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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 941,742 [1],[2] 1,451,136 1,211,533 20,888,468  
Fair Value - Date of Grant $ 56 $ 55 $ 52 $ 397 $ 56
Shares Granted IPO to Date         24,492,879
Fair Value - Date of Grant IPO to Date         $ 560
[1] Granted under the Company's amended 2007 Stock Incentive Plan, which was approved by the Company's stockholders at its 2018 Annual Meeting, held on April 19, 2018.
[2] Stock Incentive Plan number of granted restricted stock units related to 2017 was adjusted by 18,335 additional restricted stock units during the three months ended March 31, 2018.