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Fair Value - Effect of Changes in Significant Unobservable Assumptions to Reasonably Possible Alternatives (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Fair Value Financial Assets And Liabilities [abstract] |  |
Fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, liabilities | € 3,072 | € 2,484
Increase in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, liabilities | 158 | 131
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, liabilities | € (152) | € (126)

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- Definition Decrease in Fair Value Measurement Due to Change in Unobservable Inputs to Reflect Reasonably Possible Alternative Assumptions, Liabilities. + References No definition available. + Details
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- Definition Disclosure Of Fair Value Financial Assets And Liabilities [abstract] + References No definition available. + Details
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- Definition Fair Value Measurement Change in One or More Unobservable Inputs to Reflect Reasonably Possible Alternative Assumptions, Liabilities. + References No definition available. + Details
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- Definition Increase in Fair Value Measurement Due to Change in One or More Unobservable Inputs to Reflect Reasonably Possible Alternative Assumptions, Liabilities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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