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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($)
shares in Millions, $ in Millions
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Unearned ESOP Compensation [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Total Common Shareholders' Equity Parent [Member]
Noncontrolling Interest [Member]
Beginning Balance (in shares) at Dec. 31, 2013   435            
Beginning Balance at Dec. 31, 2013 $ 18,040 $ 4 $ 6,437 $ (26) $ 56 $ 11,569 $ 18,040 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net Income 921         921 921  
Issuances of common stock, net of issuance cost of less than $1     26 2     28  
Exercise of stock options and other incentive plan activity (in shares)   1            
Exercise of stock options and other incentive plan activity     43       43  
Dividends on common stock           (630) (630)  
Earned compensation under ESOP     20 4     24  
Other comprehensive income 3       3   3  
Ending Balance (in shares) at Jun. 30, 2014   436            
Ending Balance at Jun. 30, 2014 $ 18,429 $ 4 6,526 (20) 59 11,860 18,429 0
Beginning Balance (in shares) at Dec. 31, 2014 443 443            
Beginning Balance at Dec. 31, 2014 $ 20,168 $ 4 7,193 (14) (40) 12,773 19,916 252
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net Income 1,371         1,366 1,366 5
Issuances of common stock, net of issuance cost of less than $1 (in shares)   8            
Issuances of common stock, net of issuance cost of less than $1   $ 1 626 2     629  
Exercise of stock options and other incentive plan activity (in shares)   1            
Exercise of stock options and other incentive plan activity     17       17  
Dividends on common stock           (683) (683)  
Earned compensation under ESOP     20 3     23  
Other comprehensive income $ 34       36   36 (2)
Sale of NEER assets to NEP     34       34 17
Distributions to noncontrolling interests               (7)
Other changes in noncontrolling interests in subsidiaries               (2)
Ending Balance (in shares) at Jun. 30, 2015 452 452            
Ending Balance at Jun. 30, 2015 $ 21,601 $ 5 $ 7,890 $ (9) $ (4) $ 13,456 $ 21,338 $ 263