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Employees - Summary of the Assets, Liabilities and Surplus/(Deficit) Position of the Pension and Other Post-Employment Benefit Plans at the Balance Sheet Date (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of defined benefit plans [Line Items]      
Fair value of assets € 22,361 € 21,162  
Present value of liabilities (1,171) (2,453) € (1,473)
Other post-employment benefit plans [member]      
Disclosure of defined benefit plans [Line Items]      
Pension liability net of assets (502) (584)  
Other post-employment benefit plans [member] | Funded Pension Plans in Surplus [member]      
Disclosure of defined benefit plans [Line Items]      
Pension liability net of assets 3 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 (17) (18)  
Other post-employment benefit plans [member] | Unfunded Pension Plans [member]      
Disclosure of defined benefit plans [Line Items]      
Pension liability net of assets (488) (569)  
Assets [member] | Other post-employment benefit plans [member]      
Disclosure of defined benefit plans [Line Items]      
Fair value of assets 21 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 3 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 18 18  
Liabilities [member] | Other post-employment benefit plans [member]      
Disclosure of defined benefit plans [Line Items]      
Present value of liabilities (523) (605)  
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 (35) (36)  
Aggregate Surplus [Member] | Other post-employment benefit plans [member] | Funded Pension Plans in Surplus [member]      
Disclosure of defined benefit plans [Line Items]      
Pension liability net of assets 3 3  
Pension Plans [member]      
Disclosure of defined benefit plans [Line Items]      
Pension liability net of assets (59) (2,589)  
Pension Plans [member] | Funded Pension Plans in Surplus [member]      
Disclosure of defined benefit plans [Line Items]      
Pension liability net of assets 2,170 691  
Pension Plans [member] | Funded Pension Plans in Deficit [member]      
Disclosure of defined benefit plans [Line Items]      
Pension liability net of assets (1,208) (2,145)  
Pension Plans [member] | Unfunded Pension Plans [member]      
Disclosure of defined benefit plans [Line Items]      
Pension liability net of assets (1,021) (1,135)  
Pension Plans [member] | Assets [member]      
Disclosure of defined benefit plans [Line Items]      
Fair value of assets 22,361 21,162  
Pension Plans [member] | Assets [member] | Funded Pension Plans in Surplus [member]      
Disclosure of defined benefit plans [Line Items]      
Fair value of assets 19,302 6,524  
Pension Plans [member] | Assets [member] | Funded Pension Plans in Deficit [member]      
Disclosure of defined benefit plans [Line Items]      
Fair value of assets 3,059 14,638  
Pension Plans [member] | Liabilities [member]      
Disclosure of defined benefit plans [Line Items]      
Present value of liabilities (22,420) (23,751)  
Pension Plans [member] | Liabilities [member] | Funded Pension Plans in Surplus [member]      
Disclosure of defined benefit plans [Line Items]      
Present value of liabilities (17,132) (5,833)  
Pension Plans [member] | Liabilities [member] | Funded Pension Plans in Deficit [member]      
Disclosure of defined benefit plans [Line Items]      
Present value of liabilities (4,267) (16,783)  
Pension Plans [member] | Aggregate Surplus [Member] | Funded Pension Plans in Surplus [member]      
Disclosure of defined benefit plans [Line Items]      
Pension liability net of assets € 2,170 € 691