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Derivatives - Summary of Cash Flows are Expected to Occur (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of future net cash flow [Line Items] |  |
Cash inflows | € 8,165 | € 6,299
Cash outflows | 4 | 5
Net cash flows | 8,160 | 6,294
Not later than 1 year [member] |  |
Disclosure of future net cash flow [Line Items] |  |
Cash inflows | 597 | 95
Net cash flows | 597 | 95
1-5 years [member] |  |
Disclosure of future net cash flow [Line Items] |  |
Cash inflows | 928 | 321
Cash outflows | 1 | 1
Net cash flows | 927 | 320
Over 5 through 10 years [member] |  |
Disclosure of future net cash flow [Line Items] |  |
Cash inflows | 875 | 301
Cash outflows | 3 | 3
Net cash flows | 872 | 297
Over 10 years [member] |  |
Disclosure of future net cash flow [Line Items] |  |
Cash inflows | 5,764 | 5,582
Net cash flows | € 5,764 | € 5,582

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- Definition Cash outflows. + References No definition available. + Details
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- Details
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