Results From Financial Transactions - Summary of Net Fair Value Change on for Account of Policyholder Financial Assets at Fair Value Through Profit or Loss (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	[1]	Dec. 31, 2020	[1]
Disclosure of financial instruments at fair value through profit or loss [line items]
Net fair value changes of financial assets at fair value through profit or loss	€ (35,951)	€ 22,539		€ 19,935
Shares [member]
Disclosure of financial instruments at fair value through profit or loss [line items]
Net fair value changes of financial assets at fair value through profit or loss	(2,799)	2,661		1,290
Debt securities and money market investments [member]
Disclosure of financial instruments at fair value through profit or loss [line items]
Net fair value changes of financial assets at fair value through profit or loss	(2,114)	(557)		485
Unconsolidated investment funds [member]
Disclosure of financial instruments at fair value through profit or loss [line items]
Net fair value changes of financial assets at fair value through profit or loss	(30,326)	20,833		17,670
Derivatives [member]
Disclosure of financial instruments at fair value through profit or loss [line items]
Net fair value changes of financial assets at fair value through profit or loss	€ (712)	€ (398)		€ 489

[1] Amounts for 2021 and 2020 have been re-presented to reflect the classification of Aegon the Netherlands as held for sale and discontinued operations, refer to note 51 Discontinued operations.