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Employees - Summary of Assets, Liabilities and Surplus/ (Deficit) Position of Pension and Other Post-Employment Benefit Plans at Balance Sheet Date (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]    
Fair value of assets € 20,867 € 22,361
Other Post-Employment Benefit Plans [Member]    
Disclosure of defined benefit plans [line items]    
Pension liability net of assets (453) (502)
Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Surplus [Member]    
Disclosure of defined benefit plans [line items]    
Pension liability net of assets 1 3
Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Deficit [Member]    
Disclosure of defined benefit plans [line items]    
Pension liability net of assets (18) (17)
Other Post-Employment Benefit Plans [Member] | Unfunded Pension Plans [Member]    
Disclosure of defined benefit plans [line items]    
Pension liability net of assets (436) (488)
Assets [Member] | Other Post-Employment Benefit Plans [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of assets 13 21
Assets [Member] | Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Surplus [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of assets 1 3
Assets [Member] | Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Deficit [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of assets 12 18
Liabilities [Member] | Other Post-Employment Benefit Plans [Member]    
Disclosure of defined benefit plans [line items]    
Present value of liabilities (466) (523)
Liabilities [Member] | Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Deficit [Member]    
Disclosure of defined benefit plans [line items]    
Present value of liabilities (30) (35)
Pension Plans [Member]    
Disclosure of defined benefit plans [line items]    
Pension liability net of assets (421) (59)
Pension Plans [Member] | Funded Pension Plans in Surplus [Member]    
Disclosure of defined benefit plans [line items]    
Pension liability net of assets 1,727 2,170
Pension Plans [Member] | Funded Pension Plans in Deficit [Member]    
Disclosure of defined benefit plans [line items]    
Pension liability net of assets (1,191) (1,208)
Pension Plans [Member] | Unfunded Pension Plans [Member]    
Disclosure of defined benefit plans [line items]    
Pension liability net of assets (957) (1,021)
Pension Plans [Member] | Assets [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of assets 20,867 22,361
Pension Plans [Member] | Assets [Member] | Funded Pension Plans in Surplus [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of assets 17,909 19,302
Pension Plans [Member] | Assets [Member] | Funded Pension Plans in Deficit [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of assets 2,958 3,059
Pension Plans [Member] | Liabilities [Member]    
Disclosure of defined benefit plans [line items]    
Present value of liabilities (21,288) (22,420)
Pension Plans [Member] | Liabilities [Member] | Funded Pension Plans in Surplus [Member]    
Disclosure of defined benefit plans [line items]    
Present value of liabilities (16,182) (17,132)
Pension Plans [Member] | Liabilities [Member] | Funded Pension Plans in Deficit [Member]    
Disclosure of defined benefit plans [line items]    
Present value of liabilities € (4,149) € (4,267)