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Shareholders Equity (Details - Stock) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 16, 2018
Feb. 08, 2018
Dec. 06, 2017
Aug. 02, 2017
Feb. 02, 2017
Aug. 25, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 20, 2017
Class of Stock [Line Items]                    
Preferred stock, shares outstanding             403,000 400,000    
Preferred stock, amount outstanding             $ 689 $ 394    
Preferred stock, shares issued             403,000 400,000    
Proceeds from issuance of preferred stock             $ 300 $ 400 $ 0  
Preferred stock, par value             $ 0.01 $ 0.01    
Preferred stock dividend declared             $ 25      
Common Stock                    
Share Repurchases                    
Repurchases of stock, authorized amount                   $ 1,000
Repurchase of stock, aggregate amount             $ 362      
Repurchase of stock, aggregate shares             8,500,000      
Repurchases of stock, remaining authorized amount             $ 638      
Repurchases of common stock, shares             9,000,000 19,000,000 2,000,000  
Common Stock | Subsequent Event [Member]                    
Share Repurchases                    
Repurchases of common stock, shares 1,100,000                  
Average repurchase price $ 49.99                  
Series A Preferred Stock [Member]                    
Class of Stock [Line Items]                    
Preferred stock, dividend rate, percentage             5.875%      
Preferred stock, date of change in dividend rate from fixed to floating             Sep. 15, 2026      
Preferred stock, shares outstanding             400,000      
Preferred stock, liquidation preference per share           $ 1,000 $ 1,000      
Preferred stock, amount outstanding           $ 394 $ 394 $ 394    
Preferred stock, shares issued           400,000        
Proceeds from issuance of preferred stock           $ 400        
Preferred stock, par value           $ 0.01        
Preferred stock dividend declared       $ 12 $ 13          
Preferred stock holders of record, date of record       Aug. 31, 2017 Feb. 28, 2017          
Preferred stock dividends, date to be paid       Sep. 15, 2017 Mar. 15, 2017          
Preferred stock dividend declared, per share       $ 29.38 $ 32.64          
Series A Preferred Stock [Member] | LIBOR [Member]                    
Class of Stock [Line Items]                    
Preferred stock, basis spread on variable rate             4.435%      
Series A Preferred Stock [Member] | Subsequent Event [Member]                    
Preferred stock dividend declared   $ 12                
Preferred stock holders of record, date of record   Feb. 28, 2018                
Preferred stock dividends, date to be paid   Mar. 15, 2018                
Preferred stock dividend declared, per share   $ 29.38                
Series B Preferred Stock [Member]                    
Class of Stock [Line Items]                    
Preferred stock, dividend rate, percentage             5.30%      
Preferred stock, date of change in dividend rate from fixed to floating             Mar. 15, 2023      
Preferred stock, shares outstanding             3,000      
Preferred stock, liquidation preference per share     $ 100,000       $ 100,000      
Preferred stock, liquidation preference per depositary share     $ 1,000              
Preferred stock, amount outstanding     $ 295       $ 295 $ 0    
Preferred stock, depositary shares issued     300,000              
Proceeds from issuance of preferred stock     $ 300              
Preferred stock, par value     $ 0.01              
Series B Preferred Stock [Member] | LIBOR [Member]                    
Class of Stock [Line Items]                    
Preferred stock, basis spread on variable rate             3.16%