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Equity - Capital Purchase Program Warrants (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 30, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  |  |  | 1.9
Treasury Stock, Shares, Acquired |  | 1.1 | 0.5 |  | 1.6 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 63 | $ 27 |  | $ 90 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 0.6 |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 36 |  |  |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Warrants Exercised |  |  |  | 0.1 |  | 1.9 | 0.2 |

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