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Commitments and Contingent Liabilities - Summary of Detailed Information about Property Plant and Equipment (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment € 10,411 € 11,673  
Cost [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 19,398 21,207 € 19,917
Accumulated depreciation [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment (8,987) (9,534) (8,859)
Plant and equipment [member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 7,378 8,411  
Plant and equipment [member] | Cost [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 14,936 16,462 15,366
Plant and equipment [member] | Accumulated depreciation [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment (7,558) (8,051) € (7,416)
Finance Leases [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 139 151  
Finance Leases [Member] | Cost [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 331 345  
Finance Leases [Member] | Accumulated depreciation [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment (192) (194)  
Finance Leases [Member] | Buildings [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 122 132  
Finance Leases [Member] | Buildings [Member] | Cost [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 206 211  
Finance Leases [Member] | Buildings [Member] | Accumulated depreciation [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment (84) (79)  
Finance Leases [Member] | Plant and equipment [member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 17 19  
Finance Leases [Member] | Plant and equipment [member] | Cost [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment 125 134  
Finance Leases [Member] | Plant and equipment [member] | Accumulated depreciation [Member]      
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]      
Property plant and equipment € (108) € (115)