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Employee Incentive Plans (Share Grants And Fair Value) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended				140 Months Ended	176 Months Ended
	Mar. 31, 2022	Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2021
Employee Incentive Plans [Abstract]
Shares granted		1,083,930	[1]	1,229,177	1,374,217	25,643,893
Fair Value - Date of Grant		$ 84		$ 71	$ 65	$ 623	$ 84
Shares Granted IPO to Date							29,331,217
Fair Value - Date of Grant IPO to Date							$ 841
Stock Incentive Plan Granted Shares Adjustment	6,882
[1] Stock Incentive Plan number of granted restricted stock units related to 2021 was adjusted by 6,882 additional restricted stock units during the three months ended March 31, 2022.

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Fair Value of all shares granted under the 2007 Stock Incentive Plan from the IPO to date.

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