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Equity Level 4 (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 27, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Treasury stock acquired |  | 7,800,000 | 0 |  | 16,200,000 |  |
Payments for Repurchase of Common Stock |  | $ 350 | $ 350 |  | $ 700 | $ 500 |
Accelerated Share Repurchases, Final Price Paid Per Share |  | $ 44,740,000 | $ 41,720,000 |  |  |  |
Warrants outstanding |  | 4,200,000 |  |  | 4,200,000 |  | 4,400,000
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 9.197 |  |  | $ 9.197 |  | $ 9.264
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  | 630,000,000 |  |  | 630,000,000 |  |
Warrant [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Warrants Exercised |  | 0 |  | 1,000,000 | 200,000 | 1,600,000 |
Treasury Stock [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  | $ 700 | $ 500 |
Common Stock [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Treasury stock acquired |  |  |  |  | 16,222,000,000 | 12,117,000,000 |
Subsequent Event [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 89 |  |  |  |  |  |
Treasury stock acquired | 2,000,000 |  |  |  |  |  |

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