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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. 26, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired |  | 8.4 | 7.8 | 8.4 |  | 24.6 |  |
Payments for Repurchase of Common Stock |  | $ 350 | $ 350 | $ 350 |  | $ 1,050 | $ 800 |
Accelerated Share Repurchases, Final Price Paid Per Share |  | $ 41,540,000 | $ 44,740,000 | $ 41,720,000 |  |  |  |
Warrants outstanding |  | 4.1 |  |  |  | 4.1 |  | 4.4
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 9.161 |  |  |  | $ 9.161 |  | $ 9.264
Stock Repurchase Program, Authorized Amount |  | $ 1,300 |  |  |  | $ 1,300 |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  | 280.0 |  |  |  | 280.0 |  |
Warrant [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Warrants Exercised |  | 0.1 |  |  | 1.1 | 0.3 | 2.7 |
Treasury Stock [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  | $ 1,050 | $ 800 |
Common Stock [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired |  |  |  |  |  | 24,652.0 | 18,625.0 |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 85 |  |  |  |  |  |  |
Treasury stock acquired | 2.0 |  |  |  |  |  |  |

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