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Pensions and Other Post-employment Benefit Obligations - Details of Movement in Net Defined Benefit Obligations (Detail) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance     € 610  
Closing balance € 672   672  
Consolidated Income Statement [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost 6 € 5 12 € 11
Interest cost / (income)     8  
Immediate recognition of gains / (losses) arising over the period 2   2  
Administration expenses   1 1 1
Statement of Comprehensive Income (Loss) [member]        
Disclosure of net defined benefit liability (asset) [line items]        
- actual return less interest on plan assets     (32)  
- changes in financial assumptions     93  
- changes in demographic assumptions     0  
- experience losses     (1)  
Effects of changes in foreign exchange rates     3  
Consolidated Statement of Cash Flows [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Benefits paid     (12)  
Contributions by the Group     (12)  
Other benefits [member] | Consolidated Income Statement [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost 1 € 2 3 € 3
Immediate recognition of gains / (losses) arising over the period 2   2  
Defined benefit obligations [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance     990  
Closing balance 1,091   1,091  
Defined benefit obligations [member] | Consolidated Income Statement [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost     12  
Interest cost / (income)     13  
Immediate recognition of gains / (losses) arising over the period     2  
Defined benefit obligations [member] | Statement of Comprehensive Income (Loss) [member]        
Disclosure of net defined benefit liability (asset) [line items]        
- changes in financial assumptions     93  
- changes in demographic assumptions     0  
- experience losses     (1)  
Effects of changes in foreign exchange rates     7  
Defined benefit obligations [member] | Consolidated Statement of Cash Flows [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Benefits paid     (27)  
Contributions by the plan participants     2  
Defined benefit obligations [member] | Pension benefits [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance     789  
Closing balance 876   876  
Defined benefit obligations [member] | Pension benefits [member] | Consolidated Income Statement [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost     9  
Interest cost / (income)     9  
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     77  
- changes in demographic assumptions     0  
Effects of changes in foreign exchange rates     6  
Defined benefit obligations [member] | Pension benefits [member] | Consolidated Statement of Cash Flows [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Benefits paid     (16)  
Contributions by the plan participants     2  
Defined benefit obligations [member] | Other benefits [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance     201  
Closing balance 215   215  
Defined benefit obligations [member] | Other benefits [member] | Consolidated Income Statement [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost     3  
Interest cost / (income)     4  
Immediate recognition of gains / (losses) arising over the period     2  
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     16  
- changes in demographic assumptions     0  
- experience losses     (1)  
Effects of changes in foreign exchange rates     1  
Defined benefit obligations [member] | Other benefits [member] | Consolidated Statement of Cash Flows [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Benefits paid     (11)  
Plan Assets [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance     (380)  
Closing balance € (419)   (419)  
Plan Assets [member] | Consolidated Income Statement [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Current service cost     0  
Interest cost / (income)     (5)  
Immediate recognition of gains / (losses) arising over the period     0  
Administration expenses     1  
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     (32)  
- changes in demographic assumptions     0  
Effects of changes in foreign exchange rates     (4)  
Plan Assets [member] | Consolidated Statement of Cash Flows [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Benefits paid     15  
Contributions by the Group     (12)  
Contributions by the plan participants     € (2)