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Transfers of Financial Assets - Summary of Securities Lending (Detail) - Securities lending [member] - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]    
Carrying amount of transferred financial assets € 2,734 € 3,718
Fair value of cash collateral received 2,146 2,480
Fair value of non-cash collateral received 780 1,356
Net exposure (192) (117)
Non-cash collateral that can be sold or repledged in the absence of default 618 1,171
Non-cash collateral that has been sold or transferred