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Operating Segment Information - Summary of Segment Assets (Detail) - EUR (€)
€ in Millions
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Total Assets € 4,301 € 3,901  
Deferred income tax assets 155 163  
Cash and cash equivalents 213 164 € 269
Other financial assets 26 104  
Segment [member]      
Disclosure of operating segments [line items]      
Total Assets 3,907 3,470  
Segment [member] | P&ARP [member]      
Disclosure of operating segments [line items]      
Total Assets 2,008 1,791  
Segment [member] | A&T [member]      
Disclosure of operating segments [line items]      
Total Assets 861 831  
Segment [member] | AS&I [member]      
Disclosure of operating segments [line items]      
Total Assets 694 544  
Segment [member] | Holdings & Corporate [member]      
Disclosure of operating segments [line items]      
Total Assets 344 304  
Unallocated amounts [member]      
Disclosure of operating segments [line items]      
Deferred income tax assets 155 163  
Cash and cash equivalents 213 164  
Other financial assets € 26 € 104