Employee Incentive, Retirement, Deferred Compensation, and Career Achievement Plans (Schedule of Changes in Projected Benefit Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Benefit Obligation
Projected benefit obligation at beginning of year	$ 92	$ 83
Benefit cost	16	17
Actuarial loss/(gain)	11	(8)
Projected benefit obligation at the end of year	$ 119	$ 92