Employee Benefit Plans (Schedule of Plan with ABO 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	$ 28,960	$ 37,215
Accumulated benefit obligation	28,494	36,150
Fair value of plan assets	$ 22,002	$ 27,854