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Shareholder's Equity Shareholders Equity (Details - Textuals) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Nov. 19, 2015
Preferred Stock          
Preferred Stock, Shares Authorized 1.0 1.0      
Preferred Stock, Shares Issued 0.0 0.0 0.0    
Preferred Stock, Shares Outstanding 0.0 0.0 0.0    
Debt Conversion [Line Items]          
Conversion of convertible debentures   $ 30 $ 5 $ 0  
Conversion of convertible debentures, shares   2.9 0.5    
Share Repurchases          
Repurchases of common stock   $ 50      
Common Stock          
Debt Conversion [Line Items]          
Conversion of convertible debentures   $ 0 $ 0    
Conversion of convertible debentures, shares   3.0 1.0    
Share Repurchases          
Repurchases of common stock   $ 0      
Repurchases of common stock, shares   2.0      
Common Stock | November 2015 Plan          
Share Repurchases          
Stock Repurchase Program, Authorized Amount         $ 800
Repurchases of common stock $ 50        
Repurchases of common stock, shares 1.7        
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 750 $ 750