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SHAREOWNERS’ EQUITY - Redeemable Noncontrolling Interests (Narrative) (Details)
€ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2018
EUR (€)
Mar. 31, 2018
joint_venture
Dec. 31, 2015
joint_venture
Redeemable Noncontrolling Interest [Line Items]      
Number of joint ventures formed | joint_venture   4 3
Grid Technology Joint Venture | Scenario, Forecast      
Redeemable Noncontrolling Interest [Line Items]      
Amount to be paid to exercise redemption rights € 1,828    
Renewable Energy Joint Venture | Scenario, Forecast      
Redeemable Noncontrolling Interest [Line Items]      
Amount to be paid to exercise redemption rights € 636    
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%  
Renewable Energy Joint Venture      
Redeemable Noncontrolling Interest [Line Items]      
Annual accretion (as a percent)   3.00%