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CONSOLIDATED STATEMENT OF STOCKHOLDER'S EQUITY - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-In Capital
Retained Earnings/ (Accumu-lated Deficit)
Treasury Stock
Accumulated Other Comprehensive Income/(Loss)
Noncon- trolling Interest
NRG Yield
NRG Yield, Inc.
NRG Yield, Inc.
Noncon- trolling Interest
Balance at Dec. 31, 2014 $ 11,676 $ 4 $ 8,327 $ 3,588 $ (1,983) $ (174) $ 1,914      
Increase (Decrease) in Stockholders' Equity                    
Net loss (6,419)     (6,382)     (37)      
Other comprehensive income (loss) 1         1        
Other comprehensive income (loss) portion attributable to noncontrolling interest             (4)      
Other comprehensive income (loss), including OCI for NCI (3)                  
Sale of assets to NRG Yield, Inc.     (56)       83 $ 27    
ESPP share purchases 6   (1)   7          
Equity-based compensation 24   26 (2)            
Purchase of treasury stock (437)       (437)          
Common stock dividends (191)     (191)            
Preferred stock dividends (20)     (20)            
Distributions to redeemable noncontrolling interest (159)           (159)      
Gain on redemption of preferred shares 0                  
Contributions from noncontrolling interests 234           234      
Acquisition of noncontrolling interests by NRG Yield, Inc.             74 74    
Impact of NRG Yield, Inc. public offering 599           599      
Equity component of NRG Yield, Inc. convertible notes 23           23      
Balance at Dec. 31, 2015 5,434 4 8,296 (3,007) (2,413) (173) 2,727      
Increase (Decrease) in Stockholders' Equity                    
Net loss (853)     (774)     (79)      
Other comprehensive income (loss) 38         38        
Other comprehensive income (loss), including OCI for NCI 38                  
Sale of assets to NRG Yield, Inc.     59       (16) 43    
ESPP share purchases 6   (2) (6) 14          
Equity-based compensation 6   5 1            
Common stock dividends (74)     (74)            
Preferred stock dividends (5)     (5)            
Distributions to redeemable noncontrolling interest (158)           (158)   $ (92) $ (92)
Gain on redemption of preferred shares 78     78            
Contributions from noncontrolling interests 30           30      
Redemption of noncontrolling interests (7)           (7)      
Balance at Dec. 31, 2016 4,446 4 8,358 (3,787) (2,399) (135) 2,405      
Increase (Decrease) in Stockholders' Equity                    
Net loss (2,251)     (2,153)     (98)      
Other comprehensive income (loss) 63         51        
Other comprehensive income (loss), including OCI for NCI 51                  
Sale of assets to NRG Yield, Inc.     (25)       20 $ (5)    
ESPP share purchases 6   (3) (4) 13          
Equity-based compensation 29   29            
Common stock dividends (38)     (38)            
Distributions to redeemable noncontrolling interest (65)           (65)   $ (108) $ (108)
Gain on redemption of preferred shares 0                  
Contributions from noncontrolling interests 160           160      
Cumulative effect adjustment (257)   17 (286)   12        
Balance at Dec. 31, 2017 $ 1,968 $ 4 $ 8,376 $ (6,268) $ (2,386) $ (72) $ 2,314