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Pensions and Other Post-employment Benefit Obligations - Summary of Benefits Payments Expected Paid Either by Pension Funds or Directly to Beneficiaries (Detail)
€ in Millions
 12 Months Ended
Dec. 31, 2017
EUR (€)
Statement of financial position [abstract]  
2018 € 52
2019 52
2020 52
2021 55
2022 56
2023 to 2027 € 286