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Pension and Other Employee Benefits - Additional Information (Detail) ₱ / shares in Units, ₱ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 Months Ended | 12 Months Ended |  |  |
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Mar. 12, 2020 PHP (₱) shares | Mar. 28, 2019 shares | May 25, 2018 PHP (₱) | Apr. 05, 2018 shares | Mar. 07, 2018 shares | Sep. 26, 2017 shares | May 30, 2015 PHP (₱) | May 21, 2015 PHP (₱) | Dec. 31, 2014 PHP (₱) | Mar. 11, 2014 PHP (₱) | Feb. 19, 2014 PHP (₱) | Sep. 27, 2013 | Jan. 25, 2013 PHP (₱) | Aug. 09, 2012 PHP (₱) | Jul. 06, 2012 PHP (₱) | Jun. 30, 2012 PHP (₱) | May 08, 2012 PHP (₱) | Oct. 31, 2013 PHP (₱) | Dec. 31, 2019 PHP (₱) ₱ / shares shares | Dec. 31, 2018 PHP (₱) ₱ / shares shares | Dec. 31, 2017 PHP (₱) | Dec. 31, 2016 PHP (₱) | Mar. 31, 2020 shares | Feb. 28, 2018 PHP (₱) | Oct. 26, 2012 PHP (₱) ₱ / shares
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual net gain (losses) on plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 2,855,000 | ₱ 3,218,000 | ₱ 1,825,000 |  |  |  |
Expected contribution in 2020 to the defined benefit plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,589,000 |  |  |  |  |  |
Description of retirement benefit plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Benefits are payable in the event of termination of employment due to: (i) compulsory, optional, or deferred retirement; (ii) death while in active service; (iii) physical disability; (iv) voluntary resignation; or (v) involuntary separation from service. For a plan member with less than 15 years of credited services, retirement benefit is equal to 100% of final compensation for every year of service. For those with at least 15 years of service, retirement benefit is equal to 125% of final compensation for every year of service, with such percentage to be increased by an additional 5% for each completed year of service in excess of 15 years, but not to exceed a maximum of 200%. In case of voluntary resignation after attainment of age 40 and completion of at least 15 years of credited service, benefit is equal to a percentage of his vested retirement benefit, in accordance with percentages prescribed in the retirement plan. |  |  |  |  |  |
VIU calculations derived from cash flow projections |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The VIU calculations were derived from cash flow projections over a period of three to five years based on the 2019 financial budgets approved by the MediaQuest’s Board of Directors and calculated terminal value. |  |  |  |  |  |
Carrying value of investments in associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 18,777,000 | 20,498,000 |  |  |  |  |
Direct Subscription In Shares Of Stocks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 112,000 |  |  |  |  |  |
Unpaid Subscription in Unlisted Equity Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,000 |  |  |  |  |  |
Cumulative Change In Fair Market Value Of Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 464,000 | ₱ 394,000 |  |  |  |  |
Debt and fixed income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 1.00% |  |  |  |  |
Net pension benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 178,000 | ₱ 314,000 | 251,000 |  |  |  |
Accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,815,000 | 95,724,000 |  |  |  |  |
Major business combination [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash award paid | ₱ 654,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major business combination [member] | Trustee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Shares of Common Stock | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 757,000 |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares | 236,000 | 302,000 |  | 204,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transformation Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 638,000 | 208,000 | 827,000 |  |  |  |
Accrued incentive payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 795,000 |  |  |  |  |  |
Smart and Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual net gain (losses) on plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 290,000 |  | 205,000 |  |  |  |
Expected contribution in 2020 to the defined benefit plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 337,000 |  |  |  |  |  |
Net pension benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,084,000 | 3,159,000 |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,448,000 | 3,794,000 |  |  |  |  |
Smart and Subsidiaries [Member] | International Equities Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,114,000 | 550,000 |  |  |  |  |
Smart and Subsidiaries [Member] | Domestic Fixed Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 649,000 | 333,000 |  |  |  |  |
Smart and Subsidiaries [Member] | PLDT Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 13,000 | ₱ 15,000 |  |  |  |  |
Smart and Subsidiaries [Member] | Philippine Foreign Currency Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest earned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.70% | 10.63% |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 516,000 | ₱ 165,000 |  |  |  |  |
Smart and Subsidiaries [Member] | Domestic Fixed Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 142,000 |  |  |  |  |  |
Government Securities [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.88% |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 22,000 | 31,000 |  |  |  |  |
Mutual Funds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 9,000 | 4,000 |  |  |  |  |
Fixed Income Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of portfolio percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Temporary Placements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of portfolio percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |
Equity Securities 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of portfolio percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |
Equity Securities 1 [Member] | Smart and Subsidiaries [Member] | Domestic Fixed Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,993,000 | ₱ 1,854,000 |  |  |  |  |
Debt and Fixed Income Securities [Member] | Smart and Subsidiaries [Member] | Domestic Fixed Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest earned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.80% | 12.00% |  |  |  |  |
Unlisted Preferred Shares [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subscription price per share | ₱ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 10 | ₱ 10 |  |  |  |  |
Unlisted preferred shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 | 300,000,000 |  |  |  |  |
Subscription payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 2,640,000 | ₱ 2,640,000 |  |  |  |  |
Dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.50% | 13.50% |  |  |  |  |
Dividends earned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 49,000 | ₱ 49,000 | 49,000 |  |  |  |
Corporate Bonds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145,000 | 133,000 |  |  |  |  |
MediaQuest PDRs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 6,000,000 |  |  |  |  |  |  |  |
Percentage of Economic Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |
Deposit for future subscription |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 4,000,000 |  |  |  |  |  |  |  |  |
Additional deposit for subscription |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,000,000 | ₱ 1,000,000 |  |  |  |  |  |  |  |  |  |
Additional investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,100,000 | 2,700,000 | 2,500,000 | ₱ 5,500,000 |  |  |
Carrying value of investments in associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,747,000 | 9,262,000 |  |  |  |  |
Investment drawn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,100,000 | 2,700,000 |  |  |  |  |
Loss on changes in fair value of the investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,072,000 | 3,038,000 |  |  |  |  |
Satventures Philippine Depositary Receipts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Economic Interest |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |
Deposit for future subscription |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Additional amount deposited |  |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Cignal TV Philippine Depositary Receipts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Economic Interest |  |  |  |  |  |  |  |  |  |  |  | 64.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Hastings Philippine Depositary Receipts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit for future subscription |  |  |  |  |  |  |  |  |  | ₱ 300,000 |  |  |  |  |  |  |  | ₱ 1,950 |  |  |  |  |  |  |
Additional amount deposited |  |  |  |  |  |  |  |  |  |  | ₱ 500,000 |  | ₱ 1,950 |  |  |  |  |  |  |  |  |  |  |  |
Total deposit for subscription |  |  |  |  |  |  |  |  | ₱ 2,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hasting philippine depository receipts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Economic Interest |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional amount deposited |  |  |  |  |  |  | ₱ 3,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional investment |  |  |  |  |  |  |  | ₱ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance investment amount |  |  |  |  |  |  |  | ₱ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of investments in associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,664,000 |
BTF Holdings, Inc. [Member] | Voting Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 150,000
Subscription price per share | ₱ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1.00
Total Subscription Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 150,000
Dividend income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 | 10,000 | 10,000 |  |  |  |
Dividends received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 | 2,000 |  |  |  |  |
SMPHI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of stocks sold to third party |  |  | ₱ 142,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bancholders Inc [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Change In Fair Market Value Of Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93,000 |  |  |  |
Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of stocks sold to third party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 2,000 | ₱ 2,000 | ₱ 2,000 |  |  |  |
Plan Member with Less Than 15 Years of Credited Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credited services period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Percentage of retirement benefit equal to compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Plan Member with At Least 15 Years of Credited Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credited services period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Percentage of retirement benefit equal to compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |  |  |
Plan Member with At Least 15 Years of Credited Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credited services period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Additional retirement benefit percentage for each completed year in excess of 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Bottom of Range [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average duration of the defined benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years |  |  |  |  |  |
Pre-tax discount rates applied to cash flow projections |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.30% |  |  |  |  |  |
Growth rate of cash flows beyond the projection period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |
Percentage of contribution to plan by employer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Debt and fixed income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |
Bottom of Range [Member] | Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance share awards performance period |  |  |  |  |  | Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bottom of Range [Member] | Defined Contribution Plans [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average duration of the defined benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 years |  |  |  |  |  |
Bottom of Range [Member] | Corporate Bonds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.95% |  |  |  |  |  |
Top of Range [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average duration of the defined benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 years |  |  |  |  |  |
Pre-tax discount rates applied to cash flow projections |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.90% |  |  |  |  |  |
Growth rate of cash flows beyond the projection period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.10% |  |  |  |  |  |
Percentage of contribution to plan by employer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |
Percentage of contribution to plan by employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |
Debt and fixed income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Top of Range [Member] | Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance share awards performance period |  |  |  |  |  | Jan. 01, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  | 914,000 | 860,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for acquisition of additional performance shares | shares |  |  |  |  | 54,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Top of Range [Member] | Defined Contribution Plans [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average duration of the defined benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |
Top of Range [Member] | Corporate Bonds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.06% |  |  |  |  |  |
Top of Range [Member] | Plan Member with At Least 15 Years of Credited Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of retirement benefit equal to compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  |  |  |

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