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Financial Risk Management - Summary of Undiscounted Contractual Values by Relevant Maturity Groupings (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Less than 1 year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets € 65 € 54
Financial liabilities 1,110 1,084
Less than 1 year [member] | Borrowings [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 67 54
Less than 1 year [member] | Interests [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 103 170
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  
Less than 1 year [member] | Net cash flows from derivatives liabilities related to currencies and commodities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 17 35
Less than 1 year [member] | Trade payables and other (excluding deferred revenue) [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 920 825
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 6 32
Less than 1 year [member] | Net cash flows from derivative assets related to currencies and commodities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 59 22
Between 1 and 5 years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 18 85
Financial liabilities 780 1,901
Between 1 and 5 years [member] | Borrowings [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 318 1,329
Between 1 and 5 years [member] | Interests [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 421 490
Between 1 and 5 years [member] | Net debt derivative liabilities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 10  
Between 1 and 5 years [member] | Net cash flows from derivatives liabilities related to currencies and commodities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 11 63
Between 1 and 5 years [member] | Trade payables and other (excluding deferred revenue) [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 20 19
Between 1 and 5 years [member] | Net debt derivative assets [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 3 82
Between 1 and 5 years [member] | Net cash flows from derivative assets related to currencies and commodities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 15 3
More than 5 years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,956 1,127
More than 5 years [member] | Borrowings [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,692 999
More than 5 years [member] | Interests [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities € 264 125
More than 5 years [member] | Net cash flows from derivatives liabilities related to currencies and commodities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities   € 3