO in excess of plan assets		2,176	1,883
Fair value of plan assets for the pension plans with ABO in excess of plan assets		1,449	1,269
Scenario, Forecast
Pension and Other Postretirement Benefits Disclosure [Line Items]
Weighted-average healthcare cost trend rate assumed for next fiscal year	4.80%
Assumed ultimate health care cost trend rate	4.30%
Pension Plan [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contributions to defined benefit pension plans		13	99
Defined Benefit Plan, Benefit Obligation, Benefits Paid		144	125
Net actuarial loss arising during the year		179
Estimated future benefit payments in 2020		145
Estimated future benefit payments in 2021		143
Estimated future benefit payments in 2022		146
Estimated future benefit payments in 2023		153
Estimated future benefit payments in 2024		160
Estimated aggregate future benefits payments for the five years thereafter		845
Pension Plan [Member] | Scenario, Forecast
Pension and Other Postretirement Benefits Disclosure [Line Items]
Impact on net periodic pension expense	$ 16
Postretirement Health Coverage
Pension and Other Postretirement Benefits Disclosure [Line Items]
Plan amendments				$ (306)
Amortization reduction period				5 years 7 months 6 days
Other Postretirement Benefits
Pension and Other Postretirement Benefits Disclosure [Line Items]
Plan amendments		(17)	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid		49	49
Net actuarial loss arising during the year		60
Estimated future benefit payments in 2020		51
Estimated future benefit payments in 2021		51
Estimated future benefit payments in 2022		50
Estimated future benefit payments in 2023		49
Estimated future benefit payments in 2024		48
Estimated aggregate future benefits payments for the five years thereafter		$ 209
Other Postretirement Benefits | Scenario, Forecast
Pension and Other Postretirement Benefits Disclosure [Line Items]
Impact on net periodic pension expense	$ 6
Welfare Benefits - U.S.
Pension and Other Postretirement Benefits Disclosure [Line Items]
Percentage of defined benefit pension plan assets market value		87.00%
U.S. Qualified Pension Plan
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Benefits Paid				$ 87
Pension settlement charge				35
U.S. Non-qualified Plan
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Benefits Paid				40
Pension settlement charge				22
United States, Canada, Netherlands and United Kingdom
Pension and Other Postretirement Benefits Disclosure [Line Items]
Percentage of defined benefit pension plan assets market value		93.00%
United States
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contributions to defined benefit pension plans		$ 0	75	54
Return on plan assets assumption		7.40%
United States | Scenario, Forecast
Pension and Other Postretirement Benefits Disclosure [Line Items]
Return on plan assets assumption	7.40%
United States | Pension Plan [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contributions to defined benefit pension plans		$ 0	75
Defined Benefit Plan, Benefit Obligation, Benefits Paid		80	70
United States | Other Postretirement Benefits
Pension and Other Postretirement Benefits Disclosure [Line Items]
Plan amendments		(17)	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid		44	45
International
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contributions to defined benefit pension plans		13	24	$ 33
Estimated future mandatory contributions, low end of range		15
Estimated future mandatory contributions, high end of range		20
International | Scenario, Forecast
Pension and Other Postretirement Benefits Disclosure [Line Items]
Return on plan assets assumption	5.00%
International | Pension Plan [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contributions to defined benefit pension plans		13	24
Defined Benefit Plan, Benefit Obligation, Benefits Paid		64	55
International | Other Postretirement Benefits
Pension and Other Postretirement Benefits Disclosure [Line Items]
Plan amendments		0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid		$ 5	$ 4

Employee Benefit Plans (Changes

Employee Benefit Plans (Changes in Projected Benefit Obligations, Plan Assets and Funded Status) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 2,618
Company contributions		$ 75
End balance	2,965	2,618
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	(85)	(80)
Other postretirement benefits	(661)	(629)
Accrued pensions	(745)	(645)
Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	3,100	3,462
Service cost	23	28	$ 33
Interest cost	105	97	98
Actuarial losses (gains) - net	449	(246)
Benefits paid	(144)	(125)
Plan transfers	0	8
Foreign currency translation adjustments	34	(88)
Settlements and curtailments	(4)	(24)
Other	(2)	4
Projected benefit obligation, End of year	3,561	3,100	3,462
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,618	2,883
Actual return on plan assets	409	(135)
Company contributions	13	99
Benefits paid	(111)	(102)
Plan settlements	(4)	(24)
Foreign currency translation adjustments	42	(95)
Other	(2)	(8)
End balance	2,965	2,618	2,883
Funded Status	(596)	(482)
Amounts recognized in the Consolidated Balance Sheet:
Other assets (long-term)	183	189
Accounts payable and accrued liabilities	(34)	(26)
Accrued pensions	(745)	(645)
Net liability recognized	(596)	(482)
Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	681	753
Service cost	8	10	10
Interest cost	26	24	24
Plan amendments	(17)	0
Actuarial losses (gains) - net	60	(47)
Benefits paid	(49)	(49)
Foreign currency translation adjustments	4	(8)
Other	(1)	(2)
Projected benefit obligation, End of year	712	681	753
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	(51)	(52)
Other postretirement benefits	(661)	(629)
Net liability recognized	(712)	(681)
United States
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Company contributions	0	75	54
United States | Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	1,582	1,706
Service cost	13	17
Interest cost	64	57
Actuarial losses (gains) - net	263	(129)
Benefits paid	(80)	(70)
Plan transfers	0	0
Foreign currency translation adjustments	0	0
Settlements and curtailments	0	0
Other	0	1
Projected benefit obligation, End of year	1,842	1,582	1,706
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,140	1,196
Actual return on plan assets	219	(82)
Company contributions	0	75
Benefits paid	(55)	(49)
Plan settlements	0	0
Foreign currency translation adjustments	0	0
Other	0	0
End balance	1,304	1,140	1,196
Funded Status	(538)	(442)
Amounts recognized in the Consolidated Balance Sheet:
Other assets (long-term)	0	0
Accounts payable and accrued liabilities	(26)	(18)
Accrued pensions	(512)	(424)
Net liability recognized	(538)	(442)
United States | Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	587	641
Service cost	8	9
Interest cost	23	21
Plan amendments	(17)	0
Actuarial losses (gains) - net	59	(38)
Benefits paid	(44)	(45)
Foreign currency translation adjustments	0	0
Other	0	(1)
Projected benefit obligation, End of year	616	587	641
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	(46)	(48)
Other postretirement benefits	(570)	(539)
Net liability recognized	(616)	(587)
International
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Company contributions	13	24	33
International | Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	1,518	1,756
Service cost	10	11
Interest cost	41	40
Actuarial losses (gains) - net	186	(117)
Benefits paid	(64)	(55)
Plan transfers	0	(8)
Foreign currency translation adjustments	34	(88)
Settlements and curtailments	(4)	(24)
Other	(2)	3
Projected benefit obligation, End of year	1,719	1,518	1,756
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,478	1,687
Actual return on plan assets	190	(53)
Company contributions	13	24
Benefits paid	(56)	(53)
Plan settlements	(4)	(24)
Foreign currency translation adjustments	42	(95)
Other	(2)	(8)
End balance	1,661	1,478	1,687
Funded Status	(58)	(40)
Amounts recognized in the Consolidated Balance Sheet:
Other assets (long-term)	183	189
Accounts payable and accrued liabilities	(8)	(8)
Accrued pensions	(233)	(221)
Net liability recognized	(58)	(40)
International | Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, Beginning of year	94	112
Service cost	0	1
Interest cost	3	3
Plan amendments	0	0
Actuarial losses (gains) - net	1	(9)
Benefits paid	(5)	(4)
Foreign currency translation adjustments	4	(8)
Other	(1)	(1)
Projected benefit obligation, End of year	96	94	$ 112
Amounts recognized in the Consolidated Balance Sheet:
Accounts payable and accrued liabilities	(5)	(4)
Other postretirement benefits	(91)	(90)
Net liability recognized	$ (96)	$ (94)

Employee Benefit Plans (Accumul

Employee Benefit Plans (Accumulated Other Comprehensive Loss Pretax Amounts Not Yet Reflected in Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated net actuarial losses	$ 920	$ 800
Accumulated prior service cost (credit)	2	2
Total	922	802
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated net actuarial losses	166	113
Accumulated prior service cost (credit)	(138)	(178)
Total	$ 28	$ (65)

Employee Benefit Plans (Change

Employee Benefit Plans (Change in Accumulated Other Comprehensive Loss (Pretax) Relating to Defined Benefit Pension and Other Postretirement Benefits) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss arising during the year	$ 60
New prior service credit	(17)
Amortization of actuarial loss	8	$ 19	$ 12
Amortization of prior service credit	57	60	59
Foreign currency translation adjustments	1
Impact of settlements and curtailments	0
Net change	93
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss arising during the year	179
New prior service credit	0
Amortization of actuarial loss	62	$ 63	$ 75
Amortization of prior service credit	0
Foreign currency translation adjustments	5
Impact of settlements and curtailments	(2)
Net change	$ 120

Employee Benefit Plans (Net Per

Employee Benefit Plans (Net Periodic Benefit Costs) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 10	$ 10
Interest cost	26	24	24
Amortization of prior service credit	(57)	(60)	(59)
Amortization of actuarial losses	8	19	12
Net periodic benefit cost/(income)	(15)	(7)	(13)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	23	28	33
Interest cost	105	97	98
Expected return on plan assets	139	150	141
Amortization of prior service credit	0
Amortization of actuarial losses	62	63	75
Settlements, curtailments, and special termination benefits	3	5	60
Net periodic benefit cost/(income)	$ 54	$ 43	$ 125

Employee Benefit Plans (Weighte

Employee Benefit Plans (Weighted Average Assumptions Used to Determine Benefit Obligation for Defined Benefit Pension and Other Postretirement Plans) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate benefit obligation	2.80%	3.70%
Rate of compensation increase	2.60%	1.20%
Return on plan assets assumption	5.40%	5.40%	5.40%
Impact on Net Periodic Pension Expense - Next Twelve Months	$ 13
United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate benefit obligation	3.30%	4.40%
Rate of compensation increase	2.50%	1.50%
Return on plan assets assumption	7.40%
International
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to calculate benefit obligation	2.20%	2.90%
Rate of compensation increase	2.80%	0.90%

Employee Benefit Plans (Weigh_2

Employee Benefit Plans (Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost for Defined Benefit Pension and Other Postretirement Plans) (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate used to calculate benefit obligation	2.80%	3.70%
Discount rate	3.70%	3.20%	3.60%
Expected return on assets	5.40%	5.40%	5.40%
Rate of compensation increase	1.80%	1.20%	1.30%
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate used to calculate benefit obligation	3.30%	4.40%
Expected return on assets	7.40%

Employee Benefit Plans (Weigh_3

Employee Benefit Plans (Weighted Average Target Pension Plan Asset Allocations) (Detail)	Dec. 31, 2019	Dec. 31, 2018
Minimum | Equity Securities
Asset Category
Weighted average target pension plan asset allocation, minimum	15.00%	15.00%
Minimum | Debt securities
Asset Category
Weighted average target pension plan asset allocation, minimum	30.00%	30.00%
Minimum | Real Estate
Asset Category
Weighted average target pension plan asset allocation, minimum	0.00%	0.00%
Minimum | Other
Asset Category
Weighted average target pension plan asset allocation, minimum	20.00%	20.00%
Maximum | Equity Securities
Asset Category
Weighted average target pension plan asset allocation, minimum	45.00%	45.00%
Maximum | Debt securities
Asset Category
Weighted average target pension plan asset allocation, minimum	65.00%	65.00%
Maximum | Real Estate
Asset Category
Weighted average target pension plan asset allocation, minimum	10.00%	10.00%
Maximum | Other
Asset Category
Weighted average target pension plan asset allocation, minimum	40.00%	40.00%

Employee Benefit Plans (Fair Va

Employee Benefit Plans (Fair Values of the Company's Pension Plan Assets by Asset Category) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	$ 2,965	$ 2,618
Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	2,252	1,961
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	324	252
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	1,093	914
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	835	795	$ 1,002
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	713	657
Defined Benefit Plan, Equity Securities, US, Large Cap | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	138	137
Defined Benefit Plan, Equity Securities, US, Large Cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	58	43
Defined Benefit Plan, Equity Securities, US, Large Cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	80	94
Defined Benefit Plan, Equity Securities, US, Large Cap | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Defined Benefit Plan, Equity Securities, US, Small Cap | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	41	23
Defined Benefit Plan, Equity Securities, US, Small Cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	41	23
Defined Benefit Plan, Equity Securities, US, Small Cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Defined Benefit Plan, Equity Securities, US, Small Cap | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Defined Benefit Plan, Equity Securities, Non-US | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	227	218
Defined Benefit Plan, Equity Securities, Non-US | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	143	115
Defined Benefit Plan, Equity Securities, Non-US | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	84	103
Defined Benefit Plan, Equity Securities, Non-US | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Defined Benefit Plan, Cash and Cash Equivalents | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	26	22
Defined Benefit Plan, Cash and Cash Equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	10	3
Defined Benefit Plan, Cash and Cash Equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	16	19
Defined Benefit Plan, Cash and Cash Equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Debt Security, Corporate, US | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	414	297
Debt Security, Corporate, US | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Debt Security, Corporate, US | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	337	220
Debt Security, Corporate, US | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	77	77
Debt Security, Developed Markets And Emerging Economies | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	2	4
Debt Security, Developed Markets And Emerging Economies | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Debt Security, Developed Markets And Emerging Economies | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	2	4
Debt Security, Developed Markets And Emerging Economies | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Debt Security, Diverse Portfolio | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	237	142
Debt Security, Diverse Portfolio | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Debt Security, Diverse Portfolio | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	237	142
Debt Security, Diverse Portfolio | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
US Government Agencies Debt Securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	81	76
US Government Agencies Debt Securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	72	68
US Government Agencies Debt Securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	9	8
US Government Agencies Debt Securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Developed Markets, Government Agencies Debt Securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	7	6
Developed Markets, Government Agencies Debt Securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Developed Markets, Government Agencies Debt Securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	7	6
Developed Markets, Government Agencies Debt Securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Other | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	395	373
Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	18	14
Other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	377	359
Defined Benefit Plan, Real Estate, Hedge Funds, And Other [Member] | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	684	663
Defined Benefit Plan, Real Estate, Hedge Funds, And Other [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0	0
Defined Benefit Plan, Real Estate, Hedge Funds, And Other [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	303	304
Defined Benefit Plan, Real Estate, Hedge Funds, And Other [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	$ 381	$ 359

Employee Benefit Plans (Chang_2

Employee Benefit Plans (Change in Fair Value of Company's Level 3 Pension Assets) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 2,618
End balance	2,965	$ 2,618
Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	795	1,002
Realized gains/(losses)	53	(10)
Unrealized losses	8	(28)
Transfers out, net	(22)	(137)
Foreign currency losses	1	(32)
End balance	835	795
Level 3 | Real Estate
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	137	138
Realized gains/(losses)	18	9
Unrealized losses	(7)	0
Transfers out, net	(27)	(6)
Foreign currency losses	2	(4)
End balance	123	137
Level 3 | Other Debt Securities
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	359	418
Realized gains/(losses)	38	(29)
Unrealized losses	0	0
Transfers out, net	(12)	(12)
Foreign currency losses	(8)	(18)
End balance	377	359
Level 3 | Hedge Funds and Other Assets
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	299	446
Realized gains/(losses)	(3)	10
Unrealized losses	15	(28)
Transfers out, net	17	(119)
Foreign currency losses	7	(10)
End balance	$ 335	$ 299

Employee Benefit Plans (Other P

Employee Benefit Plans (Other Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined contribution plan contribution rates as percentage of employee earnings	6.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Compensation expense related to the ESOP	$ 49	$ 47	$ 46
Deductible dividends on PPG shares held by the ESOP	11	13	14
Recognized expense for defined contribution pension plans	70	63	57
Expense (income) of the deferred compensation plan	21	(1)	19
Increase (Decrease) in fair value of investments	20	(2)	$ 18
Obligations under the deferred compensation plan	123	110
Investments in marketable securities by the deferred compensation plan	$ 85	$ 73

Commitments and Contingent Li_3

Commitments and Contingent Liabilities (Litigation Settlements - Asbestos Matters and Other Disclosure) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Litigation Settlement, Amount Awarded to Other Party	$ 25
Other Reserves	190
Insurance Settlements Receivable, Current	25
Stockholders' Equity, Other	$ 1
Asbestos Issue
Loss Contingency, Pending Claims, Number	605
Other Reserves	$ 162
Increase to asbestos reserve	$ 10
Pittsburgh Corning Corporation
Ownership interest	50.00%

Commitments and Contingent Li_4

Commitments and Contingent Liabilities (Additional Information - Environmental Matters) (Detail) $ in Millions	12 Months Ended				48 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)Location	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2024USD ($)	Jun. 30, 2009Location
Environmental Matters [Abstract]
Reserves for environmental contingencies		$ 304	$ 291
Reserves for environmental contingencies classified as current liabilities		62	105
Pretax charges for environmental remediation costs		77	78	$ 10
Cash outlays related to environmental remediation		77	64	44
Historical low end of range of annual environmental remediation expense over the past 15 years		5
Historical high end of range of annual environmental remediation expense over the past 15 years		$ 35
Remediation Period		10 years
Scenario, Forecast | Maximum
Environmental Matters [Abstract]
Cash For Environmental Loss Contingencies High Estimate	$ 100				$ 50
Unreserved loss contingencies related to environmental matters, high estimate	200
Scenario, Forecast | Minimum
Environmental Matters [Abstract]
Cash For Environmental Loss Contingencies Low Estimate	80				$ 20
Unreserved loss contingencies related to environmental matters, high estimate	$ 100
Excavation of Soil
Environmental Matters [Abstract]
Percentage of the total remaining reserve		20.00%
Soil Treatment Transportation And Disposal Of Excavated Soil
Environmental Matters [Abstract]
Percentage of the total remaining reserve		14.00%
Construction Services
Environmental Matters [Abstract]
Percentage of the total remaining reserve		28.00%
Jersey City Manufacturing Plant
Environmental Matters [Abstract]
Reserves for environmental contingencies		$ 134	151
Pretax charges for environmental remediation costs		43	62	4
Glass and Chemical Sites
Environmental Matters [Abstract]
Reserves for environmental contingencies		96	90
Other Environmental Contingencies
Environmental Matters [Abstract]
Reserves for environmental contingencies		74	50
Pretax charges for environmental remediation costs		$ 34	$ 16	$ 6
Judicial Consent Order
Environmental Matters [Abstract]
Number Of Sites Involved For Environmental Remediation | Location		19				20

Shareholders' Equity (Summary o

Shareholders' Equity (Summary of Shares Outstanding) (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shareholders' Equity Note [Line Items]
Common Stock, Par or Stated Value Per Share	$ 1.667
Preferred stock without par value (in dollars per share)	$ 10,000,000
Shares of common stock authorized	1,200,000,000
Per share cash dividends paid (in dollars per share)	$ 1.98	$ 1.86	$ 1.70
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	235,861,434	251,174,399	257,330,160
Purchases (in shares)	(2,722,800)	(15,877,364)	(7,427,557)
Issuances (in shares)	2,541,836	564,399	1,271,796
Ending balance (in shares)	235,680,470	235,861,434	251,174,399
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	581,146,136	581,146,136	581,146,136
Ending balance (in shares)	581,146,136	581,146,136	581,146,136
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	345,284,702	329,971,737	323,815,976
Purchases (in shares)	(2,722,800)	(15,877,364)	(7,427,557)
Issuances (in shares)	2,541,836	564,399	1,271,796
Ending balance (in shares)	345,465,666	345,284,702	329,971,737

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	$ 1	$ 2	$ 5
Beginning Balance	(2,300)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	71	(292)	542
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(130)	129	(295)
Reclassifications of Temporary to Permanent Equity	0
Net change	(51)	(147)	316
Ending Balance	(2,350)	(2,300)
Unrealized Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,734)	(1,567)	(1,798)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	71	(292)	542
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	36	148	(311)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Reclassifications of Temporary to Permanent Equity		23
Net change		(144)	231
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	107
Ending Balance	(1,627)	(1,734)	(1,567)
Pension and Other Post retirement Benefit Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(568)	(493)	(571)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(167)	(12)	20
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	11	21	58
Reclassifications of Temporary to Permanent Equity		84
Net change	(156)	9	78
Ending Balance	(724)	(568)	(493)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications of Temporary to Permanent Equity		0
Accumulated Other Comprehensive (Loss)/Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications of Temporary to Permanent Equity		107
Net change	(50)	(136)	299
Unrealized Gain (Loss) on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2	3	13
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1	(7)	(4)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(2)	6	(6)
Net change	(1)	(1)	(10)
Ending Balance	1	2	3
Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,300)	(2,057)	(2,356)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	9	27	52
Reclassifications of Temporary to Permanent Equity	0
Net change	(50)	(136)	299
Ending Balance	$ (2,350)	$ (2,300)	$ (2,057)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss (Additional Information) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 7	$ 9
Tax benefit (cost) related to unrealized currency translation adjustments other than translation of foreign denominated balance sheets	(19)	4	$ 141
Tax benefit (cost) related to the adjustment for pension and other postretirement benefits	57	(34)	(33)
Cumulative tax benefit related to the adjustment for pension and other postretirement benefits	266	209
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	$ 1	$ 2	$ 5

Other Income (Detail)

Other Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Gain on sale of assets	$ 7	$ 33	$ 28
Royalty income	8	10	11
Share of net earnings of equity affiliates (See Note 6)	11	16	12
Gain on disposal of ownership interest in business affiliate	0	0	25
Income from a legal settlement	0	0	18
Other	63	55	56
Total	89	114	150
Gain on sale of land	$ 0	$ (26)	$ 0

Stock-Based Compensation (Addit

Stock-Based Compensation (Additional Information) (Detail) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)target$ / sharesshares	Dec. 31, 2018USD ($)$ / shares	Dec. 31, 2017USD ($)$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Terms	The options are generally exercisable 36 months after being granted and have a maximum term of 10 years.
Shares available for future grants under the PPG Omnibus Plan | shares	6.7
Stock-based compensation expense | $	$ 39	$ 37	$ 35
Total income tax benefit recognized related to the stock-based compensation | $	$ 9	$ 8	$ 12
Maximum term of the outstanding stock options for the PPG Omnibus Plan and the PPG Stock Plan for certain employees	10 years
Weighted average fair value of options granted (in dollars per share) | $ / shares	$ 22.50	$ 25.27	$ 21.15
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	36 months
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost that have not yet vested | $	$ 7
Cost not yet recognized, period for recognition	1 year 6 months
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost that have not yet vested | $	$ 17
Cost not yet recognized, period for recognition	1 year 8 months 12 days
Award vesting period	3 years
Percentage of the target award that is assumed to vest for the purposes of expense recognition	100.00%
Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of the target award that is paid based on performance	0.00%	0.00%	0.00%
Restricted Stock Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of the target award that is paid based on performance	180.00%	180.00%	180.00%
Restricted Stock Units (RSUs) | Performance Period 2017 to 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance targets met	3
Number of performance targets	6
Restricted Stock Units (RSUs) | Performance Period 2018 to 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance targets met	2
Number of performance targets	4
Restricted Stock Units (RSUs) | Performance Period 2019 to 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance targets met	1
Number of performance targets	2
Contingent Share Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost that have not yet vested | $	$ 6
Cost not yet recognized, period for recognition	1 year 8 months 12 days		3 years
Award vesting period		3 years
Earned payout if the target performance is achieved	100.00%
Contingent Share Grants | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of the target award that is paid based on performance	0.00%	0.00%	0.00%
Contingent Share Grants | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of the target award that is paid based on performance	220.00%	220.00%	220.00%

Stock-Based Compensation (Weigh

Stock-Based Compensation (Weighted Average Assumptions Used in Calculating Fair Value of Stock Option) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Weighted average exercise price	$ 109.74	$ 115.98	$ 101.53
Risk free interest rate	2.60%	2.90%	2.40%
Expected life of option in years	6 years 6 months	6 years 6 months	6 years 6 months
Expected dividend yield	1.60%	1.70%	1.80%
Expected volatility	20.00%	21.00%	22.00%

Stock-Based Compensation (Stock

Stock-Based Compensation (Stock Options Outstanding, Exercisable and Activity) (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Beginning Balance	3,761,000
Granted	588,870
Exercised	(832,177)
Forfeited/Expired	(107,940)
Ending Balance	3,409,753	3,761,000
Vested or expected to vest, at end of period	3,312,698
Exercisable, at end of period	1,819,591
Weighted Average Exercise Price
Beginning Balance (in dollars per share)	$ 90.10
Granted (in dollars per share)	109.74
Exercised (in dollars per share)	73.78
Forfeited/Expired (in dollars per share)	107.41
Ending Balance (in dollars per share)	96.93	$ 90.10
Vested or expected to vest, at end of period (in dollars per share)	96.54
Exercisable, at end of period (in dollars per share)	$ 86.67
Weighted Average Remaining Contractual Life (in years)
Outstanding	6 years 1 month 6 days	6 years 1 month 6 days
Vested or expected to vest, at end of period	6 years 1 month 6 days
Exercisable, at end of period	4 years 4 months 24 days
Intrinsic Value (in millions)
Outstanding	$ 125	$ 61
Vested or expected to vest, at end of period	122
Exercisable, at end of period	$ 85

Stock-Based Compensation (Sto_2

Stock-Based Compensation (Stock Option Activity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Total intrinsic value of stock options exercised	$ 38	$ 19	$ 40
Cash received from stock option exercises	61	15	52
Income tax benefit from the exercise of stock options	9	4	15
Total fair value of stock options vested	$ 12	$ 10	$ 13

Stock-Based Compensation (RSU A

Stock-Based Compensation (RSU Activity) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance	631,731
Granted	241,113
Released from restrictions	(229,238)
Forfeited	(32,064)
Ending Balance	611,542
Vested or expected vest, at end of period	580,878
Weighted Average Fair Value
Beginning Balance (in dollars per share)	$ 102.80
Granted (in dollars per share)	111.25
Released from restrictions (in dollars per share)	100.98
Forfeited (in dollars per share)	109.34
Ending Balance (in dollars per share)	109.30
Vested or expected to vest, at end of period (in dollars per share)	$ 109.17
Intrinsic Value (in millions)
Outstanding	$ 67	$ 65
Vested or expected to vest, at end of period	$ 63

Quarterly Financial Informati_3

Quarterly Financial Information Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 3,672	$ 3,826	$ 4,024	$ 3,624	$ 3,645	$ 3,817	$ 4,131	$ 3,781	$ 15,146	$ 15,374	$ 14,748
Cost of sales, exclusive of depreciation and amortization	2,111	2,181	2,288	2,073	2,188	2,253	2,379	2,181	8,653	9,001	8,209
Income from continuing operations, net of tax	295	366	270	312	256	368	371	328	1,243	1,323	1,369
Income from discontinued operations, net of tax	(3)	1	2	0	2	10	0	6	0	18	225
Net income (loss) attributable to parent	$ 292	$ 367	$ 272	$ 312	$ 258	$ 378	$ 371	$ 334	$ 1,243	$ 1,341	$ 1,594
Continuing operations (in dollars per share)	$ 1.24	$ 1.55	$ 1.14	$ 1.32	$ 1.07	$ 1.52	$ 1.51	$ 1.32	$ 5.25	$ 5.43	$ 5.34
Discontinued operations (in dollars per share)	(0.01)	0	0.01	0	0.01	0.04	0	0.02	0	0.07	0.88
Net Income (attributable to PPG) (in dollars per share)	1.23	1.55	1.15	1.32	1.08	1.56	1.51	1.34	5.25	5.50	6.22
Continuing operations (in dollars per share)	1.23	1.54	1.13	1.31	1.07	1.51	1.51	1.31	5.22	5.40	5.31
Discontinued operations (in dollars per share)	(0.01)	0	0.01	0	0.01	0.04	0	0.02	0	0.07	0.87
Earnings per common share - assuming dilution (in dollars per share)	$ 1.22	$ 1.54	$ 1.14	$ 1.31	$ 1.08	$ 1.55	$ 1.51	$ 1.33	$ 5.22	$ 5.47	$ 6.18

Revenue Recognition Schedule Of

Revenue Recognition Schedule Of Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 3,672	$ 3,826	$ 4,024	$ 3,624	$ 3,645	$ 3,817	$ 4,131	$ 3,781	$ 15,146	$ 15,374	$ 14,748
United States and Canada
Disaggregation of Revenue [Line Items]
Net sales									6,475	6,485	6,307
EMEA
Disaggregation of Revenue [Line Items]
Net sales									4,549	4,678	4,389
Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales									2,542	2,618	2,523
Latin America
Disaggregation of Revenue [Line Items]
Net sales									1,580	1,593	1,529
Performance Coatings
Disaggregation of Revenue [Line Items]
Net sales									9,034	9,087	8,730
Performance Coatings | United States and Canada
Disaggregation of Revenue [Line Items]
Net sales									4,057	4,062	4,031
Performance Coatings | EMEA
Disaggregation of Revenue [Line Items]
Net sales									2,869	2,936	2,761
Performance Coatings | Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales									1,095	1,071	970
Performance Coatings | Latin America
Disaggregation of Revenue [Line Items]
Net sales									1,013	1,018	968
Industrial Coatings
Disaggregation of Revenue [Line Items]
Net sales									6,112	6,287	6,018
Industrial Coatings | United States and Canada
Disaggregation of Revenue [Line Items]
Net sales									2,418	2,423	2,276
Industrial Coatings | EMEA
Disaggregation of Revenue [Line Items]
Net sales									1,680	1,742	1,628
Industrial Coatings | Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales									1,447	1,547	1,553
Industrial Coatings | Latin America
Disaggregation of Revenue [Line Items]
Net sales									$ 567	$ 575	$ 561
Revenue from Contract with Customer | Service [Member]
Disaggregation of Revenue [Line Items]
Service revenue, percentage of total revenue									5.00%

Reportable Business Segment I_3

Reportable Business Segment Information (Reportable Segment Information) (Detail)	12 Months Ended
	Dec. 31, 2019Segment
Segment Reporting [Abstract]
Number of PPG operating segments	9
Number of PPG reportable business segments, based on economic similarities, the nature of their products, production processes, end-use markets and methods of distribution	2

Reportable Business Segment I_4

Reportable Business Segment Information (Reportable Segment Tables) (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Total Net sales	$ 3,672	$ 3,826	$ 4,024	$ 3,624	$ 3,645	$ 3,817	$ 4,131	$ 3,781	$ 15,146	$ 15,374	$ 14,748
Total Segment income									2,271	2,118	2,292
Legacy items									(1)	5	(2)
Restructuring Costs									(222)	(75)	0
Environmental remediation charges and other costs, net									(61)	(77)	0
Transaction-related costs									(17)	(6)	(9)
Legacy legal settlement									(12)	(24)	18
Impairment of a non-manufacturing asset									0	(9)	0
Costs related to customer assortment changes									0	(18)	0
Gain from the sale of non-operating assets									0	26	13
Brand rationalization charge									0	(6)	0
Asset write-downs									0	0	(7)
Pension settlement charge									0	0	(60)
Gain on disposal of ownership interest in business affiliate									0	0	25
Interest expense, net of interest income									(100)	(95)	(85)
Corporate unallocated									(197)	(146)	(180)
Total Income before income taxes									1,661	1,693	2,005
Depreciation and amortization									511	497	460
Share of net earnings of equity affiliates									11	16	12
Segment assets	17,708				16,015				17,708	16,015	16,538
Investment in equity affiliates	129				132				129	132	134
Expenditures for property (including business acquisitions)									1,056	789	685
Performance Coatings Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Total Net sales									9,034	9,087	8,730
Total Segment income									1,409	1,300	1,313
Depreciation and amortization									255	274	272
Share of net earnings of equity affiliates									1	1	2
Segment assets	10,636				9,846				10,636	9,846	9,763
Investment in equity affiliates	33				33				33	33	32
Expenditures for property (including business acquisitions)									483	545	224
Industrial Coatings Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Total Net sales									6,112	6,287	6,018
Total Segment income									862	818	979
Depreciation and amortization									194	181	164
Share of net earnings of equity affiliates									0	0	0
Segment assets	4,912				4,441				4,912	4,441	4,563
Investment in equity affiliates	14				13				14	13	13
Expenditures for property (including business acquisitions)									510	157	328
Corporate, Non-Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization									62	42	24
Share of net earnings of equity affiliates									10	15	10
Segment assets	2,160				1,728				2,160	1,728	2,212
Investment in equity affiliates	$ 82				$ 86				82	86	89
Expenditures for property (including business acquisitions)									63	87	133
Mexican Plaka Business
Segment Reporting, Revenue Reconciling Item [Line Items]
Gain on disposal of ownership interest in business affiliate									$ 0	$ 0	$ 25

Reportable Business Segment I_5

Reportable Business Segment Information (Geographic Information) (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 3,672	$ 3,826	$ 4,024	$ 3,624	$ 3,645	$ 3,817	$ 4,131	$ 3,781	$ 15,146	$ 15,374	$ 14,748
Segment income									2,271	2,118	2,292
Property, plant and equipment, net	2,983				2,805				2,983	2,805	2,824
United States and Canada
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales									6,475	6,485	6,307
Segment income									1,073	1,022	1,135
Property, plant and equipment, net	1,300				1,254				1,300	1,254	1,224
Europe, Middle East and Africa (“EMEA”)
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales									4,549	4,678	4,389
Segment income									569	549	560
Property, plant and equipment, net	836				777				836	777	826
Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales									2,542	2,618	2,523
Segment income									342	306	361
Property, plant and equipment, net	538				482				538	482	493
Latin America
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales									1,580	1,593	1,529
Segment income									287	241	236
Property, plant and equipment, net	$ 309				$ 292				$ 309	$ 292	$ 281

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	Schedule II – Valuation and Qualifying Accounts Allowance for Doubtful Accounts for the Years Ended December 31, 2019 , 2018 , and 2017 ($ in millions) Balance at Beginning of Year Charged to Costs and Expenses Deductions(1) Balance at End of Year 2019 $24 $24 ($26 ) $22 2018 $25 $18 ($19 ) $24 2017 $36 $15 ($26 ) $25 (1) Notes and accounts receivable written off as uncollectible, net of recoveries, amounts attributable to divestitures and changes attributable to foreign currency translation.
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 164
Balance at End of Year	158	$ 164
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	24	25	$ 36
Charged to Costs and Expenses	24	18	15
Deductions	(26)	(19)	(26)
Balance at End of Year	$ 22	$ 24	$ 25