| Pay vs Performance Disclosure | 12 Months Ended |
| Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares |
| Pay vs Performance Disclosure | | | | |
| Pay vs Performance Disclosure, Table | AVERAGE AVERAGE SELECTED SUMMARY COMP. VALUE OF INITIAL FIXED $100 MEASURE: COMP. TABLE ACTUALLY PAID INVESTMENT BASED ON: ADJUSTED SUMMARY COMP. TOTAL FOR TO NON-PEO PEER GROUP (3) EARNINGS COMP. TABLE ACTUALLY NON-PEO NAMED NAMED TOTAL TOTAL NET PER TOTAL FOR PAID TO EXECUTIVE EXECUTIVE SHAREHOLDER SHAREHOLDER INCOME DILUTED YEAR PEO (1) PEO (1) OFFICERS (2) OFFICERS (2) RETURN RETURN (in millions) SHARE 2023 $ 6,900,724 $ 10,399,261 $ 3,277,495 $ 4,865,611 $ 120 $ 120 $ 1,270 $ 7.50 2022 $ 8,867,377 $ 238,659 $ 2,280,483 $ (26,911) $ 99 $ 101 $ 1,028 $ 6.22 2021 $ 13,199,616 $ 22,568,453 $ 3,035,088 $ 5,267,224 $ 133 $ 135 $ 1,420 $ 6.77 2020 $ 15,903,993 $ 16,689,353 $ 3,607,399 $ 3,526,539 $ 110 $ 112 $ 1,056 $ 6.12 (1) The principal executive officer was Mr. McGarry for years 2020-2022 and Mr. Knavish was principle executive officer for 2023. (2) The non-principal executive officer named executive officers were Mr. Morales, Mr. Knavish, Ms. Liebert and Ms. Foulkes for years 2020-2022. For 2023 the non-principal executive officer named executive officers were Mr. McGarry, Mr. Morales, Ms. Foulkes and Mr. Vadlamannati. Ms. Ericson was included as a non-principal executive officer named executive officer for 2023. (3) The peer group consists of: 3M Co., Akzo Nobel N.V., Axalta Coatings Systems Ltd., Dow, Inc., Dupont de Nemours, Inc., Eastman Chemical Co., Masco Corp., RPM International Inc., and The Sherwin-Williams Co. See Exhibit 13.1 of our Form 10-K for the year ended December 31, 2022. | | | |
| Company Selected Measure Name | Adjusted earnings per diluted share | | | |
| Named Executive Officers, Footnote | (1) The principal executive officer was Mr. McGarry for years 2020-2022 and Mr. Knavish was principle executive officer for 2023. (2) The non-principal executive officer named executive officers were Mr. Morales, Mr. Knavish, Ms. Liebert and Ms. Foulkes for years 2020-2022. For 2023 the non-principal executive officer named executive officers were Mr. McGarry, Mr. Morales, Ms. Foulkes and Mr. Vadlamannati. Ms. Ericson was included as a non-principal executive officer named executive officer for 2023. | | | |
| Peer Group Issuers, Footnote | (3) The peer group consists of: 3M Co., Akzo Nobel N.V., Axalta Coatings Systems Ltd., Dow, Inc., Dupont de Nemours, Inc., Eastman Chemical Co., Masco Corp., RPM International Inc., and The Sherwin-Williams Co. See Exhibit 13.1 of our Form 10-K for the year ended December 31, 2022. | | | |
| PEO Total Compensation Amount | $ 6,900,724 | $ 8,867,377 | $ 13,199,616 | $ 15,903,993 |
| PEO Actually Paid Compensation Amount | $ 10,399,261 | 238,659 | 22,568,453 | 16,689,353 |
| Adjustment To PEO Compensation, Footnote | A reconciliation of PEO SCT total compensation to CAP is provided in the following table. PEO SCT Total Compensation to CAP Reconciliation (2021-20223 PLUS CHANGE FROM BOY TO PLUS CHANGE PLUS EOY EOY IN FAIR IN FAIR VALUE FAIR VALUE VALUE OF FROM BOY TO OF EQUITY AWARDS VESTING DATE AWARDS GRANTED IN OF AWARDS GRANTED ANY PRIOR GRANTED IN PLUS DURING YEAR YEAR ANY PRIOR MINUS SCT PENSION THAT ARE THAT ARE YEAR THAT SCT CHANGE IN VALUE OUTSTANDING OUTSTANDING VESTED TOTAL FOR PENSION SERVICE MINUS SCT AND UNVESTED AND UNVESTED DURING PEO YEAR PEO VALUE COST EQUITY AT EOY AT EOY THE YEAR CAP 2023 $ 6,900,724 $ (711,688) $ — $ (4,898,968) $ 5,161,497 $ 2,019,787 $ 1,927,910 $ 10,399,261 2022 $ 8,867,377 $ 4,368,862 $ — $ (10,000,026) $ 7,834,096 $ (4,197,554) $ (6,634,096) $ 238,659 2021 $ 13,199,616 $ 218,598 $ — $ (9,400,002) $ 10,917,328 $ 4,275,913 $ 3,357,000 $ 22,568,453 2020 $ 15,903,993 $ (4,289,632) $ 180,279 $ (8,249,709) $ 11,073,569 $ 1,559,781 $ 511,072 $ 16,689,353 "EOY" = end of Year; "BOY" = Beginning of Year | | | |
| Non-PEO NEO Average Total Compensation Amount | $ 3,277,495 | 2,280,483 | 3,035,088 | 3,607,399 |
| Non-PEO NEO Average Compensation Actually Paid Amount | $ 4,865,611 | (26,911) | 5,267,224 | 3,526,539 |
| Adjustment to Non-PEO NEO Compensation Footnote | A reconciliation of average non-PEO SCT total compensation to CAP is provided in the following table. Average Non-PEO NEOs SCT Total Compensation to CAP Reconciliation (2021-20223 PLUS CHANGE FROM BOY TO PLUS CHANGE MINUS FAIR PLUS EOY EOY IN FAIR IN FAIR VALUE VALUE AT FAIR VALUE VALUE OF FROM BOY TO BOY OF OF EQUITY AWARDS VESTING DATE AWARDS AWARDS GRANTED IN OF AWARDS GRANTED GRANTED ANY PRIOR GRANTED IN IN PRIOR PLUS DURING YEAR YEAR ANY PRIOR YEAR THAT SCT MINUS SCT PENSION THAT ARE THAT ARE YEAR THAT WERE TOTAL FOR CHANGE IN VALUE OUTSTANDING OUTSTANDING VESTED FORFEITED NON-PEO NON-PEO PENSION SERVICE MINUS SCT AND UNVESTED AND UNVESTED DURING DURING NEOs YEAR NEOs VALUE COST EQUITY AT EOY AT EOY THE YEAR THE YEAR CAP 2023 $ 3,277,495 $ (245,779) $ — $ (2,279,917) $ 2,546,287 $ 753,488 $ 814,038 $ — $ 4,865,611 2022 $ 2,280,483 $ 846,793 $ — $ (1,970,003) $ 1,253,448 $ (546,994) $ (815,908) $ (1,074,730) $ (26,911) 2021 $ 3,035,088 $ 105,473 $ — $ (1,724,948) $ 2,003,403 $ 1,388,365 $ 459,843 $ — $ 5,267,224 2020 $ 3,607,399 $ (995,665) $ 117,478 $ (1,399,950) $ 1,879,152 $ 201,719 $ 116,406 $ — $ 3,526,539 "EOY" = end of Year; "BOY" = Beginning of Year | | | |
| Compensation Actually Paid vs. Total Shareholder Return | As shown in the chart below, the PEO and other NEOs’ CAP amounts are aligned with the Company’s TSR. This is due primarily to the Company’s use of equity incentives, which are tied directly to stock price in addition to the Company’s financial performance. | | | |
| Compensation Actually Paid vs. Net Income | As shown in the chart below, the Company’s net income is aligned with the Company’s net income. This is due in large part to the significant emphasis the Company places on equity incentives, which are sensitive to changes in stock price. In addition, the Company does not use net income to determine compensation levels or incentive plan payouts. | | | |
| Compensation Actually Paid vs. Company Selected Measure | The chart below compares the PEO and the other non-PEO NEOs’ CAP to PPG’s company-selected measure, adjusted earnings per diluted share, which indicates there is a very strong relationship between adjusted earnings per diluted share and CAP. This is due primarily to the Company’s use of equity incentives, which are tied directly to stock price in addition to the Company’s financial performance. | | | |
| Total Shareholder Return Vs Peer Group | As shown in the chart below, the Company’s TSR performance for the immediately preceding three years was aligned with the companies included in the peer group, and when the six-year TSR is compared to peers, the Company has outperformed the peers. The peer group consists of: 3M Co., Akzo Nobel N.V., Axalta Coatings Systems Ltd., Dow, Inc., Dupont de Nemours, Inc., Eastman Chemical Co., Masco Corp., RPM International Inc., and The Sherwin-Williams Co. | | | |
| Tabular List, Table | The three items listed below represent the most important financial performance measures used by PPG to link compensation actually paid to our named executive officers for 2023 to the Company’s performance: MOST IMPORTANT PERFORMANCE MEASURES Adjusted earnings per diluted share Cash flow return on capital Total shareholder return | | | |
| Total Shareholder Return Amount | $ 120 | 99 | 133 | 110 |
| Peer Group Total Shareholder Return Amount | 120 | 101 | 135 | 112 |
| Net Income (Loss) | $ 1,270,000,000 | $ 1,028,000,000 | $ 1,420,000,000 | $ 1,056,000,000 |
| Company Selected Measure Amount | $ / shares | 7.50 | 6.22 | 6.77 | 6.12 |
| PEO Name | Mr. Knavish | | | |
| Measure:: 1 | | | | |
| Pay vs Performance Disclosure | | | | |
| Name | Adjusted earnings per diluted share | | | |
| Measure:: 2 | | | | |
| Pay vs Performance Disclosure | | | | |
| Name | Cash flow return on capital | | | |
| Measure:: 3 | | | | |
| Pay vs Performance Disclosure | | | | |
| Name | Total shareholder return | | | |
| PEO | MINUS SCT CHANGE IN PENSION VALUE | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | $ (711,688) | $ 4,368,862 | $ 218,598 | $ (4,289,632) |
| PEO | PLUS PENSION VALUE SERVICE COST | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | | | | 180,279 |
| PEO | MINUS SCT EQUITY | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | (4,898,968) | (10,000,026) | (9,400,002) | (8,249,709) |
| PEO | PLUS EOY FAIR VALUE OF EQUITY AWARDS GRANTED DURING YEAR THAT ARE OUTSTANDING AND UNVESTED AT EOY | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | 5,161,497 | 7,834,096 | 10,917,328 | 11,073,569 |
| PEO | PLUS CHANGE FROM BOY TO EOY IN FAIR VALUE OF AWARDS GRANTED IN ANY PRIOR YEAR THAT ARE OUTSTANDING AND UNVESTED AT EOY | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | 2,019,787 | (4,197,554) | 4,275,913 | 1,559,781 |
| PEO | PLUS CHANGE IN FAIR VALUE FROM BOY TO VESTING DATE OF AWARDS GRANTED IN ANY PRIOR YEAR THAT VESTED DURING THE YEAR | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | 1,927,910 | (6,634,096) | 3,357,000 | 511,072 |
| Non-PEO NEO | MINUS SCT CHANGE IN PENSION VALUE | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | (245,779) | 846,793 | 105,473 | (995,665) |
| Non-PEO NEO | PLUS PENSION VALUE SERVICE COST | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | | | | 117,478 |
| Non-PEO NEO | MINUS SCT EQUITY | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | (2,279,917) | (1,970,003) | (1,724,948) | (1,399,950) |
| Non-PEO NEO | PLUS EOY FAIR VALUE OF EQUITY AWARDS GRANTED DURING YEAR THAT ARE OUTSTANDING AND UNVESTED AT EOY | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | 2,546,287 | 1,253,448 | 2,003,403 | 1,879,152 |
| Non-PEO NEO | PLUS CHANGE FROM BOY TO EOY IN FAIR VALUE OF AWARDS GRANTED IN ANY PRIOR YEAR THAT ARE OUTSTANDING AND UNVESTED AT EOY | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | 753,488 | (546,994) | 1,388,365 | 201,719 |
| Non-PEO NEO | PLUS CHANGE IN FAIR VALUE FROM BOY TO VESTING DATE OF AWARDS GRANTED IN ANY PRIOR YEAR THAT VESTED DURING THE YEAR | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | $ 814,038 | (815,908) | $ 459,843 | $ 116,406 |
| Non-PEO NEO | MINUS FAIR VALUE AT BOY OF AWARDS GRANTED IN PRIOR YEAR THAT WERE FORFEITED DURING THE YEAR | | | | |
| Pay vs Performance Disclosure | | | | |
| Adjustment to Compensation, Amount | | $ (1,074,730) | | |
