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Consideration of Credit Risk and Concentrations (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) Counterparty | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Counterparty | Sep. 30, 2024 USD ($)
Impact of Derivative Activity [Abstract] |  |  |  |  |
Fair value hedges |  | $ 0 | $ 0 | $ 0 | $ 0
Other Derivative Instruments |  |  |  |  |
Impact of Derivative Activity [Abstract] |  |  |  |  |
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss |  | 0 | 0 | 0 | 0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities |  | 5 | (6) | 26 | 38
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) |  | (1) | (13) | (22) | (16)
Pre-tax gains (losses) recognized during the period in income |  | 2 | 3 | (18) | (33)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  | 0 | 0 | 0 | 0
Other Derivative Instruments | Electric Commodity |  |  |  |  |
Impact of Derivative Activity [Abstract] |  |  |  |  |
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss |  | 0 |  | 0 | 0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities |  | 13 |  | 27 | 41
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) | [1] | (1) | (13) | (22) | (16)
Pre-tax gains (losses) recognized during the period in income |  | 0 | 0 | 0 | 0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  | 0 | 0 | 0 | 0
Other Derivative Instruments | Natural Gas Commodity |  |  |  |  |
Impact of Derivative Activity [Abstract] |  |  |  |  |
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss |  | 0 | 0 | 0 | 0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities |  | (8) | (6) | (1) | (3)
Other Derivative Instruments | Commodity Trading |  |  |  |  |
Impact of Derivative Activity [Abstract] |  |  |  |  |
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) |  | 0 | 0 | 0 | 0
Pre-tax gains (losses) recognized during the period in income | [2] | 2 | 3 | (5) | (19)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  | 0 | 0 | 0 | 0
Other Derivative Instruments | Natural Gas Commodity |  |  |  |  |
Impact of Derivative Activity [Abstract] |  |  |  |  |
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) |  |  |  | 0 | 0
Pre-tax gains (losses) recognized during the period in income | [3],[4] |  |  | (13) | (14)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  |  | 0 | 0
Designated as Hedging Instrument | Cash Flow Hedges |  |  |  |  |
Impact of Derivative Activity [Abstract] |  |  |  |  |
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss |  |  |  | 1 | 29
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities |  |  |  | 0 | 0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) |  | 0 | 0 | 0 | 0
Pre-tax gains (losses) recognized during the period in income |  | 0 | 0 | 0 | 0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  | (1) | (1) | (3) | (3)
Designated as Hedging Instrument | Cash Flow Hedges | Interest Rate |  |  |  |  |
Impact of Derivative Activity [Abstract] |  |  |  |  |
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss |  |  |  | 1 | 29
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities |  |  |  | 0 | 0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) |  | 0 | 0 | 0 | 0
Pre-tax gains (losses) recognized during the period in income |  | 0 | 0 | 0 | 0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | [5] | $ (1) | $ (1) | $ (3) | $ (3)
Credit Concentration Risk |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty |  | 10 |  | 10 |
Credit Concentration Risk | Municipal or Cooperative Entities or Other Utilities [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty |  | 7 |  | 7 |
Credit Concentration Risk | External Credit Rating, Investment Grade [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty |  | 2 |  | 2 |
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties |  | $ 21 |  | $ 21 |
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) |  | 12.00% |  | 12.00% |
Credit Concentration Risk | Internal Investment Grade [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty |  | 7 |  | 7 |
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties |  | $ 85 |  | $ 85 |
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) |  | 51.00% |  | 51.00% |
Credit Concentration Risk | External Credit Rating, Non Investment Grade [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty |  | 1 |  | 1 |
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties |  | $ 28 |  | $ 28 |
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) |  | 17.00% |  | 17.00% |
[1] | Recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate. FTR settlements are shared with customers and do not have a material impact on net income. Presented amounts reflect changes in fair value between auction and settlement dates, but exclude the original auction fair value.
[2] | Recorded to electric revenues. Presented amounts do not reflect non-derivative transactions or margin sharing with customers.
[3] | Other than $2 million of 2025 and 2024 losses recorded to electric fuel and purchased power, amounts are recorded to cost of natural gas sold and transported. Amounts are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.
[4] | Relates primarily to option premium amortization.
[5] | Recorded to interest charges.

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