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Fair Value - Information about Significant Unobservable Inputs (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Significant unobservable input | Credit spread |
Financial assets at fair value | € 148,570 | € 139,834
Debt securities [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | € 86,853 | € 81,253
Level III [member] | Real estate held for own use [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Direct capitalization technique |
Significant unobservable input | Capitalization rate |
Level III [member] | Real estate held for own use [member] | Appraisal value [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Appraisal value |
Significant unobservable input | n.a. |
Level III [member] | Real estate held for own use [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Other |
Significant unobservable input | n.a. |
Level III [member] | Available-for-sale financial assets [member] | Shares [member] | Net asset value [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Net asset value |
Significant unobservable input | n.a. |
Level III [member] | Available-for-sale financial assets [member] | Shares [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Other |
Significant unobservable input | n.a. |
Level III [member] | Available-for-sale financial assets [member] | Debt securities [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Other |
Significant unobservable input | n.a. |
Level III [member] | Available-for-sale financial assets [member] | Debt securities [member] | Broker quote [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Broker quote |
Significant unobservable input | n.a. |
Level III [member] | Available-for-sale financial assets [member] | Debt securities [member] | Credit spread [member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Discounted cash flow |
Range (weighted average) | 3.24% | 3.38%
Level III [member] | Available-for-sale financial assets [member] | Other investments [member] | Net asset value [member] | Investment funds [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Net asset value |
Significant unobservable input | n.a. |
Level III [member] | Available-for-sale financial assets [member] | Other investments [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Other |
Significant unobservable input | n.a. |
Level III [member] | Available-for-sale financial assets [member] | Other investments [member] | Discounted cash flow [member] | Tax credit investments [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Discounted cash flow |
Significant unobservable input | Discount rate |
Range (weighted average) | 6.50% | 6.80%
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Shares [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Other |
Significant unobservable input | n.a. |
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Debt securities [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Other |
Significant unobservable input | n.a. |
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member] | Net asset value [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Net asset value |
Significant unobservable input | n.a. |
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Other |
Significant unobservable input | n.a. |
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Longevity swap [member] | Mortality rates [member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Discounted cash flow |
Significant unobservable input | Mortality |
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Other |
Significant unobservable input | n.a. |
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Direct capitalization technique |
Significant unobservable input | Capitalization rate |
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Other |
Significant unobservable input | n.a. |
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member] | Appraisal value [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Appraisal value |
Significant unobservable input | n.a. |
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member] | Capitalization rates [member] | Direct capitalization technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Significant unobservable input | Capitalization rate |
Level III [member] | Embedded derivatives [member] | Own credit spread [member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Discounted cash flow |
Significant unobservable input | Own credit spread |
Level III [member] | Longevity swap liability [member] | Mortality rates [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Significant unobservable input | Mortality |
Level III [member] | Longevity swap liability [member] | Mortality rates [member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Discounted cash flow |
Level III [member] | Other [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Other |
Significant unobservable input | n.a. |
Level III [member] | Bottom of range [member] | Real estate held for own use [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Range (weighted average) | 7.75% | 8.25%
Level III [member] | Bottom of range [member] | Available-for-sale financial assets [member] | Debt securities [member] | Constant Prepayment Rate [Member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Discounted cash flow |
Significant unobservable input | Constant Prepayment Rate |
Range (weighted average) | 7.82% |
Level III [member] | Bottom of range [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Range (weighted average) | 4.25% | 4.25%
Level III [member] | Bottom of range [member] | Embedded derivatives [member] | Own credit spread [member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Range (weighted average) | 0.20% | 0.25%
Level III [member] | Top of range [member] | Real estate held for own use [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Range (weighted average) | 9.50% | 9.50%
Level III [member] | Top of range [member] | Available-for-sale financial assets [member] | Debt securities [member] | Constant Prepayment Rate [Member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Valuation technique | Discounted cash flow |
Significant unobservable input | Constant Prepayment Rate |
Range (weighted average) | 25.00% |
Level III [member] | Top of range [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Range (weighted average) | 5.50% | 7.50%
Level III [member] | Top of range [member] | Embedded derivatives [member] | Own credit spread [member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Range (weighted average) | 0.30% | 0.40%
Level III [member] | Weighted average [member] | Real estate held for own use [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Range (weighted average) | 9.00% | 8.90%
Level III [member] | Weighted average [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Range (weighted average) | 3.30% | 4.40%
Level III [member] | Weighted average [member] | Embedded derivatives [member] | Own credit spread [member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Range (weighted average) | 0.24% | 0.30%
Level III [member] | Recurring fair value measurement [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | € 8,330 | € 7,592
Level III [member] | Recurring fair value measurement [member] | Derivatives [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 3,081 | 2,489
Level III [member] | Recurring fair value measurement [member] | Investments in real estate [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 6,410 | 5,352
Level III [member] | Recurring fair value measurement [member] | Real estate held for own use [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 208 | 263
Level III [member] | Recurring fair value measurement [member] | Real estate held for own use [member] | Direct capitalization technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 54 | 53
Level III [member] | Recurring fair value measurement [member] | Real estate held for own use [member] | Appraisal value [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 108 | 101
Level III [member] | Recurring fair value measurement [member] | Real estate held for own use [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 46 | 108
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 1,712 | 1,976
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Shares [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 157 | 241
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Shares [member] | Net asset value [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 119 | 205
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Shares [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 38 | 36
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Debt securities [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 1,074 | 1,242
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Debt securities [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 193 | 240
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Debt securities [member] | Broker quote [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 818 | 985
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Debt securities [member] | Credit spread [member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 25 | 17
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Other investments [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 482 | 493
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Other investments [member] | Net asset value [member] | Investment funds [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 14 | 24
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Other investments [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 33 | 34
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Other investments [member] | Discounted cash flow [member] | Tax credit investments [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 435 | 435
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 1,405 | 1,243
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Shares [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 1,401 | 1,226
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Debt securities [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 4 | 17
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 2,049 | 1,376
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member] | Net asset value [member] | Investment funds [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 1,984 | 1,334
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 65 | 42
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 2,901 | 2,700
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member] | Other valuation technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 92 | 123
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member] | Capitalization rates [member] | Direct capitalization technique [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 580 | 427
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member] | Appraisal value [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 2,229 | 2,150
Level III [member] | Recurring fair value measurement [member] | Embedded derivatives [member] | Own credit spread [member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 3,072 | 2,484
Level III [member] | Recurring fair value measurement [member] | Longevity swap liability [member] | Mortality rates [member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 9 | 5
Level III [member] | Recurring fair value measurement [member] | Derivatives [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 55 |
Level III [member] | Recurring fair value measurement [member] | Derivatives [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Longevity swap [member] | Mortality rates [member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 55 | 33
Level III [member] | Recurring fair value measurement [member] | Derivatives [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Derivatives [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value |  | € 33
Level III [member] | Recurring fair value measurement [member] | Bottom of range [member] | Available-for-sale financial assets [member] | Debt securities [member] | Constant Prepayment Rate [Member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | 30 |
Level III [member] | Recurring fair value measurement [member] | Top of range [member] | Constant Prepayment Rate [Member] | Discounted cash flow [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |
Financial assets at fair value | € 7 |

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