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Treasury Risk Management - Summary of Derivatives Used to Hedge (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about hedges [Line Items]    
Financial assets € 4,762 € 4,654
Trade payables and other liabilities (14,126) (14,538)
Current financial liabilities (7,968) (5,450)
Non-current financial liabilities (16,462) (11,145)
Designation of Hedge Relationship of Derivatives [member]    
Disclosure of detailed information about hedges [Line Items]    
Trade and other receivable 57 135
Financial assets 116 91
Trade payables and other liabilities (113) (146)
Current financial liabilities (86) (175)
Non-current financial liabilities (335) (10)
Total (361) (105)
Derivative Used to Hedge [member]    
Disclosure of detailed information about hedges [Line Items]    
Financial assets 173 226
Non-current financial liabilities (534) (331)
Total (361) (105)
Fair Value Hedges [member] | Interest rate swap contract [member] | Designation of Hedge Relationship of Derivatives [member]    
Disclosure of detailed information about hedges [Line Items]    
Financial assets 2 3
Total 2 3
Cash Flow Hedges [member] | Foreign exchange derivatives including cross currency swaps [member] | Designation of Hedge Relationship of Derivatives [member]    
Disclosure of detailed information about hedges [Line Items]    
Trade and other receivable 32 36
Trade payables and other liabilities (40) (76)
Total (8) (40)
Cash Flow Hedges [member] | Interest rate swap contract [member] | Designation of Hedge Relationship of Derivatives [member]    
Disclosure of detailed information about hedges [Line Items]    
Financial assets 2 4
Current financial liabilities (18)  
Non-current financial liabilities (335) (4)
Total (351)  
Cash Flow Hedges [member] | Commodity Contracts [member] | Designation of Hedge Relationship of Derivatives [member]    
Disclosure of detailed information about hedges [Line Items]    
Trade and other receivable 12 21
Trade payables and other liabilities (19) (3)
Total (7) 18
Hedges of Net Investment in Foreign Operations [member] | Foreign exchange derivatives including cross currency swaps [member]    
Disclosure of detailed information about hedges [Line Items]    
Financial assets (103) 174
Hedges of Net Investment in Foreign Operations [member] | Foreign exchange derivatives including cross currency swaps [member] | Designation of Hedge Relationship of Derivatives [member]    
Disclosure of detailed information about hedges [Line Items]    
Financial assets 9 174
Current financial liabilities (103) (27)
Total (94) 147
Hedge Accounting Not Applied [Member] | Foreign exchange derivatives including cross currency swaps [member] | Designation of Hedge Relationship of Derivatives [member]    
Disclosure of detailed information about hedges [Line Items]    
Trade and other receivable 13 79
Financial assets 73 (133)
Trade payables and other liabilities (54) (67)
Current financial liabilities 35 (134)
Total 67 (255)
Hedge Accounting Not Applied [Member] | Interest rate swap contract [member] | Designation of Hedge Relationship of Derivatives [member]    
Disclosure of detailed information about hedges [Line Items]    
Financial assets 30 43
Current financial liabilities   (14)
Non-current financial liabilities   (6)
Total € 30 23
Hedge Accounting Not Applied [Member] | Commodity Contracts [member] | Designation of Hedge Relationship of Derivatives [member]    
Disclosure of detailed information about hedges [Line Items]    
Trade and other receivable   (1)
Total   € (1)