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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Distributed [1] $ 85 $ 53 $ 91
Stock Incentive Plan Granted Shares Adjustment 7,034 7,034  
2007 Stock Incentive Plan (Shares)      
Beginning Balance [2] 4,974,355 5,127,915 5,472,706
Shares Granted [2] 1,077,048 1,229,177 1,374,217
Shares Cancelled [2] (55,177) (82,496) (91,443)
Shares Distributed [2] (1,220,141) (1,300,241) (1,627,565)
Ending Balance [2] 4,776,085 4,974,355 5,127,915
[1] Intrinsic value of SIP units distributed represents the compensation value reported to the participants.
[2] Stock Incentive Plan number of granted restricted stock units related to 2020 was adjusted by 7,034 restricted stock units during the year ended December 31, 2021.