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Equity Level 4 (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 24, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding |  | 2.3 |  |  |  | 2.3 |  | 4.0
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 9.030 |  |  |  | $ 9.030 |  | $ 9.126
Stock Repurchase Program, Authorized Amount |  | $ 1,300 |  |  |  | $ 1,300 |  |
Treasury stock acquired |  | 6.0 | 6.6 | 6.7 |  | 19.3 |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 325 | $ 325 | $ 325 |  | $ 975 |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 54,350,000 | $ 49,340,000 | $ 48,470,000 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 325 | $ 650 | $ 975 |  | $ 325 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired | 0.9 |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 52 |  |  |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Warrants Exercised |  | 0.6 |  |  | 0.1 | 1.7 | 0.3 |

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