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Retirement Benefits and Trusteed Assets (Pension Plan - Reconciliation of Obligations, Assets and Funded Status of Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Amounts recognized in Regulatory assets |  |  |
Regulatory assets | $ 6,317 | $ 4,336 |
Pension plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Accumulated benefit obligation, end of year | 4,089 | 4,078 |
Change in projected benefit obligation |  |  |
Projected/Accumulated postretirement benefit obligation, beginning of year | 4,309 | 5,857 |
Service cost | 57 | 95 | $ 108
Interest cost | 214 | 166 | 158
Actuarial (gain) loss | 74 | (1,252) |
Benefits paid | (329) | (278) |
Settlements | (7) | (279) |
Projected/Accumulated postretirement benefit obligation, end of year | 4,318 | 4,309 | 5,857
Change in plan assets |  |  |
Plan assets at fair value, beginning of year | 3,897 | 5,507 |
Actual return on plan assets | 363 | (1,062) |
Company contributions | 36 | 9 |
Benefits paid | (329) | (278) |
Settlements | (7) | (279) |
Plan assets at fair value, end of year | 3,960 | 3,897 | $ 5,507
Funded status | (358) | (412) |
Amount recorded as: |  |  |
Current liabilities | (8) | (34) |
Noncurrent liabilities | (350) | (378) |
Defined benefit plans liabilities | (358) | (412) |
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax |  |  |
Net actuarial loss | 76 | 85 |
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax | 76 | 85 |
Amounts recognized in Regulatory assets |  |  |
Net actuarial loss | 1,426 | 1,369 |
Prior service credit | (5) | (7) |
Regulatory assets | $ 1,421 | $ 1,362 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
Name: | us-gaap_RegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |