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Pensions and Other Post-employment Benefit Obligations - Summary of Benefit Payments Expected Paid Either by Pension Funds or Directly to Beneficiaries (Detail)
€ in Millions
 12 Months Ended
Dec. 31, 2018
EUR (€)
Statement of financial position [abstract]  
2019 € 53
2020 49
2021 52
2022 54
2023 56
2024 to 2028 € 290