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Capital Instruments - Schedule of Carrying Value of Capital Instruments (Parenthetical) (Detail) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Nov. 22, 2022
Carrying value of capital instruments [line items] |  |  |
Debt securities | $ 6,122 | $ 6,980 |
on November 22, 2022 |  |  |
Carrying value of capital instruments [line items] |  |  |
Bond redemption variable interest rate |  |  | 3.181%
JHFC subordinated notes [member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Interest rate, basis | 90-day Bankers’ Acceptance rate plus 0.72% |  |
Floating interest rate, adjustment to basis | 0.72% |  |
Debt securities | $ 647 | 647 |
JHFC subordinated notes [member] | Canadian Dollar Offered Rate [Member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Debt securities | 647 | 647 |
JHFC subordinated notes [member] | Future Referencing Canadian Dollar Offered Rate [Member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Debt securities |  | 4,338 |
JHFC subordinated notes [member] | US Dollar Mid Swaprate [Member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Debt securities | 3,343 | 947 |
JHFC subordinated notes [member] | Singapore Swap Rate [Member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Debt securities | 1,013 | 469 |
JHFC subordinated notes [member] | Singapore Swap Rate 1 [Member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Debt securities | $ 504 |  |
2.818% MFC Subordinated debentures [member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Floating interest rate, adjustment to basis | 1.82% |  |
Debt securities | $ 996 | 995 |
Earliest par redemption date | May 13, 2030 |  |
4.061% MFC subordinated notes [member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Interest rate, basis | 5-Year US Dollar Mid-Swap Rate plus 1.647% |  |
Floating interest rate, adjustment to basis | 1.647% |  |
Interest rate reset period | 5 years |  |
Debt securities | $ 1,013 | 947 |
Earliest par redemption date | Feb. 24, 2027 |  |
7.375% JHUSA Surplus notes [Member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Debt securities | $ 615 | 579 |
3.00% MFC subordinated notes [member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Interest rate, basis | 5-Year Singapore Dollar Swap Rate plus 0.832% |  |
Floating interest rate, adjustment to basis | 0.832% |  |
Interest rate reset period | 5 years |  |
Debt securities | $ 504 | 469 |
Earliest par redemption date | Nov. 21, 2024 |  |
3.049% MFC Subordinated debentures [member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Floating interest rate, adjustment to basis | 105.00% |  |
Debt securities | $ 749 | 748 |
Earliest par redemption date | Aug. 20, 2024 |  |
3.317% MFC Subordinated debentures [member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Interest rate, basis | 3-month CDOR plus a specified number of basis points. |  |
Floating interest rate, adjustment to basis | 78.00% |  |
Debt securities | $ 600 | 599 |
Earliest par redemption date | May 09, 2023 |  |
3.85% MFC Subordinated notes [Member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Earliest par redemption date | Nov. 22, 2022 |  |
2.237% MFC Subordinated debentures [member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Floating interest rate, adjustment to basis | 1.49% |  |
Debt securities | $ 998 | 997 |
Earliest par redemption date | May 12, 2025 |  |
John Hancock Financial Corporation [Member] | 7.375% JHUSA Surplus notes [Member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Unamortized fair value increment | $ 5 | $ 9 |
Manufacturers life insurance company [Member] |  |  |
Carrying value of capital instruments [line items] |  |  |
Interest rate, basis | 3-month CDOR plus a specified number of basis points. |  |

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