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Assets and Liabilities Held for Sale - Summary of Assets and Liabilities Classified as Held for Sale (Parenthetical) (Detail) - EUR (€)
€ in Billions
 6 Months Ended
Jul. 02, 2018
Jun. 30, 2018
'South Africa spreads business [member]    
Non-current Assets Held for Sale [Line Items]    
Completion date   Jul. 02, 2018
Global spreads business (excluding South Africa) [member]    
Non-current Assets Held for Sale [Line Items]    
Completion date   Jul. 02, 2018
Global spreads business (excluding South Africa) [member] | Disposal of business [member]    
Non-current Assets Held for Sale [Line Items]    
Consideration paid (received) € (7.3)