Employee Benefit Plans (Paid Benefit Obligations and Accumulated Benefit Obligations in Excess of Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accumulated benefit obligation [Abstract]
Projected benefit obligations	$ 1,434	$ 1,831
Accumulated benefit obligations	1,384	1,740
Estimated fair value of plan assets	0	0
Defined Benefit Plan, Plan with Accumulated Postretirement Benefit Obligation in Excess of Plan Assets, Accumulated Postretirement Benefit Obligation	562	813
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]
Projected benefit obligations	1,444	1,840
Accumulated benefit obligations	1,384	1,740
Estimated fair value of plan assets	10	9
Defined Benefit Plan, Plan with Accumulated Postretirement Benefit Obligation in Excess of Plan Assets, Plan Assets	$ 276	$ 331