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Shareholders' Equity - Summary of Shareholders' Equity (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of shareholders equity [line items]      
Beginning balance € 22,542 [1] € 24,079 [2] € 24,341
Owners of Aegon N.V. 1,239 710 2,469
Changes in revaluation reserve real estate held for own use (4) (32) [2] 8 [2]
Total other comprehensive income / (loss) 2,232 (1,107) [2] (1,968) [2]
Shares issued 1   3
Issuance and purchase of treasury shares (825) 14 (105)
Issuance and redemption of other equity instruments   (468)  
Dividend withholding tax reduction   1 2
Coupons on perpetual securities (88) (102) (103)
Incentive plans (3) (2) (1)
Ending balance 24,441 22,542 [1] 24,079 [2]
Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 22,498   24,249 [2]
Ending balance   22,498  
Share capital [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 7,808 [1] 8,053 [2] 8,193
Shares issued 1   3
Ending balance 7,536 7,808 [1] 8,053 [2]
Share capital [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 7,808   8,193 [2]
Ending balance   7,808  
Revaluation account [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 3,436 [1] 4,898 [2] 5,381
Changes in revaluation reserve real estate held for own use (36) (32) 8
Total other comprehensive income / (loss) 2,433 (1,462) (391)
Ending balance 5,868 3,436 [1] 4,898 [2]
Revaluation account [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 3,436   5,289 [2]
Ending balance   3,436  
Retained earnings [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 9,657 [1] 9,374 [2] 7,419
Changes in revaluation reserve real estate held for own use 32    
Total other comprehensive income / (loss) 40 (3) 13
Issuance and purchase of treasury shares (81) 14 (105)
Issuance and redemption of other equity instruments   2  
Dividend withholding tax reduction   1 2
Coupons on perpetual securities (88) (102) (103)
Incentive plans 2   4
Ending balance 10,386 9,657 [1] 9,374 [2]
Retained earnings [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 9,613   7,419 [2]
Ending balance   9,613  
Remeasurement of defined benefit Plans of group companies [member]      
Disclosure of shareholders equity [line items]      
Beginning balance (1,850) [1] (1,669) [2] (1,820)
Total other comprehensive income / (loss) (547) (182) 151
Ending balance (2,397) (1,850) [1] (1,669) [2]
Remeasurement of defined benefit Plans of group companies [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance (1,850)   (1,820) [2]
Ending balance   (1,850)  
Aegon N.V [member]      
Disclosure of shareholders equity [line items]      
Beginning balance [3] 19,200    
Owners of Aegon N.V. 1,239 710 2,469
Ending balance 21,850 19,200 [3]  
Aegon N.V [member] | Common Share B [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 19,200 20,287  
Mandatory change in accounting policy (44)    
Changes in accounting policies related to liability adequancy testing   (22)  
Net income 1,239 710  
Owners of Aegon N.V. 1,239 710  
Foreign currency translation differences and movement in foreign investment hedging reserves 271 499  
Changes in revaluation subsidiaries 2,460 (1,462)  
Changes in revaluation reserve real estate held for own use (3)    
Remeasurement of defined benefit plans of group companies (522) (150)  
Changes and transfer to legal reserve 11 9  
Other 15 (3)  
Total other comprehensive income / (loss) 2,234 (1,108)  
Shares issued 1    
Dividends paid on common shares (583) (573)  
Issuance and purchase of treasury shares (30)    
Issuance and redemption of other equity instruments (81)    
Dividend withholding tax reduction   1  
Treasury shares   (14)  
Coupons on perpetual securities (88)    
Incentive plans 2    
Coupons and premium on convertible core capital securities and coupon on perpetual securities, net of tax   (113)  
Ending balance 21,850 19,200 20,287
Aegon N.V [member] | Common Share B [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 19,156 20,265  
Ending balance   19,156 20,265
Aegon N.V [member] | Share capital [member] | Common Share B [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 322 322  
Shares issued 1    
Ending balance 323 322 322
Aegon N.V [member] | Share capital [member] | Common Share B [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 322 322  
Ending balance   322 322
Aegon N.V [member] | Paid-in surplus [member] | Common Share B [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 7,486 7,731  
Dividends paid on common shares (273) (244)  
Ending balance 7,213 7,486 7,731
Aegon N.V [member] | Paid-in surplus [member] | Common Share B [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 7,486 7,731  
Ending balance   7,486 7,731
Aegon N.V [member] | Revaluation account [member]      
Disclosure of shareholders equity [line items]      
Changes and transfer to legal reserve 143    
Aegon N.V [member] | Revaluation account [member] | Common Share B [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 3,540 5,017  
Changes in accounting policies related to liability adequancy testing   (22)  
Changes in revaluation subsidiaries 2,460 (1,462)  
Changes in revaluation reserve real estate held for own use (28)    
Changes and transfer to legal reserve   7  
Total other comprehensive income / (loss) 2,576 (1,455)  
Ending balance 6,116 3,540 5,017
Aegon N.V [member] | Revaluation account [member] | Common Share B [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 3,540 4,995  
Ending balance   3,540 4,995
Aegon N.V [member] | Legal reserve FCTR [member] | Common Share B [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 130 (401)  
Foreign currency translation differences and movement in foreign investment hedging reserves 296 531  
Total other comprehensive income / (loss) 296 531  
Ending balance 426 130 (401)
Aegon N.V [member] | Legal reserve FCTR [member] | Common Share B [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 130 (401)  
Ending balance   130 (401)
Aegon N.V [member] | Legal reserve group companies [member] | Common Share B [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 1,326 1,122  
Changes and transfer to legal reserve 377 204  
Total other comprehensive income / (loss) 377 204  
Ending balance 1,703 1,326 1,122
Aegon N.V [member] | Legal reserve group companies [member] | Common Share B [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 1,326 1,122  
Ending balance   1,326 1,122
Aegon N.V [member] | Retained earnings [member]      
Disclosure of shareholders equity [line items]      
Changes and transfer to legal reserve 509    
Aegon N.V [member] | Retained earnings [member] | Common Share B [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 7,872 6,022  
Mandatory change in accounting policy (44)    
Net income 2017 retained   2,469  
Net income 2018 retained 710    
Owners of Aegon N.V. 710 2,469  
Changes in revaluation reserve real estate held for own use 25    
Changes and transfer to legal reserve   (202)  
Other 15 (3)  
Total other comprehensive income / (loss) (469) (205)  
Dividends paid on common shares (309) (329)  
Issuance and purchase of treasury shares (86)    
Issuance and redemption of other equity instruments (81)    
Dividend withholding tax reduction   1  
Treasury shares   26  
Coupons on perpetual securities (88)    
Incentive plans 2    
Coupons and premium on convertible core capital securities and coupon on perpetual securities, net of tax   (113)  
Ending balance 7,508 7,872 6,022
Aegon N.V [member] | Retained earnings [member] | Common Share B [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 7,828 6,022  
Ending balance   7,828 6,022
Aegon N.V [member] | Remeasurement of defined benefit Plans of group companies [member] | Common Share B [member]      
Disclosure of shareholders equity [line items]      
Beginning balance (1,850) (1,669)  
Foreign currency translation differences and movement in foreign investment hedging reserves (25) (32)  
Remeasurement of defined benefit plans of group companies (522) (150)  
Total other comprehensive income / (loss) (547) (182)  
Ending balance (2,397) (1,850) (1,669)
Aegon N.V [member] | Remeasurement of defined benefit Plans of group companies [member] | Common Share B [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance (1,850) (1,669)  
Ending balance   (1,850) (1,669)
Aegon N.V [member] | Treasury shares [member] | Common Share B [member]      
Disclosure of shareholders equity [line items]      
Beginning balance (337) (325)  
Issuance and purchase of treasury shares 56    
Treasury shares   (12)  
Ending balance (281) (337) (325)
Aegon N.V [member] | Treasury shares [member] | Common Share B [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance (337) (325)  
Ending balance   (337) (325)
Aegon N.V [member] | Net income /(loss) [member] | Common Share B [member]      
Disclosure of shareholders equity [line items]      
Beginning balance 710 2,469  
Net income 2017 retained   (2,469)  
Net income 2018 retained (710)    
Net income 1,239 710  
Owners of Aegon N.V. 529 (1,759)  
Ending balance 1,239 710 2,469
Aegon N.V [member] | Net income /(loss) [member] | Common Share B [member] | Restated [member]      
Disclosure of shareholders equity [line items]      
Beginning balance € 710 2,469  
Ending balance   € 710 € 2,469
[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.
[3] 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 in the consolidated notes for details about this change.