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Capital Instruments - Schedule of Carrying Value of Capital Instruments (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 SGD ($) | Dec. 31, 2019 CAD ($)
Carrying value of capital instruments [line items] |  |  |  |
Total | $ 7,829,000,000 |  |  | $ 7,120,000,000
JHFC subordinated notes [member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Issuance date | Dec. 14, 2006 |  |  |
Maturity date | Dec. 15, 2036 |  |  |
Par value | $ 650 |  |  |
Total | $ 647,000,000 |  |  | 647,000,000
2.818% MFC Subordinated debentures [member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Capital instruments interest rate | 2.818% | 2.818% | 2.818% |
Issuance date | May 12, 2020 |  |  |
Earliest par redemption date | May 13, 2030 |  |  |
Maturity date | May 13, 2035 |  |  |
Par value | $ 1,000 |  |  |
Total | $ 995,000,000 |  |  |
4.061% MFC subordinated notes [member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Capital instruments interest rate | 4.061% | 4.061% | 4.061% |
Issuance date | Feb. 24, 2017 |  |  |
Earliest par redemption date | Feb. 24, 2027 |  |  |
Maturity date | Feb. 24, 2032 |  |  |
Par value |  | $ 750 |  |
Total | $ 951,000,000 |  |  | 969,000,000
2.237% MFC Subordinated debentures [member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Capital instruments interest rate | 2.237% | 2.237% | 2.237% |
Issuance date | May 12, 2020 |  |  |
Earliest par redemption date | May 12, 2025 |  |  |
Maturity date | May 12, 2030 |  |  |
Par value | $ 1,000 |  |  |
Total | $ 996,000,000 |  |  |
7.375% JHUSA Surplus notes [Member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Capital instruments interest rate | 7.375% | 7.375% | 7.375% |
Issuance date | Feb. 25, 1994 |  |  |
Maturity date | Feb. 15, 2024 |  |  |
Par value |  | $ 450 |  |
Total | $ 584,000,000 |  |  | 598,000,000
3.00% MFC subordinated notes [member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Capital instruments interest rate | 3.00% | 3.00% | 3.00% |
Issuance date | Nov. 21, 2017 |  |  |
Earliest par redemption date | Nov. 21, 2024 |  |  |
Maturity date | Nov. 21, 2029 |  |  |
Par value |  |  | $ 500 |
Total | $ 480,000,000 |  |  | 481,000,000
3.049% MFC Subordinated debentures [member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Capital instruments interest rate | 3.049% | 3.049% | 3.049% |
Issuance date | Aug. 18, 2017 |  |  |
Earliest par redemption date | Aug. 20, 2024 |  |  |
Maturity date | Aug. 20, 2029 |  |  |
Par value | $ 750 |  |  |
Total | $ 748,000,000 |  |  | 747,000,000
3.317% MFC Subordinated debentures [member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Capital instruments interest rate | 3.317% | 3.317% | 3.317% |
Issuance date | May 09, 2018 |  |  |
Earliest par redemption date | May 09, 2023 |  |  |
Maturity date | May 09, 2028 |  |  |
Par value | $ 600 |  |  |
Total | $ 598,000,000 |  |  | 598,000,000
3.181% MLI Subordinated debentures [Member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Capital instruments interest rate | 3.181% | 3.181% | 3.181% |
Issuance date | Nov. 20, 2015 |  |  |
Earliest par redemption date | Nov. 22, 2022 |  |  |
Maturity date | Nov. 22, 2027 |  |  |
Par value | $ 1,000 |  |  |
Total | $ 999,000,000 |  |  | 998,000,000
3.85% MFC Subordinated notes [Member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Capital instruments interest rate | 3.85% | 3.85% | 3.85% |
Issuance date | May 25, 2016 |  |  |
Earliest par redemption date | May 25, 2021 |  |  |
Maturity date | May 25, 2026 |  |  |
Par value |  |  | $ 500 |
Total | $ 481,000,000 |  |  | 482,000,000
2.389% MLI Subordinated debentures [Member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Capital instruments interest rate | 2.389% | 2.389% | 2.389% |
Issuance date | Jun. 01, 2015 |  |  |
Earliest par redemption date | Jan. 05, 2021 |  |  |
Maturity date | Jan. 05, 2026 |  |  |
Par value | $ 350 |  |  |
Total | $ 350,000,000 |  |  | 350,000,000
2.10% MLI Subordinated debentures [Member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Capital instruments interest rate | 2.10% | 2.10% | 2.10% |
Issuance date | Mar. 10, 2015 |  |  |
Earliest par redemption date | Jun. 01, 2020 |  |  |
Maturity date | Jun. 01, 2025 |  |  |
Par value | $ 750 |  |  |
Total |  |  |  | 750,000,000
2.64% MLI Subordinated debentures [Member] |  |  |  |
Carrying value of capital instruments [line items] |  |  |  |
Capital instruments interest rate | 2.64% | 2.64% | 2.64% |
Issuance date | Dec. 01, 2014 |  |  |
Earliest par redemption date | Jan. 15, 2020 |  |  |
Maturity date | Jan. 15, 2025 |  |  |
Par value | $ 500 |  |  |
Total |  |  |  | $ 500,000,000

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