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Pension and Other Post-Employment Benefits (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |
Average Remaining Life Expectancy of Inactive Employees in Defined Benefit Plan, In Years |  |  | 12 years
Accumulated Benefit Obligation | $ 165 | $ 169 |
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year | $ 0 |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 67.00% | 66.00% |
Long-Term Rate of Return on Plan Assets | 4.90% |  |
U.S. and Foreign Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 33.00% | 31.00% |
Operating Expense [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension and Other Postretirement (Benefit) Expense | $ 20 | $ 23 | $ 22
Administrative Expense [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension and Other Postretirement (Benefit) Expense | 5 | 5 | 5
Other Nonoperating Income (Expense) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension and Other Postretirement (Benefit) Expense | 4 | $ 4 | $ 4
Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 3.00% |
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Average Remaining Service Period Of Active Participates In Plan In Years |  |  | 10 years
Pension and Other Postretirement (Benefit) Expense | $ 24 | $ 27 | $ 27
Long-Term Rate of Return on Plan Assets | 3.95% | 4.00% | 3.85%
Actual Return on Plan Assets | $ 4 | $ 9 |
OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Average Remaining Service Period Of Active Participates In Plan In Years |  |  | 4 years
Pension and Other Postretirement (Benefit) Expense | $ (3) | $ (3) | $ (4)
Long-Term Rate of Return on Plan Assets | 0.00% | 0.00% | 0.00%
Actual Return on Plan Assets | $ 0 | $ 0 |

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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 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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 Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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