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Defined Benefit Plans - Summary of Breakdown of Plan Assets for Retirement of Benefit Plans (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of fair value of plan assets [Line Items] |  |
Equity instruments | € 164 | € 111
Debt instrument | 826 | 712
Real estate | 119 | 111
Derivatives | 57 | 149
Investment funds | 2,487 | 1,956
Other | 767 | 484
At December 31 | € 4,420 | € 3,525
Equity instruments | 4.00% | 3.00%
Debt instrument | 19.00% | 20.00%
Real estate | 3.00% | 3.00%
Derivatives | 1.00% | 4.00%
Investment funds | 56.00% | 55.00%
Other | 17.00% | 14.00%
At December 31 | 100.00% | 100.00%
Quoted Plan Assets [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity instruments | € 160 | € 106
Debt instrument | 465 | 369
Investment funds | 3 | 11
Other | 15 | 14
At December 31 | 644 | 500
Unquoted plan assets [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity instruments | 3 | 5
Debt instrument | 361 | 343
Real estate | 119 | 111
Derivatives | 57 | 149
Investment funds | 2,484 | 1,945
Other | 752 | 471
At December 31 | € 3,776 | € 3,025

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