CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
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| Operating Lease, Right-of-Use Asset | [1] | $ 411 | $ 412 | |||||
| Noncurrent operating lease obligation | [2] | 405 | 405 | |||||
| Assets | [3] | 13,983 | 13,889 | |||||
| Notes receivable from affiliated companies | 188 | 268 | ||||||
| Prepaid taxes and other | 20 | 42 | ||||||
| Public Utilities, Property, Plant and Equipment, Net | 12,765 | 12,469 | ||||||
| Goodwill | 224 | 224 | ||||||
| Other Assets, Noncurrent | 29 | 38 | ||||||
| Liabilities | [3] | 10,273 | 10,271 | |||||
| Accounts payable - Affiliated companies | 187 | 119 | ||||||
| Accrued interest | 82 | 101 | ||||||
| Accrued Income Taxes, Current | 331 | 335 | ||||||
| Other | 12 | 15 | ||||||
| Long-term debt and other long-term obligations | 6,631 | 6,629 | ||||||
| Accumulated deferred income taxes | 1,591 | 1,540 | ||||||
| Regulatory liabilities | 471 | 476 | ||||||
| Other | 8 | 9 | ||||||
| Variable Interest Entity, Primary Beneficiary | ||||||||
| Operating Lease, Right-of-Use Asset | 1 | 1 | ||||||
| Assets | 4,752 | 4,532 | ||||||
| Affiliated companies | 25 | 26 | ||||||
| Notes receivable from affiliated companies | 91 | 21 | ||||||
| Prepaid taxes and other | 1 | 3 | ||||||
| Public Utilities, Property, Plant and Equipment, Net | 4,405 | 4,249 | ||||||
| Goodwill | 224 | 224 | ||||||
| Other Assets, Noncurrent | 5 | 8 | ||||||
| Liabilities | 2,093 | 2,185 | ||||||
| Accounts payable - Affiliated companies | 100 | 78 | ||||||
| Accrued interest | 23 | 16 | ||||||
| Accrued Income Taxes, Current | 2 | 8 | ||||||
| Other | 5 | 7 | ||||||
| Long-term debt and other long-term obligations | 1,474 | 1,474 | ||||||
| Accumulated deferred income taxes | 460 | 434 | ||||||
| Regulatory liabilities | 28 | 16 | ||||||
| Other | 1 | 2 | ||||||
| Short-term borrowings- | 150 | |||||||
| Affiliated companies | ||||||||
| Operating Lease, Right-of-Use Asset | 409 | 409 | ||||||
| Noncurrent operating lease obligation | $ 403 | $ 403 | ||||||
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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of asset recognized for present right to economic benefit. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after allowance for credit loss, of accrued interest on financing receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of liability recognized for present obligation requiring transfer or otherwise providing economic benefit to others. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of long-term debt and lease obligation, classified as noncurrent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of lessee's right to use underlying asset under operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of current assets classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of noncurrent assets classified as other. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Period end amount of total net PPE. No definition available.
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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