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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 |  |  |

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