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Employee Incentive Plans (Share Grants And Fair Value) (Details) - USD ($)
$ in Millions
 12 Months Ended 92 Months Ended 128 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2017
Employee Incentive Plans [Abstract]          
Shares granted 923,407 1,451,136 [1] 1,211,533 20,888,468  
Fair Value - Date of Grant $ 55 $ 55 $ 52 $ 397 $ 55
Shares Granted IPO to Date         24,474,544
Fair Value - Date of Grant IPO to Date         $ 559
[1] Stock Incentive Plan number of granted restricted stock units related to 2016 was adjusted by 5,657 additional restricted stock units during the year ended December 31, 2017.Granted under the Company's amended 2007 Stock Incentive Plan, pending stockholder approval at the Company's 2018 Annual Meeting.