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Pension and Other Employee Benefits - Additional Information (Detail) ₱ / shares in Units, ₱ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 19, 2021 shares | Apr. 07, 2020 shares | Mar. 12, 2020 PHP (₱) shares | Mar. 28, 2019 shares | Apr. 15, 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, 2020 PHP (₱) ₱ / shares shares | Dec. 31, 2019 PHP (₱) ₱ / shares shares | Dec. 31, 2018 PHP (₱) | Mar. 31, 2021 shares | Feb. 28, 2018 PHP (₱) | Oct. 26, 2012 PHP (₱) ₱ / shares
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual net gain (losses) on plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,582 | ₱ 2,855 | ₱ 3,218 |  |  |
Expected contribution in 2021 to the defined benefit plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,880 |  |  |  |  |
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 five years based on the 2021 financial budgets approved by the MediaQuest’s Board of Directors and calculated terminal value. |  |  |  |  |
Carrying value of investments in associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 16,992 | 18,777 |  |  |  |
Direct Subscription In Shares Of Stocks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |
Unpaid Subscription in Unlisted Equity Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32 |  |  |  |  |
Cumulative Change In Fair Market Value Of Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 423 | ₱ 425 |  |  |  |
Debt and fixed income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% | 1.00% |  |  |  |
Net pension benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 270 | ₱ 178 | 314 |  |  |
Accrued expenses and other current liabilities (Notes 24 and 27) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 107,759 | 100,815 |  |  |  |
Cash award paid |  |  | ₱ 654 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash grant covering period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
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 |  | 238,000 | 238,000 | 302,000 | 204,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance Shares [Member] | Major business combination [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares | 238,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plans [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average duration of the defined benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 years |  |  |  |  |
Transformation Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities (Notes 24 and 27) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,134 | 638 | 208 |  |  |
Accrued incentive payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,134 | 795 |  |  |  |
Smart and Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual net gain (losses) on plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 285 | 290 |  |  |  |
Expected contribution in 2021 to the defined benefit plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 299 |  |  |  |  |
Smart and Subsidiaries [Member] | International Equities Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 902 | 1,114 |  |  |  |
Smart and Subsidiaries [Member] | Domestic Fixed Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 832 | 649 |  |  |  |
Smart and Subsidiaries [Member] | PLDT Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 44 | ₱ 13 |  |  |  |
Smart and Subsidiaries [Member] | Philippine Foreign Currency Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest earned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.95% | 10.63% |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 240 | ₱ 516 |  |  |  |
Smart and Subsidiaries [Member] | Domestic Fixed Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74 | 142 |  |  |  |
Government Securities [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 76 | 22 |  |  |  |
Government Securities [member] | Treasury Notes [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.88% |  |  |  |  |
Debt securities [member] | Premyo Bonds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |
Mutual Funds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 21 | 9 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 2,416 | ₱ 1,993 |  |  |  |
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 | ₱ 2,640 |  |  |  |
Dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.50% | 13.50% |  |  |  |
Dividends earned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 49 | ₱ 49 | 49 |  |  |
Corporate Bonds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 255 | 145 |  |  |  |
MediaQuest PDRs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 6,000 |  |  |  |  |  |  |
Percentage of Economic Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |
Deposit for future subscription |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 4,000 |  |  |  |  |  |  |  |
Additional deposit for subscription |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,000 | ₱ 1,000 |  |  |  |  |  |  |  |  |
Additional investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400 | 3,100 | 2,700 |  |  |
Carrying value of investments in associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,914 | 9,747 |  |  |  |
Investment drawn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400 |  |  |  |  |
Loss on changes in fair value of the investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,495 |  |  |  |  |
Satventures Philippine Depositary Receipts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Economic Interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |
Deposit for future subscription |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 3,600 |  |  |  |  |  |  |  |  |  |  |
Additional amount deposited |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,600 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | ₱ 1,950 |  |  |  |  |  |
Additional amount deposited |  |  |  |  |  |  |  |  |  |  |  | ₱ 500 |  | ₱ 1,950 |  |  |  |  |  |  |  |  |  |  |
Total deposit for subscription |  |  |  |  |  |  |  |  |  | ₱ 2,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hasting philippine depository receipts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Economic Interest |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional amount deposited |  |  |  |  |  |  |  | ₱ 3,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional investment |  |  |  |  |  |  |  |  | ₱ 800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  |  |  |  |  |  |  | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance investment amount |  |  |  |  |  |  |  |  | ₱ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of investments in associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,664 |
Tahanan Mutual Building and Loan Association, Inc [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of investments in associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 119 |  |  |  |  |
Deed of pledge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99 |  |  |  |  |
BTF Holdings, Inc. [Member] | Voting Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 150
Subscription price per share | ₱ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1.00
Total Subscription Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 150
Dividend income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 10 | 10 |  |  |
Dividends received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |
Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of stocks sold to third party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 2 | ₱ 2 | ₱ 2 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.60% |  |  |  |  |
Growth rate of cash flows beyond the projection of three years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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] | Corporate Bonds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.70% |  |  |  |  |
Growth rate of cash flows beyond the projection of three years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |
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] | Corporate Bonds [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.94% |  |  |  |  |
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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