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Common Stock And Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Common stock, shares outstanding 492,025,443 475,913,404
Dividend per share $ 0.455  
Debt covenant ratio of total consolidated debt to total consolidated capitalization percentage 65.00%  
Percentage of equity for capital structure to be maintained 52.00%  
Common stock $ 11,282.0 $ 10,421.0
Equity Contract [Member]    
Equity distribution agreement amount $ 500.0  
Common stock shares issued 1,400,000  
Fees and Commissions $ 1.0  
Common stock $ 74.0  
Underwritten Public Offering [Member]    
Sale of common stock in an underwritten public offering 6,800,000  
Common stock issued, amount $ 352.0  
Four Zero One K Plan D R S P P Shared Based Compensation Plans [Member]    
Common stock shares issued 7,900,000  
Common stock $ 354.0  
Utility [Member]    
Net restricted assets for revolving credit facility ratio requirement 1,520.0  
Net restricted assets for equity component requirement 15,200.0  
Additional Common Stock Dividends $ 110.0