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Equity - Preferred Stock (Details) - USD ($)
 12 Months Ended
Dec. 13, 2018
Dec. 31, 2018
Nov. 06, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]          
Issuance of preferred shares   13,800,000   0 0
Preferred Stock, Liquidation Preference, Value   $ 345,000,000   $ 0  
Preferred Stock, Redemption Date   Nov. 15, 2023      
Entity Listing, Depository Receipt Ratio $ 0.4125        
Dividends Payable, Date to be Paid Feb. 15, 2019        
Preferred Stock, end of period          
Class of Stock [Line Items]          
Issuance of preferred shares     13,800,000    
Preferred Stock, Liquidation Preference, Value     $ 25,000    
Share Price     $ 25.00    
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options   $ 334,000,000      
Preferred Stock, Dividend Payment Terms   no      
Other Restrictions on Payment of Dividends   no      
Preferred Stock, Redemption Price Per Share   $ 25,000      
Preferred Stock, Redemption Terms   P90D      
Preferred Stock, Dividends Per Share, Declared $ 412.50        
Rating Agency Event [Member] | Preferred Stock, end of period          
Class of Stock [Line Items]          
Preferred Stock, Redemption Price Per Share   $ 25,500      
Regulatory Capital Event [Member] | Preferred Stock, end of period          
Class of Stock [Line Items]          
Preferred Stock, Redemption Price Per Share   $ 25,000