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Transfers of Financial Assets - Summary of Reverse Repurchase Agreements (Detail) - Reverse repurchase agreements [member] - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]    
Cash paid for reverse repurchase agreements € 4,980 € 2,195
Fair value of non-cashcollateral received 5,003 2,224
Net exposure (23) (29)
Non-cash collateral that can be sold or repledged in the absence of default 4,640 1,740
Non-cash collateral that has been sold or transferred