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Retirement Plans (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Capitalization of pension and OPEB expense |  |  |  | $ 18 | $ 18 | $ 21
Pension remeasurement (loss) gain |  |  |  | (45) | 202 | 218
OPEB remeasurement gain |  |  |  | $ 35 | $ (3) | $ 248
Pension [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Discount rate (in hundredths) | 5.60% |  |  | 5.60% | 5.20% | 5.50%
Rate of return on plan assets (in hundredths) | 6.65% | 7.50% |  |  | 7.50% | 7.50%
Benefit obligation |  |  |  | $ 0 |  |
Settlement threshold |  |  |  | 173 | $ 180 | $ 175
Pension settlement costs |  |  |  |  |  | $ 55
Contributions to plans |  |  |  | 133 | $ 134 |
Remeasurement (gains) loss |  |  |  | $ 45 |  |
Percentage of decrease in pension plan |  |  |  |  |  | 20.00%
Percentage of increase in pension plan |  |  |  | 5.00% | 15.00% |
Lump sum pension payments |  |  |  | $ 108 | $ 129 |
Funded Percentage | 96.00% |  |  | 96.00% |  |
Plan assets | $ 2,328 |  |  | $ 2,328 | 2,268 | $ 2,033
Accumulated benefit obligation |  |  |  |  |  | 200
Actuarial gains (loss) |  |  |  | 5 | $ 44 | $ 867
Actuarial gain change basis points |  |  |  |  | 0.30% | 260.00%
Benefit payments |  |  |  | 187 | $ 204 |
Special termination benefits enhancements |  |  |  | 38 | 44 |
Special/contractual termination benefits |  |  |  | $ 12 |  |
Pension [Member] | Minimum [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Rate of return on plan assets (in hundredths) |  |  |  | 6.65% |  |
Pension [Member] | Maximum [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Rate of return on plan assets (in hundredths) |  |  |  | 7.50% |  |
401(K) Plan [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
401(k) savings plan employer contributions |  |  |  | $ 38 | $ 37 | $ 38
OPEB [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Discount rate (in hundredths) | 5.70% |  |  | 5.70% | 5.20% | 5.50%
Contributions to plans |  |  |  | $ 38 | $ 42 |
Remeasurement (gains) loss |  |  |  | 35 |  |
Plan assets |  |  |  |  |  |
Prior service credits deferred in accumulated comprehensive income |  |  |  |  | 45 | 40
Actuarial gains (loss) |  |  |  | $ 35 | (3) | $ 248
Annual rate of increase in the per-capita cost of covered medical benefits (in hundredths) | 6.75% |  |  | 6.75% |  |
Annual rate of increase in the per-capita cost of covered medical benefits in 2032 (in hundredths) | 4.75% |  |  | 4.75% |  |
Benefit payments |  |  |  | $ 48 | $ 53 |
OPEB [Member] | Minimum [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Discount rate (in hundredths) |  |  |  |  |  | 5.50%
Fixed Income Securities [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Target asset allocation | 65.00% |  |  | 65.00% |  |
Equity Securities [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Target asset allocation | 35.00% |  |  | 35.00% |  |
Scenario, Forecast [Member] | Pension [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Rate of return on plan assets (in hundredths) |  |  | 6.65% |  |  |

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