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Employee Incentive Plans (Share Grants And Fair Value) (Details) - USD ($) $ in Millions | 12 Months Ended | 68 Months Ended | 113 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2016
Employee Incentive Plans [Abstract] |  |  |  |  |  |
Shares granted | 1,211,533 | [1] | 1,709,968 | 1,894,046 | 17,284,454 |
Fair Value - Date of Grant | $ 52 |  | $ 49 | $ 46 | $ 302 |
Shares Granted IPO to Date |  |  |  |  |  | 22,100,001
Fair Value - Date of Grant IPO to Date |  |  |  |  |  | $ 449
[1] | Stock Incentive Plan number of granted shares related to 2015 was adjusted by 12,454 additional shares during the nine months ended September, 30, 2016.

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