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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Pay vs Performance Disclosure [Table] |  |  |
Pay vs Performance [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 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
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 each of the years shown.
(2) | The non-principal executive officer named executive officers were Mr. Morales, Mr. Knavish, Ms. Liebert and Ms. Foulkes for each of the years shown. Mr. Vadlamannati was included as a non-principal executive officer named executive officer for 2022.
(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 [Text Block] |
(1) | The principal executive officer was Mr. McGarry for each of the years shown.
(2) | The non-principal executive officer named executive officers were Mr. Morales, Mr. Knavish, Ms. Liebert and Ms. Foulkes for each of the years shown. Mr. Vadlamannati was included as a non-principal executive officer named executive officer for 2022.
Peer Group Issuers, Footnote [Text Block] |
(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 | $ 8,867,377 | $ 13,199,616 | $ 15,903,993
PEO Actually Paid Compensation Amount | $ 238,659 | 22,568,453 | 16,689,353
Adjustment To PEO Compensation, Footnote [Text Block] | A reconciliation of PEO SCT total compensation to CAP is provided in the following table. PEO SCT Total Compensation to CAP Reconciliation (2020-2022)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 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
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 | $ 2,280,483 | 3,035,088 | 3,607,399
Non-PEO NEO Average Compensation Actually Paid Amount | $ (26,911) | 5,267,224 | 3,526,539
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | 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 (2020-2022)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ |  | ​ | ​ |  | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 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
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 [Text Block] | ​ As shown in the chart below, the PEO’s and the Non-PEO NEOs’ CAP amounts are aligned with the Company’s TSR. This is primarily due 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 [Text Block] | As shown in the chart below, the Company’s CAP is aligned with the Company's net income. The Company does not use net income to determine compensation levels or incentive plan payouts. |  |
Compensation Actually Paid vs. Company Selected Measure [Text Block] | ​ The chart below which compares the PEO’s and the other non-PEO NEOs’ CAP to PPG’s company-selected measure, adjusted earnings per diluted share, indicates that there is a very strong relationship between adjusted earnings per diluted share and CAP. This is primarily due to the Company's use of equity incentives, which are tied directly to stock price and earnings growth in addition to the Company's financial performance. ​ |  |
Total Shareholder Return Vs Peer Group [Text Block] | ​ 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 Text Block] | 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 2022 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 | $ 99 | 133 | 110
Peer Group Total Shareholder Return Amount | 101 | 135 | 112
Net Income (Loss) | $ 1,028,000,000 | $ 1,420,000,000 | $ 1,056,000,000
Company Selected Measure Amount | 6.22 | 6.77 | 6.12
PEO Name | Mr. McGarry |  |
Additional 402(v) Disclosure [Text Block] | ​ Please see “Annual Compensation” and “Long-Term Incentive Compensation” on pages 48 through 56 for a description of how these metrics are used in our executive compensation program. |  |
Measure [Axis]: 1 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Adjusted earnings per diluted share |  |
Measure [Axis]: 2 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Cash flow return on capital |  |
Measure [Axis]: 3 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Total shareholder return |  |
PEO [Member] | MINUS SCT CHANGE IN PENSION VALUE |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ 4,368,862 | $ 218,598 | $ (4,289,632)
PEO [Member] | PLUS PENSION VALUE SERVICE COST |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount |  |  | 180,279
PEO [Member] | MINUS SCT EQUITY |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (10,000,026) | (9,400,002) | (8,249,709)
PEO [Member] | PLUS EOY FAIR VALUE OF EQUITY AWARDS GRANTED DURING YEAR THAT ARE OUTSTANDING AND UNVESTED AT EOY |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 7,834,096 | 10,917,328 | 11,073,569
PEO [Member] | 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 [Table] |  |  |
Adjustment to Compensation Amount | (4,197,554) | 4,275,913 | 1,559,781
PEO [Member] | 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 [Table] |  |  |
Adjustment to Compensation Amount | (6,634,096) | 3,357,000 | 511,072
Non-PEO NEO [Member] | MINUS SCT CHANGE IN PENSION VALUE |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 846,793 | 105,473 | (995,665)
Non-PEO NEO [Member] | PLUS PENSION VALUE SERVICE COST |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount |  |  | 117,478
Non-PEO NEO [Member] | MINUS SCT EQUITY |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (1,970,003) | (1,724,948) | (1,399,950)
Non-PEO NEO [Member] | PLUS EOY FAIR VALUE OF EQUITY AWARDS GRANTED DURING YEAR THAT ARE OUTSTANDING AND UNVESTED AT EOY |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 1,253,448 | 2,003,403 | 1,879,152
Non-PEO NEO [Member] | 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 [Table] |  |  |
Adjustment to Compensation Amount | (546,994) | 1,388,365 | 201,719
Non-PEO NEO [Member] | 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 [Table] |  |  |
Adjustment to Compensation Amount | (815,908) | $ 459,843 | $ 116,406
Non-PEO NEO [Member] | MINUS FAIR VALUE AT BOY OF AWARDS GRANTED IN PRIOR YEAR THAT WERE FORFEITED DURING THE YEAR |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ (1,074,730) |  |

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