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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Employee Incentive Plans [Abstract] |  |  |  |  |
Beginning Balance |  | 4,756,761 | 4,783,810 |  | 4,974,355
Shares Granted |  | 1,256,870 | 1,428,994 | [1] | 1,084,773
Shares Canceled |  | (20,480) | (179,856) |  | (55,177)
Shares Distributed |  | (1,389,032) | (1,276,186) |  | (1,220,141)
Ending Balance |  | 4,604,119 | 4,756,761 |  | 4,783,810
Distributed | [2] | $ 108 | $ 67 |  | $ 85
Stock Incentive Plan Granted Shares Adjustment |  | 3,722 | 3,722 |  |
[1] | Stock Incentive Plan number of granted restricted stock units related to 2022 was adjusted by 3,722 additional restricted stock units during the year ended December 31, 2023.
[2] | Intrinsic value of SIP units distributed represents the compensation value reported to the participants.

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