Derivatives and Risk Management Activities - Interest Rate Risk Hedging (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025 USD ($) contract	Sep. 30, 2025 USD ($) contract	Sep. 30, 2024 USD ($)
Derivatives and Risk Management Activities
Proceeds from settlement of interest rate hedging instruments		$ (7)	$ (57)
Derivative Instruments
Derivatives and Risk Management Activities
Net gain/(loss) deferred in AOCI	$ (31)	$ (31)
8 forward starting swaps (30-year), 3.09% \| Cash Flow Hedging
Derivatives and Risk Management Activities
Term of derivative contract		30 years
Number of interest rate derivatives \| contract	8	8
Notional amount of derivatives	$ 200	$ 200
Average rate locked (percent)	3.09%	3.09%
Interest Rate Swap Terminated \| Cash Flow Hedging
Derivatives and Risk Management Activities
Derivative, notional amount terminated	$ 200	$ 200
Proceeds from settlement of interest rate hedging instruments	$ 7

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- Definition

The net cash (paid) received for terminated hedging instruments.

+ References

No definition available.

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Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Nominal or face amount used to calculate payment on derivative.

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- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

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