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Cover Page
 12 Months Ended
Dec. 31, 2021
shares
Document Information [Line Items]  
Document Type 40-F
Entity Central Index Key 0001086888
Amendment Flag false
Document Period End Date Dec. 31, 2021
Document Fiscal Year Focus 2021
Document Fiscal Period Focus FY
Entity Registrant Name MANULIFE FINANCIAL CORP
Current Fiscal Year End Date --12-31
Entity Current Reporting Status Yes
Entity Emerging Growth Company false
Trading Symbol MFC
Title of 12(b) Security Common Shares
Security Exchange Name NYSE
Entity Address, Country CA
Entity Interactive Data Current Yes
Entity Address, State or Province ON
ICFR Auditor Attestation Flag true
Entity File Number 1-14942
Entity Incorporation, State or Country Code Z4
Entity Address, Address Line One 200 Bloor Street East
Entity Address, City or Town Toronto
Entity Address, Postal Zip Code M4W 1E5
City Area Code 416
Local Phone Number 926-3000
Annual Information Form true
Audited Annual Financial Statements true
Document Annual Report true
Document Registration Statement false
Auditor Name Ernst & Young LLP
Auditor Firm ID 1263
Auditor Location Toronto, Ontario, Canada
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, State or Province MA
Contact Personnel Name James D. Gallagher
Entity Address, Address Line One 200 Berkeley Street
Entity Address, City or Town Boston
Entity Address, Postal Zip Code 02116
City Area Code 617
Local Phone Number 663-3000
Common shares [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 1,942,637,458
Class A Shares Series 2 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 14,000,000
Class A Shares Series 3 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 12,000,000
Class 1 Shares Series 3 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 6,537,903
Class 1 Shares Series 4 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 1,462,097
Class 1 Shares Series 7 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 10,000,000
Class 1 Shares Series 9 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 10,000,000
Class 1 Shares Series 11 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 8,000,000
Class 1 Shares Series 13 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 8,000,000
Class 1 Shares Series 15 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 8,000,000
Class 1 Shares Series 17 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 14,000,000
Class 1 Shares Series 19 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 10,000,000
Class 1 Shares Series 23 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 19,000,000
Class 1 Shares Series 25 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 10,000,000
Class 1 Shares Series 27 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 2,000,000
Class 1 Shares Series 28 [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 1,200,000