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Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]    
Preferred stock outstanding $ 1,265 $ 1,265
Preferred stock, shares outstanding (shares) 1,265 1,265
6.0% Non-Cumulative Preferred Stock, Series I    
Class of Stock [Line Items]    
Preferred stock, shares outstanding (shares) 1,265  
Dividend Rate 6.00%  
Preferred stock, redemption price per share (usd per share) $ 1,000,000