v3.26.1
Group Companies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2025
Asset Management [member] | Aegon Industrial Fund Management Co Ltd [member]  
Disclosure of subsidiaries [Line Items]  
Name of joint venture Aegon Industrial Fund Management Co
Country of incorporation of joint venture China
Proportion of ownership interest in joint venture 49.00%
Aegon Asset Management Holding B.V. [member] | Asset Management [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Aegon Asset Management Holding B.V
Country of incorporation or residence of subsidiary The Netherlands
Aegon USA Investment Management, LLC [member] | Asset Management [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Aegon USA Investment Management
Country of incorporation or residence of subsidiary United States
Aegon USA Realty Advisors, LLC [member] | Asset Management [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Aegon USA Realty Advisors, LLC
Country of incorporation or residence of subsidiary United States
Aegon Investment Management B. V [member] | Asset Management [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Aegon Investment Management B.V
Country of incorporation or residence of subsidiary The Netherlands
Aegon Asset Management UK plc [member] | Asset Management [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Aegon Asset Management UK plc
Country of incorporation or residence of subsidiary United Kingdom
Americas [member] | Transamerica Casualty Insurance Company [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Transamerica Casualty Insurance Company
Country of incorporation or residence of subsidiary United States
Americas [member] | Transamerica Corporation [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Transamerica Corporation
Country of incorporation or residence of subsidiary United States
Americas [member] | Transamerica Financial Life Insurance Company [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Transamerica Financial Life Insurance Company
Country of incorporation or residence of subsidiary United States
Americas [member] | Transamerica Life Insurance Company [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Transamerica Life Insurance Company, Cedar Rapids
Country of incorporation or residence of subsidiary United States
Americas [member] | World Financial Group Holding Company of Canada Inc [Member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary World Financial Group Holding Company of Canada Inc
Country of incorporation or residence of subsidiary Canada
Americas [member] | World Financial Group Insurance Agency, LLC [Member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary World Financial Group Insurance Agency, LLC, Cedar Rapids
Country of incorporation or residence of subsidiary United States
United Kingdom [member] | Aegon Investment Solutions Ltd. [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Aegon Investment Solutions Ltd
Country of incorporation or residence of subsidiary United Kingdom
United Kingdom [member] | Aegon Investments Ltd. [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Aegon Investments Ltd
Country of incorporation or residence of subsidiary United Kingdom
United Kingdom [member] | Scottish Equitable plc [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Scottish Equitable plc
Country of incorporation or residence of subsidiary United Kingdom
United Kingdom [member] | Cofunds Limited [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Cofunds Limited
Country of incorporation or residence of subsidiary United Kingdom
United Kingdom [member] | Origen Financial Services Limited [Member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Origen Financial Services Limited
Country of incorporation or residence of subsidiary United Kingdom
International [member] | Aegon Espana S.A.U [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Aegon España S.A.U. de Seguros y Reaseguros
Country of incorporation or residence of subsidiary Spain
International [member] | Transamerica Life (Bermuda) Ltd [member]  
Disclosure of subsidiaries [Line Items]  
Name of subsidiary Transamerica Life (Bermuda) Ltd
Country of incorporation or residence of subsidiary Bermuda
International [member] | Aegon Santander Generales Seguros y Reaseguros, S.A. [member]  
Disclosure of subsidiaries [Line Items]  
Name of joint venture Santander Generales Seguros y Reaseguros, S.A
Country of incorporation of joint venture Spain
Proportion of ownership interest in joint venture 51.00%
International [member] | Santander Vida Segurosy Reaseguros S. A. [member]  
Disclosure of subsidiaries [Line Items]  
Name of joint venture Santander Vida Seguros y Reaseguros, S.A
Country of incorporation of joint venture Spain
Proportion of ownership interest in joint venture 51.00%
International [member] | Aegon Santander Portugal Nao Vida Companhiade Seguros S. A. [member]  
Disclosure of subsidiaries [Line Items]  
Name of joint venture Aegon Santander Portugal Não Vida – Companhia de Seguros S.A.
Country of incorporation of joint venture Portugal
Proportion of ownership interest in joint venture 51.00%
International [member] | Aegon Santander Portugal Vida Companhia de Seguros de Vida SA Lisbon [member]  
Disclosure of subsidiaries [Line Items]  
Name of joint venture Aegon Santander Portugal Vida – Companhia de Seguros de Vida S.A
Country of incorporation of joint venture Portugal
Proportion of ownership interest in joint venture 51.00%
International [member] | Aegon THTF Life Insurance Company Ltd [member]  
Disclosure of subsidiaries [Line Items]  
Name of joint venture Aegon THTF Life Insurance Co., Ltd
Country of incorporation of joint venture China
Proportion of ownership interest in joint venture 50.00%
International [member] | Mongeral Aegon, Seguros e Previdencia S.A. [member]  
Disclosure of subsidiaries [Line Items]  
Proportion of voting power held in joint venture 50.00%
Name of joint venture Mongeral Aegon, Seguros e Previdencia S.A.
Country of incorporation of joint venture Brazil
Proportion of ownership interest in joint venture 59.20%
International [member] | Sicoob Seguradode De Vidae Previdencia SA [Member]  
Disclosure of subsidiaries [Line Items]  
Name of joint venture Sicoob Seguradora de Vida e Previdência S.A
Country of incorporation of joint venture Brazil
Proportion of ownership interest in joint venture 29.60%