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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2024
Fair Value Disclosures [Abstract] |
Schedule of Carrying Value and Estimated Fair Value of Financial Instruments | The following table sets forth the carrying value and estimated fair value of the Company’s financial instruments not reported at estimated fair value on the Consolidated Balance Sheets as of December 31 (dollars in millions):
|  | 2024 |  |  | 2023 |
|  | Carrying Value |  |  | Estimated Fair Value |  |  | Carrying Value |  |  | Estimated Fair Value |
Long-term debt (Level 2) |  | $ | 1,100 |  |  | $ | 938 |  |  | $ | 1,100 |  |  | $ | 969 |
Long-term debt (Level 3) |  |  | 1,534 |  |  |  | 1,163 |  |  |  | 1,450 |  |  |  | 1,167 |
Snettisham finance lease obligation (Level 3) |  |  | 39 |  |  |  | 35 |  |  |  | 42 |  |  |  | 40 |
Long-term debt to affiliated trusts (Level 3) |  |  | 52 |  |  |  | 47 |  |  |  | 52 |  |  |  | 46 |
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis | The following table discloses by level within the fair value hierarchy the Company’s assets and liabilities measured and reported on the Consolidated Balance Sheets as of December 31, 2024 at fair value on a recurring basis (dollars in millions):
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Counterparty and Cash Collateral Netting (1) |  |  | Total |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivatives (2) |  | $ | — |  |  | $ | 23 |  |  | $ | — |  |  | $ | (13 | ) |  | $ | 10 |
Interest rate swap derivatives |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 1 |
Equity investments (3) |  |  | — |  |  |  | — |  |  |  | 53 |  |  |  | — |  |  |  | 53 |
Deferred compensation assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual Funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities (3) |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2 |
Equity securities (3) |  |  | 7 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7 |
Total |  | $ | 9 |  |  | $ | 24 |  |  | $ | 53 |  |  | $ | (13 | ) |  | $ | 73 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivatives (2) |  | $ | — |  |  | $ | 61 |  |  | $ | 3 |  |  | $ | (37 | ) |  | $ | 27 |
Total |  | $ | — |  |  | $ | 61 |  |  | $ | 3 |  |  | $ | (37 | ) |  | $ | 27 |
The following table discloses by level within the fair value hierarchy the Company’s assets and liabilities measured and reported on the Consolidated Balance Sheets as of December 31, 2023 at fair value on a recurring basis (dollars in millions):
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Counterparty and Cash Collateral Netting (1) |  |  | Total |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivatives (2) |  | $ | — |  |  | $ | 31 |  |  | $ | — |  |  | $ | (23 | ) |  | $ | 8 |
Interest rate swap derivatives |  |  | — |  |  |  | 4 |  |  |  | — |  |  |  | — |  |  |  | 4 |
Equity investments (3) |  |  | — |  |  |  | — |  |  |  | 50 |  |  |  | — |  |  |  | 50 |
Deferred compensation assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual Funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities (3) |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |
Equity securities (3) |  |  | 7 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7 |
Total |  | $ | 8 |  |  | $ | 35 |  |  | $ | 50 |  |  | $ | (23 | ) |  | $ | 70 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy commodity derivatives (2) |  | $ | — |  |  | $ | 92 |  |  | $ | 8 |  |  | $ | (65 | ) |  | $ | 35 |
Total |  | $ | — |  |  | $ | 92 |  |  | $ | 8 |  |  | $ | (65 | ) |  | $ | 35 |
(1) The Company is permitted to net derivative assets and derivative liabilities with the same counterparty when a legally enforceable master netting agreement exists. In addition, the Company nets derivative assets and derivative liabilities against payables and receivables for cash collateral held or placed with these same counterparties. (2) The Level 3 energy commodity derivative balances are associated with a natural gas exchange agreement. (3) Included in other property and investments-net and other non-current assets on the Consolidated Balance Sheets.
Schedule of Quantitative Information | The following table presents the quantitative information which was used to estimate the fair values of the Level 3 assets and liabilities above as of December 31, 2024 (dollars in millions, except mmBTU amounts):
|  | Fair Value (Net) at |  |  |  |  |  |  |
|  | December 31, 2024 |  |  | Valuation Technique |  | Unobservable Input |  | Range
Natural gas exchange |  | $ | (3 | ) |  | Internally derived weighted average cost of gas |  | Forward sales prices |  | $2.28 - $4.57/mmBTU $3.18 Weighted Average
|  |  |  |  |  |  | Sales volumes |  | 280,000 - 600,000 mmBTUs
|  | Fair Value at |  |  |  |  |  |  |
|  | December 31, 2024 |  |  | Valuation Technique |  | Unobservable Input |  | Range
Equity investments |  | $ | 53 |  |  | Market approach |  | Comparable enterprise values |  | $130-$389 $246 Average
|  |  |  |  |  |  | Time to liquidity event |  | 1.5 years
|  |  |  |  | Discounted cash flows |  | Revenue market multiples |  | 0.49 x to 6.02 x Revenue 2.11 x Average
|  |  |  |  |  |  | Market exit reduction |  | 50%
|  |  |  |  |  |  | Discount rate |  | 25%
|  |  |  |  |  |  | Annual revenues |  | $23-$153
|  |  |  |  |  |  | Terminal date |  | 2029
Schedule of Activity For Energy Commodity Derivative Assets (Liabilities) Measured At Fair Value Using Significant Unobservable Inputs (Level 3) | The following table presents activity for assets and liabilities measured at fair value using significant unobservable inputs (Level 3) for the years ended December 31 (dollars in millions):
|  | Natural Gas Exchange Agreement (1) |  |  | Equity Investments |  |  | Total |
2024: |  |  |  |  |  |  |  |  |
Balance as of January 1, 2024 |  | $ | (8 | ) |  | $ | 50 |  |  | $ | 42 |
Total gains or (losses) (realized/unrealized): |  |  |  |  |  |  |  |  |
Included in regulatory assets |  |  | 5 |  |  |  | — |  |  |  | 5 |
Purchases and debt conversions |  |  | — |  |  |  | 3 |  |  |  | 3 |
Ending balance as of December 31, 2024 |  | $ | (3 | ) |  | $ | 53 |  |  | $ | 50 |
2023: |  |  |  |  |  |  |  |  |
Balance as of January 1, 2023 |  | $ | (18 | ) |  | $ | 54 |  |  | $ | 36 |
Total gains or (losses) (realized/unrealized): |  |  |  |  |  |  |  |  |
Included in regulatory assets |  |  | 10 |  |  |  | — |  |  |  | 10 |
Recognized in net income |  |  | — |  |  |  | (4 | ) |  |  | (4 | )
Purchases and debt conversions |  |  | — |  |  |  | 3 |  |  |  | 3 |
Other |  |  | — |  |  |  | (3 | ) |  |  | (3 | )
Ending balance as of December 31, 2023 |  | $ | (8 | ) |  | $ | 50 |  |  | $ | 42 |
2022: |  |  |  |  |  |  |  |  |
Balance as of January 1, 2022 |  | $ | (8 | ) |  | $ | — |  |  | $ | (8 | )
Transfers in (2) |  |  | — |  |  |  | 21 |  |  |  | 21 |
Total gains (realized/unrealized): |  |  |  |  |  |  |  |  |
Included in regulatory assets |  |  | (5 | ) |  |  | — |  |  |  | (5 | )
Recognized in net income |  |  | — |  |  |  | 33 |  |  |  | 33 |
Settlements |  |  | (5 | ) |  |  | — |  |  |  | (5 | )
Ending balance as of December 31, 2022 |  | $ | (18 | ) |  | $ | 54 |  |  | $ | 36 |
(1) There were no purchases, issuances or transfers from other categories of derivatives instruments during the periods presented in the table above. (2) The Company elected to account for certain equity investments at recurring fair value in 2022; as such, the transfer in represents the value as of the date of the election. See further discussion within Note 7.

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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