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Shareholders' Equity - Summary of Issued Share Capital and Reserves Attributable to Shareholders (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [2]
Dec. 31, 2017
Dec. 31, 2016
Summary of issued share capital and reserves attributable to shareholders [line items]          
Share capital - par value € 323 € 322      
Share premium 7,213 7,487   € 7,731 € 7,873
Total share capital 323 322   322  
Treasury shares (281) (337)   (325)  
Revaluation reserves 5,868 3,436      
Other reserves 456 149   (390) 1,347
Group equity 24,441 22,542 [1] € 24,079 24,079 [2] € 24,341
Shareholders of Aegon NV [member]          
Summary of issued share capital and reserves attributable to shareholders [line items]          
Share capital - par value 323 322   322  
Share premium 7,213 7,487   7,731  
Total share capital 7,536 7,808   8,053  
Retained earnings 10,667 9,995   9,699  
Treasury shares (281) (337)   (325)  
Total retained earnings 10,386 9,657   9,374  
Revaluation reserves 5,868 3,436   4,898  
Remeasurement of defined benefit plans (2,397) (1,850)   (1,669)  
Other reserves 456 149   (390)  
Group equity € 21,850 € 19,200   € 20,266  
[1] See note 2.1.1 for details about the impact of adopting IFRS 16 on Leases and note 2.1.2 for details about the impact of voluntary change in accounting policy on Liability Adequacy Testing
[2] Amounts have been restated to reflect voluntary changes in accounting policies related to liability adequacy testing that was adopted by Aegon effective January 1, 2019. Refer to note 2.1.2 Voluntary changes in accounting policies for details about this change.