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Employee Benefits - Additional Information (Detail) ₱ / shares in Units, ₱ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 Months Ended | 6 Months Ended | 12 Months Ended |  |
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May 25, 2018 PHP (₱) | Apr. 05, 2018 shares | Mar. 07, 2018 shares | Sep. 26, 2017 shares | Jun. 01, 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 (₱) | Aug. 31, 2013 PHP (₱) | Dec. 31, 2018 PHP (₱) m² Year ₱ / shares shares | Dec. 12, 2018 PHP (₱) | Dec. 31, 2017 PHP (₱) ₱ / shares shares | Dec. 31, 2016 PHP (₱) | Mar. 21, 2019 shares | Oct. 26, 2012 PHP (₱) ₱ / shares
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual net gain (losses) on plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 3,218 |  | ₱ 1,825 | ₱ 4,946 |  |
Expected contribution in 2019 to the defined benefit plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,217 |  |  |  |  |
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. |  |  |  |  |
Direct subscription in shares of stocks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 112 |  |  |  |  |
Unpaid subscription in unlisted equity investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32 |  |  |  |  |
Cumulative change in fair market value of investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 394 |  | 355 |  |  |
Fixed interest rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.88% |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 31 |  | 22 |  |  |
Investment properties (Notes 6 and 13) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 777 |  | ₱ 1,635 | 1,890 |  |
Debt and fixed income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  | 1.00% |  |  |
Net pension benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 314 |  | ₱ 251 | 238 |  |
Accrued expenses and other current liabilities (Notes 23 and 26) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95,724 |  | 90,740 |  |  |
Transformation Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities (Notes 23 and 26) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 208 |  | 827 |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  | 204,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for acquisition of additional performance shares | shares |  |  | 54,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Smart and Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual net gain (losses) on plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 205 | 51 |  |
Expected contribution in 2019 to the defined benefit plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 260 |  |  |  |  |
Net pension benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,159 |  | 2,862 |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,794 |  | 3,728 |  |  |
Smart and Subsidiaries [Member] | International Equities Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 550 |  | 557 |  |  |
Smart and Subsidiaries [Member] | Domestic Fixed Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 333 |  | 555 |  |  |
Smart and Subsidiaries [Member] | PLDT Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 15 |  | ₱ 24 |  |  |
Smart and Subsidiaries [Member] | Philippine Foreign Currency Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest earned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.25% |  | 7.38% |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 165 |  | ₱ 373 |  |  |
Smart and Subsidiaries [Member] | Domestic Fixed Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets of Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 361 |  |  |
Corporate Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 133 |  | 111 |  |  |
Mutual Funds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 4 |  | 30 |  |  |
Investment property [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of condominium unit of investment property | m² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58 |  |  |  |  |
Investment properties (Notes 6 and 13) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,854 |  | ₱ 1,721 |  |  |
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% |  | 10.13% |  |  |
Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends earned on common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 2 |  | ₱ 2 | 3 |  |
Trustee [Member] | Major business combination [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Shares of Common Stock | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 757,000 |
SMPHI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of stocks sold to third party | ₱ 142 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700 |  | 2,500 | ₱ 5,500 |  |
Amunt drawn for investment requirements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700 |  |  |  |  |
Loss on changes in fair value of the investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,038 |  | 2,071 |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Economic Interest |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit for future subscription |  |  |  |  |  |  |  | ₱ 300 |  |  |  |  |  |  |  | ₱ 1,950 |  |  |  |  |  |  |
Additional amount deposited |  |  |  |  | ₱ 3,250 |  |  |  | ₱ 500 |  | ₱ 1,950 |  |  |  |  |  |  |  |  |  |  |  |
Total deposit for subscription |  |  |  |  |  |  | ₱ 2,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional investment |  |  |  |  |  | ₱ 800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  |  |  |  | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance investment amount |  |  |  |  |  | ₱ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
Dividends received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 2 |  | 2 |  |  |
Bancholders Inc [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative change in fair market value of investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 93 |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax discount rates applied to cash flow projections |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.23% |  |  |  |  |
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] | Corporate Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.13% |  |  |  |  |
Bottom Of Range [Member] | Equity Securities 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of portfolio percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Bottom Of Range [Member] | Debt and Fixed Income Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of portfolio percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average duration of the defined benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  |  |
Pre-tax discount rates applied to cash flow projections |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.10% |  |  |  |  |
Growth rate of cash flows beyond the projection period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.80% |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Top of range [member] | Corporate Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.06% |  |  |  |  |
Top of range [member] | Equity Securities 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of portfolio percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |
Top of range [member] | Debt and Fixed Income Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Defined Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of portfolio percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |
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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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard -URIDate 2018-03-16 + Details
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