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Significant accounting policies - Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Consolidated Balance Sheet (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
 [1]
Dec. 31, 2017
Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Consolidated Balance Sheet [Line Items]        
Shareholders' Equity € 21,850 € 19,200 [1] € 20,266  
Insurance contracts 123,454 115,328 [1] 110,848  
Deferred tax liability € 1,227 529 [1] € 1,021  
Previously stated [member]        
Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Consolidated Balance Sheet [Line Items]        
Shareholders' Equity   19,225   € 20,288
Insurance contracts   115,294   110,818
Deferred tax liability   538   1,029
Changes in accounting policy due to liability adequacy testing        
Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Consolidated Balance Sheet [Line Items]        
Shareholders' Equity   (26)   (23)
Insurance contracts   34   30
Deferred tax liability   (9)   (8)
As Restated [Member]        
Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Consolidated Balance Sheet [Line Items]        
Shareholders' Equity   19,200   20,266
Insurance contracts   115,328   110,848
Deferred tax liability   € 529   € 1,021
[1] 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.