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Capital Management and Solvency - Summary of Composition of Available Own Funds Across Tiers (Detail) - New method [member] - Solvency one capital ratio [member] - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of capital management and solvency [line items]    
Total available own funds € 18,470 € 17,602
Unrestricted tier 1 [member]    
Disclosure of capital management and solvency [line items]    
Total available own funds 12,724 12,204
Restricted tier 1 [member]    
Disclosure of capital management and solvency [line items]    
Total available own funds 2,614 3,406
Tier 2 capital [member]    
Disclosure of capital management and solvency [line items]    
Total available own funds 2,370 1,487
Tier 3 capital [member]    
Disclosure of capital management and solvency [line items]    
Total available own funds € 762 € 505