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Summary of Significant Accounting Policies - Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Regulatory Assets |  |
Current regulatory assets | $ 25 | $ 26
Non-current regulatory assets | 231 | 214
Total regulatory assets(a) | 256 | 240
Amount recoverable without earning a return | $ 162 |
Weighted average remaining recovery period | 8 years |
Regulatory Liabilities |  |
Current regulatory liabilities | $ 35 | 45
Non-current regulatory liabilities | 197 | 188
Total regulatory liabilities(b) | 232 | $ 233
Amount expected to be credited to shippers over remaining weighted average period | $ 118 |
Remaining weighted average period | 11 years |
Amount not subject to defined crediting period | $ 79 |
Loss on Disposal of Assets |  |
Regulatory Assets |  |
Total regulatory assets(a) | 90 |
Income Tax Gross Up on AFUDC Equity |  |
Regulatory Assets |  |
Total regulatory assets(a) | 41 |
Other Regulatory Assets (Liabilities) |  |
Regulatory Assets |  |
Total regulatory assets(a) | $ 125 |

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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