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Subsequent Event (Details) - USD ($)
$ / shares in Units, $ in Millions
Oct. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Subsequent Event [Line Items]      
Preferred stock, par value (USD per share)   $ 0.01 $ 0.01
Series B Preferred Stock [Member]      
Subsequent Event [Line Items]      
Liquidation preference per share (USD per share)   $ 1,000 $ 1,000
Subsequent Event [Member] | Series F Preferred Stock [Member]      
Subsequent Event [Line Items]      
Shares Issued (in shares) 500,000    
Percentage of ownership 1.00%    
Preferred stock, par value (USD per share) $ 0.01    
Liquidation preference per share (USD per share) 100,000    
Liquidation preference per depositary share (USD per share) $ 1,000    
Dividend rate percentage 5.00%    
Net proceeds from preferred stock offering $ 492    
Subsequent Event [Member] | Series F Preferred Stock [Member] | LIBOR [Member]      
Subsequent Event [Line Items]      
Basis spread on variable rate 2.575%    
Subsequent Event [Member] | Series B Preferred Stock [Member]      
Subsequent Event [Line Items]      
Dividend rate percentage 6.00%