Employee Benefit Plans (Schedule of Plan with PBO in Excess of Plan Assets) (Details) - Pension Plan [Member] - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 31,471	$ 37,217
Accumulated benefit obligation	30,745	36,151
Fair value of plan assets	$ 24,366	$ 27,855