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Financial Risks - Summary of Amortized Cost and Fair Value of Debt Securities (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of additional information on credit risk, unrealized losses and impairments [line items] |  |
Unrealized losses | € 345 | € 1,550
Total fair value | 9,080 | 8,597
Debt securities and money market instruments Americas and Netherland [member] |  |
Disclosure of additional information on credit risk, unrealized losses and impairments [line items] |  |
Amortized cost | 69,012 | 72,520
Unrealized gains | 10,493 | 4,336
Unrealized losses | (327) | (1,352)
Total fair value | 79,178 | 75,504
Fair value of instruments with unrealized gains | 74,025 | 50,976
Fair value of instruments with unrealized losses | 5,153 | 24,528
Debt securities and money market instruments [member] |  |
Disclosure of additional information on credit risk, unrealized losses and impairments [line items] |  |
Amortized cost | 78,052 | 81,073
Unrealized gains | 11,289 | 4,673
Unrealized losses | (345) | (1,550)
Total fair value | 88,995 | 84,196
Fair value of instruments with unrealized gains | 83,192 | 55,253
Fair value of instruments with unrealized losses | 5,803 | 28,943
Debt securities and money market instruments [member] | United States government [member] |  |
Disclosure of additional information on credit risk, unrealized losses and impairments [line items] |  |
Amortized cost | 7,443 | 6,973
Unrealized gains | 1,377 | 603
Unrealized losses | (8) | (127)
Total fair value | 8,812 | 7,449
Fair value of instruments with unrealized gains | 8,478 | 4,772
Fair value of instruments with unrealized losses | 335 | 2,676
Debt securities and money market instruments [member] | Dutch government [member] |  |
Disclosure of additional information on credit risk, unrealized losses and impairments [line items] |  |
Amortized cost | 4,869 | 4,908
Unrealized gains | 1,448 | 1,136
Unrealized losses |  | (3)
Total fair value | 6,316 | 6,040
Fair value of instruments with unrealized gains | 6,267 | 6,002
Fair value of instruments with unrealized losses | 49 | 38
Debt securities and money market instruments [member] | Other government [member] |  |
Disclosure of additional information on credit risk, unrealized losses and impairments [line items] |  |
Amortized cost | 8,901 | 11,327
Unrealized gains | 2,989 | 684
Unrealized losses | (17) | (54)
Total fair value | 11,872 | 11,957
Fair value of instruments with unrealized gains | 11,662 | 11,105
Fair value of instruments with unrealized losses | 210 | 852
Debt securities and money market instruments [member] | Insured residential mortgage backed securities [member] |  |
Disclosure of additional information on credit risk, unrealized losses and impairments [line items] |  |
Amortized cost | 6,366 | 6,275
Unrealized gains | 470 | 366
Unrealized losses | (25) | (84)
Total fair value | 6,811 | 6,557
Fair value of instruments with unrealized gains | 5,773 | 3,700
Fair value of instruments with unrealized losses | 1,037 | 2,857
Debt securities and money market instruments [member] | Asset backed securities [member] |  |
Disclosure of additional information on credit risk, unrealized losses and impairments [line items] |  |
Amortized cost | 3,776 | 4,948
Unrealized gains | 103 | 65
Unrealized losses | (9) | (55)
Total fair value | 3,869 | 4,958
Fair value of instruments with unrealized gains | 2,881 | 1,825
Fair value of instruments with unrealized losses | 989 | 3,133
Debt securities and money market instruments [member] | Corporate [member] |  |
Disclosure of additional information on credit risk, unrealized losses and impairments [line items] |  |
Amortized cost | 40,552 | 39,770
Unrealized gains | 4,853 | 1,748
Unrealized losses | (167) | (1,138)
Total fair value | 45,238 | 40,379
Fair value of instruments with unrealized gains | 42,801 | 21,441
Fair value of instruments with unrealized losses | 2,437 | 18,939
Debt securities and money market instruments [member] | Money market investments [member] |  |
Disclosure of additional information on credit risk, unrealized losses and impairments [line items] |  |
Amortized cost | 5,169 | 5,955
Total fair value | 5,169 | 5,955
Fair value of instruments with unrealized gains | 4,702 | 5,701
Fair value of instruments with unrealized losses | 467 | 254
Debt securities and money market instruments [member] | Other [member] |  |
Disclosure of additional information on credit risk, unrealized losses and impairments [line items] |  |
Amortized cost | 976 | 919
Unrealized gains | 49 | 71
Unrealized losses | (117) | (88)
Total fair value | 908 | 902
Fair value of instruments with unrealized gains | 628 | 707
Fair value of instruments with unrealized losses | € 280 | € 194

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