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Fair Value - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Gross Asset |  | $ 15 | $ 24 |
Liability |  | 58 | 64 |
Fair Value, Recurring [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Assets, Fair Value Disclosure |  | 61 | 73 |
Financial Liabilities Fair Value Disclosure |  | 33 | 27 |
Counterparty and Cash Collateral Netting, Assets | [1] | (12) | (13) |
Counterparty and Cash Collateral Netting, Liabilities | [1] | (25) | (37) |
Fair Value, Recurring [Member] | Fixed Income Funds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Deferred compensation assets: | [2] | 3 | 2 |
Fair Value, Recurring [Member] | Equity Funds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Equity investments |  | 49 | 53 |
Deferred compensation assets: | [2] | 6 | 7 |
Fair Value, Recurring [Member] | Energy Commodity Derivatives [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Counterparty and Cash Collateral Netting, Assets | [1] | (12) | (13) | [3]
Derivative Asset |  | 2 | 10 | [3]
Counterparty and Cash Collateral Netting, Liabilities | [1],[3] | (25) | (37) |
Derivative Liability | [3] | 33 | 27 |
Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Derivative Asset |  | 1 | 1 |
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Assets, Fair Value Disclosure |  | 9 | 9 |
Fair Value, Recurring [Member] | Level 1 [Member] | Fixed Income Funds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Deferred compensation assets: | [2] | 3 | 2 |
Fair Value, Recurring [Member] | Level 1 [Member] | Equity Funds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Deferred compensation assets: | [2] | 6 | 7 |
Fair Value, Recurring [Member] | Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Assets, Fair Value Disclosure |  | 15 | 24 |
Financial Liabilities Fair Value Disclosure |  | 43 | 61 |
Fair Value, Recurring [Member] | Level 2 [Member] | Energy Commodity Derivatives [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Gross Asset |  | 14 | 23 | [3]
Liability | [3] | 43 | 61 |
Fair Value, Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Gross Asset |  | 1 | 1 |
Fair Value, Recurring [Member] | Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Equity investments |  | 49 |  |
Assets, Fair Value Disclosure |  | 49 | 53 |
Financial Liabilities Fair Value Disclosure |  | 15 | 3 |
Fair Value, Recurring [Member] | Level 3 [Member] | Equity Funds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Equity investments |  | 49 | 53 |
Fair Value, Recurring [Member] | Level 3 [Member] | Energy Commodity Derivatives [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Liability | [3] | $ 15 | $ 3 |
[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 any payables and receivables for cash collateral held or placed with these same counterparties.
[2] | Included in other property and investments-net and other non-current assets on the Condensed Consolidated Balance Sheets.
[3] | The Level 3 energy commodity derivative balances are associated with a natural gas exchange agreement.

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