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Retirement Benefits (Funded Status Of Benefit Plans And Amounts Included In Regulatory Assets And OCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Change in plan assets: |  |  |
Funded status – deficiency (surplus) | $ (551) | $ (377) |
Accrued benefit cost (asset) at December 31 | (551) | (377) |
Amounts recognized in the balance sheet consist of: |  |  |
Noncurrent asset | (581) | (411) |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation at end of year | 4,102 | 3,911 |
Change in benefit obligation: |  |  |
Net benefit obligation at beginning of year | 4,061 | 5,457 |
Service cost | 79 | 128 | $ 134
Interest cost | 221 | 163 | 152
Participant contributions | 0 | 0 |
Actuarial (gain) loss | 170 | (1,425) |
Benefits paid | (273) | (262) |
Net benefit obligation at end of year | 4,258 | 4,061 | 5,457
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 4,027 | 5,745 |
Actual return on plan assets | 514 | (1,461) |
Employer contributions | 4 | 5 | 60
Participant contributions | 0 | 0 |
Benefits paid | (273) | (262) |
Fair value of plan assets at end of year | 4,272 | 4,027 | 5,745
Funded status – deficiency (surplus) | (14) | 34 |
Accrued benefit cost (asset) at December 31 | (14) | 34 |
Amounts recognized in the balance sheet consist of: |  |  |
Noncurrent asset | (44) | 0 |
Liability, Defined Benefit Plan, Current | 2 | 3 |
Liability, Defined Benefit Plan, Noncurrent | 28 | 31 |
Amounts recognized in regulatory assets or liabilities consist of: |  |  |
Net actuarial gain | (10) | (107) |
Prior service credit | 0 | 0 |
Amounts recognized in accumulated OCI (pretax) consist of: |  |  |
Net actuarial (gain) loss | 22 | 15 |
Total | 12 | (92) |
Postretirement Benefits |  |  |
Change in benefit obligation: |  |  |
Net benefit obligation at beginning of year | 838 | 1,129 |
Service cost | 12 | 20 | 23
Interest cost | 45 | 34 | 33
Participant contributions | 7 | 8 |
Actuarial (gain) loss | 17 | (289) |
Benefits paid | (63) | (64) |
Net benefit obligation at end of year | 856 | 838 | 1,129
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 1,249 | 1,558 |
Actual return on plan assets | 197 | (255) |
Employer contributions | 3 | 2 | 2
Participant contributions | 7 | 8 |
Benefits paid | (63) | (64) |
Fair value of plan assets at end of year | 1,393 | 1,249 | $ 1,558
Funded status – deficiency (surplus) | (537) | (411) |
Accrued benefit cost (asset) at December 31 | (537) | (411) |
Amounts recognized in the balance sheet consist of: |  |  |
Noncurrent asset | (537) | (411) |
Liability, Defined Benefit Plan, Current | 0 | 0 |
Liability, Defined Benefit Plan, Noncurrent | 0 | 0 |
Amounts recognized in regulatory assets or liabilities consist of: |  |  |
Net actuarial gain | (311) | (268) |
Prior service credit | (25) | (29) |
Amounts recognized in accumulated OCI (pretax) consist of: |  |  |
Net actuarial (gain) loss | (4) | (4) |
Total | $ (340) | $ (301) |

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- Definition The pretax total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income and regulatory assets associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References No definition available. + Details
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- Definition The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and are currently recorded as a regulatory asset. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References No definition available. + Details
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