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Equity Level 4 (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 25, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Class of Warrant or Right [Line Items] |  |  |  |
Treasury stock acquired |  | 6.7 |  |
Payments for Repurchase of Common Stock |  | $ 325 | $ 350 |
Warrants outstanding |  | 3.0 |  | 4.0
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 9.093 |  | $ 9.126
Stock Repurchase Program, Authorized Amount |  | $ 1,300 |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  | $ 975 |  |
Warrant [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants Exercised |  | 1.0 | 0.2 |
Treasury Stock [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 325 | $ 350 |
Common Stock [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Treasury stock acquired |  | 6,709.0 | 8,394.0 |
Subsequent Event [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 92 |  |  |
Treasury stock acquired | 1.9 |  |  |

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