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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
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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

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