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Fair Value (Tables) | 6 Months Ended
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Jun. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Recurring Fair Value Measurements | The classifications of recurring fair value measurements within the fair value hierarchy were:
|  | June 30, 2025 |  | December 31, 2024
|  | Level 1 |  | Level 2 |  |  |  | NAV |  | Netting (a) |  | Total |  | Level 1 |  | Level 2 |  |  |  | NAV |  | Netting (a) |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | — |  |  | $ | — |  |  |  |  | $ | 14 |  |  | $ | — |  |  | $ | 14 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 3 |  |  | $ | — |  |  | $ | 3 |
Equity securities (b) |  | 786 |  | — |  |  |  |  | 360 |  |  | — |  |  | 1,146 |  |  | 758 |  |  | — |  |  |  |  | 347 |  |  | — |  |  | 1,105 |
U.S. government debt securities |  | 330 |  | — |  |  |  |  | — |  |  | — |  |  | 330 |  |  | 353 |  |  | — |  |  |  |  | — |  |  | — |  |  | 353 |
Municipal debt securities |  | — |  |  | 96 |  |  |  |  | — |  |  | — |  |  | 96 |  |  | — |  |  | 85 |  |  |  |  | — |  |  | — |  |  | 85 |
Corporate debt securities |  | — |  |  | 191 |  |  |  |  | — |  |  | — |  |  | 191 |  |  | — |  |  | 173 |  |  |  |  | — |  |  | — |  |  | 173 |
Receivables (payables), net (c) |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  | 13 |  |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  | 5 |
NDT funds |  | 1,116 |  |  | 287 |  |  |  |  | 374 |  |  | — |  |  | 1,790 |  |  | 1111 |  |  | 258 |  |  |  |  | 350 |  |  | — |  |  | 1,724 |
Commodity derivatives |  | 360 |  |  | 107 |  |  |  |  | — |  |  | (389) |  |  | 78 |  |  | 134 |  |  | 91 |  |  |  |  | — |  |  | (156) |  |  | 69 |
Interest rate derivatives |  | — |  |  | 2 |  |  |  |  | — |  |  | — |  |  | 2 |  |  | — |  |  | 2 |  |  |  |  | — |  |  | — |  |  | 2 |
Total assets |  | $ | 1,476 |  |  | $ | 396 |  |  |  |  | $ | 374 |  |  | $ | (389) |  |  | $ | 1,870 |  |  | $ | 1,245 |  |  | $ | 351 |  |  |  |  | $ | 350 |  |  | $ | (156) |  |  | $ | 1,795 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivatives |  | $ | 429 |  |  | $ | 110 |  |  |  |  | $ | — |  |  | $ | (458) |  |  | $ | 81 |  |  | $ | 145 |  |  | $ | 29 |  |  |  |  | $ | — |  |  | $ | (167) |  |  | $ | 7 |
Interest rate derivatives |  | — |  |  | 13 |  |  |  |  | — |  |  | — |  |  | 13 |  |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  | — |
Total liabilities |  | $ | 429 |  |  | $ | 123 |  |  |  |  | $ | — |  |  | $ | (458) |  |  | $ | 94 |  |  | $ | 145 |  |  | $ | 29 |  |  |  |  | $ | — |  |  | $ | (167) |  |  | $ | 7 |
__________________ (a)Amounts represent netting pursuant to master netting arrangements and cash collateral held or placed with the same counterparty. (b)Includes fixed income funds and real estate investment trusts. (c)Represents: (i) interest and dividends earned but not received; and (ii) net sold or purchased investments, but not settled.
Schedule of Carrying Value and Fair Value of Indebtedness | The carrying value and fair value of indebtedness presented on the Consolidated Balance Sheets were:
|  | June 30, 2025 |  | December 31, 2024
|  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Revolving credit facilities |  | $ | 70 |  |  | $ | 70 |  |  | $ | — |  |  | $ | — |
Long-term debt (a) |  | 2,989 |  |  | 3,113 |  |  | 3,004 |  |  | 3,120 |
__________________ (a)Aggregate value of “Long-term debt” and “Long-term debt, due within one year” presented on the Consolidated Balance Sheets.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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