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Provisions for contingencies (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]      
Carrying amount € 13,447    
New or increased provisions 1,363    
Initial recognition and changes in estimates (502)    
Accretion discount [1] 249 € 264 € 312
Reversal of utilized provisions (1,443)    
Reversal of unutilized provisions (389)    
Changes in the scope of consolidation (1,051)    
Currency translation differences 210    
Other changes 2    
Carrying amount 11,886 13,447  
Provision For Decommissioning Restoration And Rehabilitation Costs And Social Projects [Member]      
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]      
Carrying amount 8,126    
Initial recognition and changes in estimates (502)    
Accretion discount 259    
Reversal of utilized provisions (190)    
Changes in the scope of consolidation (1,024)    
Currency translation differences 153    
Other changes (45)    
Carrying amount 6,777 8,126  
Environment Related Provision [Member]      
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]      
Carrying amount 2,653    
New or increased provisions 299    
Accretion discount (12)    
Reversal of utilized provisions (287)    
Reversal of unutilized provisions (33)    
Changes in the scope of consolidation (11)    
Other changes (14)    
Carrying amount 2,595 2,653  
Legal proceedings provision [member]      
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]      
Carrying amount 1,107    
New or increased provisions 148    
Accretion discount 2    
Reversal of utilized provisions (214)    
Reversal of unutilized provisions (289)    
Changes in the scope of consolidation (1)    
Currency translation differences 34    
Other changes 37    
Carrying amount 824 1,107  
Provision For Taxes [Member]      
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]      
Carrying amount 527    
New or increased provisions 73    
Reversal of utilized provisions (118)    
Reversal of unutilized provisions (31)    
Changes in the scope of consolidation (8)    
Currency translation differences 17    
Other changes (20)    
Carrying amount 440 527  
Loss adjustments and actuarial provisions [Member]      
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]      
Carrying amount 205    
New or increased provisions 493    
Reversal of utilized provisions (481)    
Other changes 110    
Carrying amount 327 205  
Provision for losses on investments [Member]      
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]      
Carrying amount 182    
New or increased provisions 48    
Reversal of unutilized provisions (1)    
Currency translation differences 2    
Other changes (27)    
Carrying amount 204 182  
Provision for oil insurance cover [Member]      
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]      
Carrying amount 76    
New or increased provisions 51    
Other changes 3    
Carrying amount 130 76  
Provision for redundancy incentives [Member]      
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]      
Carrying amount 140    
New or increased provisions 9    
Reversal of utilized provisions (17)    
Reversal of unutilized provisions (17)    
Changes in the scope of consolidation (5)    
Other changes (2)    
Carrying amount 108 140  
Restructuring provision [member]      
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]      
Carrying amount 65    
New or increased provisions 19    
Reversal of utilized provisions (14)    
Other changes (4)    
Carrying amount 66 65  
Provision for onerous contracts [Member]      
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]      
Carrying amount [2] 60    
Reversal of utilized provisions [2] (22)    
Carrying amount [2] 38 60  
Miscellaneous Other Provisions [Member]      
Disclosure of other Provisions Contingent Liabilities and Contingent Assets Explanatory [Line Items]      
Carrying amount [2] 306    
New or increased provisions [2] 223    
Reversal of utilized provisions [2] (100)    
Reversal of unutilized provisions [2] (18)    
Changes in the scope of consolidation [2] (2)    
Currency translation differences [2] 4    
Other changes [2] (36)    
Carrying amount [2] € 377 € 306  
[1] The item related to the increase in provisions for contingencies that are shown at present value in non-current liabilities.
[2] Each individual amount included herein was lower than €50 million.