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Pensions and Other Post-employment Benefit Obligations - Details of Movement in Net Defined Benefit Obligations (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance € 664 € 735
Closing balance 610 664
Consolidated Income Statement [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 24 24
Interest cost / (income) 15 17
Past service cost (36) (20)
Immediate recognition of gains / (losses) arising over the year 0 0
Administration expenses 2 3
Statement of Comprehensive Income (Loss) [member]    
Disclosure of net defined benefit liability (asset) [line items]    
-actual return less interest on plan assets 26 (36)
-changes in financial assumptions (45) 37
-changes in demographic assumptions (6) (1)
-experience losses (3)  
Effects of changes in foreign exchange rates 15 (48)
Consolidated Statement of Cash Flows [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Benefits paid (23) (23)
Contributions by the Group (23) (24)
Defined benefit obligations [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance 1,051 1,126
Closing balance 990 1,051
Defined benefit obligations [member] | Consolidated Income Statement [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 24 24
Interest cost / (income) 24 27
Past service cost (36) (20)
Immediate recognition of gains / (losses) arising over the year 0 0
Defined benefit obligations [member] | Statement of Comprehensive Income (Loss) [member]    
Disclosure of net defined benefit liability (asset) [line items]    
-changes in financial assumptions (45) 37
-changes in demographic assumptions (6) (1)
-experience losses (3)  
Effects of changes in foreign exchange rates 31 (90)
Defined benefit obligations [member] | Consolidated Statement of Cash Flows [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Benefits paid (54) (56)
Contributions by the plan participants 4 4
Defined benefit obligations [member] | Pension benefits [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance 801 853
Closing balance 789 801
Defined benefit obligations [member] | Pension benefits [member] | Consolidated Income Statement [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 18 18
Interest cost / (income) 16 18
Past service cost   (16)
Immediate recognition of gains / (losses) arising over the year 0 0
Defined benefit obligations [member] | Pension benefits [member] | Statement of Comprehensive Income (Loss) [member]    
Disclosure of net defined benefit liability (asset) [line items]    
-changes in financial assumptions (30) 23
-changes in demographic assumptions (5)  
-experience losses (1)  
Effects of changes in foreign exchange rates 22 (61)
Defined benefit obligations [member] | Pension benefits [member] | Consolidated Statement of Cash Flows [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Benefits paid (35) (38)
Contributions by the plan participants 3 4
Defined benefit obligations [member] | Other benefits [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance 250 273
Closing balance 201 250
Defined benefit obligations [member] | Other benefits [member] | Consolidated Income Statement [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 6 6
Interest cost / (income) 8 9
Past service cost (36) (4)
Immediate recognition of gains / (losses) arising over the year 0 0
Defined benefit obligations [member] | Other benefits [member] | Statement of Comprehensive Income (Loss) [member]    
Disclosure of net defined benefit liability (asset) [line items]    
-changes in financial assumptions (15) 14
-changes in demographic assumptions (1) (1)
-experience losses (2)  
Effects of changes in foreign exchange rates 9 (29)
Defined benefit obligations [member] | Other benefits [member] | Consolidated Statement of Cash Flows [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Benefits paid (19) (18)
Contributions by the plan participants 1  
Plan Assets [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance (387) (391)
Closing balance (380) (387)
Plan Assets [member] | Consolidated Income Statement [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Interest cost / (income) (9) (10)
Immediate recognition of gains / (losses) arising over the year 0 0
Administration expenses 2 3
Plan Assets [member] | Statement of Comprehensive Income (Loss) [member]    
Disclosure of net defined benefit liability (asset) [line items]    
-actual return less interest on plan assets 26 (36)
Effects of changes in foreign exchange rates (16) 42
Plan Assets [member] | Consolidated Statement of Cash Flows [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Benefits paid 31 33
Contributions by the Group (23) (24)
Contributions by the plan participants € (4) € (4)