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

Remaining Amounts of Regulatory Liabilities Not Subject to Defined Crediting Period

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Remaining Amounts of Regulatory Liabilities Subject to Crediting Period

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Remaining Recovery Period of Regulatory Liabilities Subject to Defined Crediting Period

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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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.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
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-Section 25
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-Publisher FASB
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The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

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The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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Remaining balance of regulatory assets for which no return on investment during recovery is provided. In some cases, a regulator may permit an enterprise to include a cost that would be charged to expense by an unregulated enterprise as an allowable cost over a period of time by amortizing that cost for rate-making purposes, but the regulator does not include the unrecovered amount in the rate base.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
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Remaining recovery period of regulatory assets for which no return on investment during recovery period is provided, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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