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SHAREOWNERS’ EQUITY - Redeemable Noncontrolling Interests (Narrative) (Details)
€ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
EUR (€)
Sep. 30, 2018
Dec. 31, 2015
joint_venture
Redeemable Noncontrolling Interest [Line Items]      
Number of joint ventures formed | joint_venture     3
Grid Technology and Renewable Energy Joint Ventures      
Redeemable Noncontrolling Interest [Line Items]      
Annual accretion (as a percent)   3.00%  
Nuclear and French Steam Power Joint Venture      
Redeemable Noncontrolling Interest [Line Items]      
Annual accretion (as a percent)   2.00%  
Amount to be paid to exercise redemption rights € 125    
Renewable Energy Joint Venture      
Redeemable Noncontrolling Interest [Line Items]      
Annual accretion (as a percent)   3.00%  
Amount to be paid to exercise redemption rights 638    
Grid Technology Joint Venture      
Redeemable Noncontrolling Interest [Line Items]      
Amount to be paid to exercise redemption rights € 1,832