Transfers of Financial Assets - Summary of Reverse Repurchase Agreements (Detail) - Reverse repurchase agreements [member] - EUR (€) € in Millions	Dec. 31, 2022	[1]	Dec. 31, 2021
Disclosure of financial assets [line items]
Cash paid for reverse repurchase agreements	€ 312		€ 1,004
Fair value of non-cashcollateral received	335		1,025
Net exposure	(23)		(21)
Non-cash collateral that can be sold or repledged in the absence of default	0		695
Non-cash collateral that has been sold or transferred	€ 0		€ 0

[1] 2022 excludes the disposal group, which is separately disclosed in note 51 Discontinued operations.