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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
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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

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