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Financial Risk Management - Summary of Undiscounted Contractual Financial Assets and Financial Liabilities Values by Relevant Maturity Groupings (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Less than 1 year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets € 27 € 65
Financial liabilities 1,079 1,110
Less than 1 year [member] | Borrowings [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 6 67
Less than 1 year [member] | Interests [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 114 103
Less than 1 year [member] | Net debt derivative liabilities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 3 3
Less than 1 year [member] | Net cash flows from derivative liabilities related to currencies and commodities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 56 17
Less than 1 year [member] | Trade payables and other (excluding deferred revenue and contract liabilities) [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 900 920
Less than 1 year [member] | Net debt derivative assets [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 5 6
Less than 1 year [member] | Net cash flows from derivatives assets related to currencies and commodities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 22 59
Expiring within 5 years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 24 18
Financial liabilities 794 780
Expiring within 5 years [member] | Borrowings [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 315 318
Expiring within 5 years [member] | Interests [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 422 421
Expiring within 5 years [member] | Net debt derivative liabilities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 4 10
Expiring within 5 years [member] | Net cash flows from derivative liabilities related to currencies and commodities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 35 11
Expiring within 5 years [member] | Trade payables and other (excluding deferred revenue and contract liabilities) [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 18 20
Expiring within 5 years [member] | Net debt derivative assets [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 12 3
Expiring within 5 years [member] | Net cash flows from derivatives assets related to currencies and commodities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 12 15
More than 5 years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,927 1,956
More than 5 years [member] | Borrowings [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,754 1,692
More than 5 years [member] | Interests [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities € 173 € 264