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Financial Risks - Summary of Information on Three Year Historical Net Income (Loss) and Shareholders' Equity (Detail)
€ in Millions, £ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
GBP (£)
Dec. 31, 2018
EUR (€)
 [1]
Dec. 31, 2018
USD ($)
Dec. 31, 2018
GBP (£)
Dec. 31, 2017
EUR (€)
 [1]
Dec. 31, 2017
USD ($)
Dec. 31, 2017
GBP (£)
Disclosure of historical net income (loss) and shareholders' equity [line items]                  
Net income / (loss) | € € 1,239     € 711     € 2,469    
Americas [member]                  
Disclosure of historical net income (loss) and shareholders' equity [line items]                  
Net income / (loss) | $   $ 1,323     $ 61     $ 1,762  
Equity in functional currency | $   $ 18,117     $ 15,111     $ 17,617  
United Kingdom [member]                  
Disclosure of historical net income (loss) and shareholders' equity [line items]                  
Net income / (loss) | £     £ (29)     £ 35     £ 71
Equity in functional currency | £     £ 1,358     £ 1,671     £ 1,905
[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.