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v3.26.1

Fair Value (Nonrecurring Measurements) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025 | Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ (230,000,000) | $ (131,000,000) | $ (230,000,000) | $ (131,000,000) | $ (236,000,000) | $ (245,000,000) | $ (130,000,000) | $ (115,000,000)
Commodity Contract [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | (25,000,000) | (22,000,000) | (25,000,000) | (22,000,000) | $ (27,000,000) | $ (40,000,000) | $ 2,000,000 | $ (21,000,000)
Other Contract [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | (3,000,000) |  | (3,000,000) |  |  |  |  |
Commodity Option |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | (28,000,000) |  | (28,000,000) |  |  |  |  |
Other Credit Derivatives |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | 6,000,000 |  | 6,000,000 |  |  |  |  |
Mong Duong held-for-sale |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Long-Lived Asset, Change to Plan of Sale, Reclassification from Held-for-Sale to Held-and-Used, Impairment Loss |  | 243,000,000 |  |  |  |  |  |
Mong Duong held-for-sale | Measurement Input, Cost to Sell |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Long-Lived Asset, Change to Plan of Sale, Reclassification from Held-for-Sale to Held-and-Used, Impairment Loss | 4,000,000 |  |  |  |  |  |  |
Mong Duong Subsidiary [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Selling Expense |  |  |  | 5,000,000 |  |  |  |
Weighted Average [Member] | Commodity |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Derivative, Commodity prices |  |  | $ 51.18 |  |  |  |  |
Derivative, Underlying |  |  | 48.42 |  |  |  |  |
Maximum [Member] | Commodity |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Derivative, Commodity prices |  |  | $ 132.82 |  |  |  |  |
Derivative, Underlying |  |  | 95.62 |  |  |  |  |
Minimum [Member] | Commodity |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Derivative, Commodity prices |  |  | $ 4.21 |  |  |  |  |
Derivative, Underlying |  |  | 23.54 |  |  |  |  |
Long Lived Assets held and Used | Mong Duong held-for-sale |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  | $ 239,000,000 |  |  |  |  |
Long-Lived Asset, Change to Plan of Sale, Reclassification from Held-for-Sale to Held-and-Used, Impairment Loss | $ 239,000,000 |  |  |  |  |  |  |
Long Lived Assets Held For Sale | Mong Duong held-for-sale |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 383,000,000 |  | 383,000,000 |  |  |  |
Other Asset Impairment Charges |  |  |  | 17,000,000 |  |  |  |
Long Lived Assets Held For Sale | Mong Duong held-for-sale | Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 0 |  | 0 |  |  |  |
Long Lived Assets Held For Sale | Mong Duong held-for-sale | Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 371,000,000 |  | 371,000,000 |  |  |  |
Long Lived Assets Held For Sale | Mong Duong held-for-sale | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | $ 0 |  | $ 0 |  |  |  |

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