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Employee Incentive Plans (Share Grants And Fair Value) (Details) - USD ($) $ in Millions | 12 Months Ended | 80 Months Ended | 122 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2017
Employee Incentive Plans [Abstract] |  |  |  |  |  |
Shares granted | 1,451,136 | [1] | 1,211,533 | 1,709,968 | 19,178,500 |
Fair Value - Date of Grant | $ 55 |  | $ 52 | $ 49 | $ 348 |
Shares Granted IPO to Date |  |  |  |  |  | 23,551,137
Fair Value - Date of Grant IPO to Date |  |  |  |  |  | $ 504
[1] | Stock Incentive Plan number of granted shares related to 2016 was adjusted by 5,657 additional shares during the six months ended June 30, 2017.

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