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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.

X

- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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