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Financial Risks - Summary of Market Risk Concentrations in Shares (Detail) - Concentration Risk By Type [member] - shares
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 2,221 2,161
Financial assets impaired [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 30 33
Communication [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 32 32
Consumer [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 9 7
Consumer [member] | Financial assets impaired [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 2  
Financials [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 455 491
Financials [member] | Financial assets impaired [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 1 3
Funds [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 1,616 1,558
Funds [member] | Financial assets impaired [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 19 26
Industries [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 22 19
Industries [member] | Financial assets impaired [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 4  
Other [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 88 54
Other [member] | Financial assets impaired [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 2 3
Americas [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 499 532
Americas [member] | Communication [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 26 26
Americas [member] | Consumer [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 7 6
Americas [member] | Financials [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 416 466
Americas [member] | Industries [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 21 19
Americas [member] | Other [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 29 15
The Netherlands [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 1,443 1,412
The Netherlands [member] | Financials [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 3 3
The Netherlands [member] | Funds [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 1,440 1,410
The Netherlands [member] | Other [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares   0
United Kingdom [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 17 3
United Kingdom [member] | Funds [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 17 3
Southern & Eastern Europe [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 74 74
Southern & Eastern Europe [member] | Financials [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 3 3
Southern & Eastern Europe [member] | Funds [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 63 69
Southern & Eastern Europe [member] | Other [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 7 2
Asia [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 11 7
Asia [member] | Financials [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 11 7
Asset management [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 5 4
Asset management [member] | Financials [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 2  
Asset management [member] | Industries [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 1  
Asset management [member] | Other [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Market risk concentrations - shares 2 4