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Employee Incentive Plans (Tables)
6 Months Ended
Jun. 30, 2019
Employee Incentive Plans [Abstract]  
Share Grants And Fair Value

Fair Value at

Date of Grant

Units

($ millions)

Prior periods (since inception)

22,100,001

$

449

December 31, 2016

1,451,136

55

December 31, 2017

946,489

57

December 31, 2018

1,146,267

1

62

25,643,893

$

623

(1)Stock Incentive Plan number of granted restricted stock units related to 2018 was adjusted by 640 additional restricted stock units during the six months ended June 30, 2019.

2007 Stock Incentive Plan, ROI Summary

Stock

Incentive Plan

Units

Balance, December 31, 2018

5,472,706

1

Granted

Cancelled

(8,904)

Distributed

(1,626,384)

Balance, June 30, 2019

3,837,418

(1)Stock Incentive Plan number of granted restricted stock units related to 2018 was adjusted by 640 additional restricted stock units during the six months ended June 30, 2019.