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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2026
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following table presents financial assets and liabilities measured at fair value on a recurring basis and indicates their levels within the fair value hierarchy:
| June 30, 2026 |  | December 31, 2025
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(a) | $ | 246 |  |  | $ | — |  |  | $ | — |  |  | $ | 246 |  |  | $ | 340 |  |  | $ | — |  |  | $ | — |  |  | $ | 340 |
Interest rate swaps(b) | — |  |  | 302 |  |  | — |  |  | 302 |  |  | — |  |  | 245 |  |  | — |  |  | 245 |
Natural gas supply contracts(b) | — |  |  | 1 |  |  | 90 |  |  | 91 |  |  | — |  |  | 1 |  |  | 50 |  |  | 51 |
Total | $ | 246 |  |  | $ | 303 |  |  | $ | 90 |  |  | $ | 639 |  |  | $ | 340 |  |  | $ | 246 |  |  | $ | 50 |  |  | $ | 636 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps(c) | $ | — |  |  | $ | 43 |  |  | $ | — |  |  | $ | 43 |  |  | $ | — |  |  | $ | 102 |  |  | $ | — |  |  | $ | 102 |
Natural gas supply contracts(c) | — |  |  | 3 |  |  | 192 |  |  | 195 |  |  | — |  |  | 20 |  |  | 149 |  |  | 169 |
Total | $ | — |  |  | $ | 46 |  |  | $ | 192 |  |  | $ | 238 |  |  | $ | — |  |  | $ | 122 |  |  | $ | 149 |  |  | $ | 271 |
_______________ (a)Included in cash and cash equivalents on the condensed consolidated balance sheets. (b)Included in derivative assets and noncurrent derivative assets on the condensed consolidated balance sheets. (c)Included in accrued and other liabilities and other noncurrent liabilities on the condensed consolidated balance sheets.
Schedule of Quantitative Information for the Unobservable Inputs for Level 3 Natural Gas Supply Contracts | The following table includes quantitative information for the unobservable inputs for Level 3 natural gas supply contracts as of June 30, 2026 (natural gas price amounts in dollars):
Valuation approach |  | Significant unobservable input |  | Range of significant unobservable input |  | Arithmetic average of significant unobservable input
Discounted cash flow |  | Forward natural gas price per MMBtu(a) |  | $2.07 to $5.37 |  | $ | 3.47 |
Option pricing model |  | Volatility |  | 19.2% to 66.3% |  | 28.2 | %
____________ (a) At illiquid delivery locations.
Schedule of Reconciliation of Change in Fair Value of Level 3 Derivative Instruments | The following table provides a reconciliation of changes in the net fair value of derivative instruments measured at fair value on a recurring basis using Level 3 inputs:
| Three months ended June 30,
| 2026 |  | 2025
Beginning balance as of April 1 | $ | (75) |  |  | $ | (28) |
Total realized and unrealized loss included in earnings | (65) |  |  | (131) |
Settlements | 38 |  |  | 57 |
Ending balance as of June 30 | $ | (102) |  |  | $ | (102) |
Unrealized loss included in earnings | $ | (27) |  |  | $ | (74) |
| Six months ended June 30,
| 2026 |  | 2025
Beginning balance as of January 1 | $ | (99) |  |  | $ | 6 |
Total realized and unrealized loss included in earnings | (92) |  |  | (141) |
Settlements | 100 |  |  | 33 |
Transfer into Level 3 | (11) |  |  | — |
Ending balance as of June 30 | $ | (102) |  |  | $ | (102) |
Unrealized gain (loss) included in earnings | $ | 8 |  |  | $ | (108) |
Schedule of Fair Value of Outstanding Debt Instruments | The following table presents the carrying value, fair value and fair value hierarchy of outstanding debt instruments in the condensed consolidated balance sheets:
| June 30, 2026
| Carrying value |  | Fair value
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Fixed rate debt | $ | 26,084 |  |  | $ | 23,827 |  |  | $ | 84 |  |  | $ | — |  |  | $ | 23,911 |
Variable rate debt | 16,302 |  |  | — |  |  | 16,302 |  |  | — |  |  | 16,302 |
| December 31, 2025
| Carrying value |  | Fair value
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Fixed rate debt | $ | 25,334 |  |  | $ | 25,426 |  |  | $ | 84 |  |  | $ | — |  |  | $ | 25,510 |
Variable rate debt | 9,478 |  |  | 1,078 |  |  | 8,403 |  |  | — |  |  | 9,481 |

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- Definition Tabular disclosure of financial instrument measured at fair value on recurring or nonrecurring basis. Includes, but is not limited to, instrument classified in shareholders' equity. + 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 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 + Details
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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/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 Reference 2: 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 3: 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 + Details
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- Definition Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: 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 2: 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 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 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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