Derivatives and Risk Management Activities - Interest Rate Risk Hedging (Details) $ in Millions	6 Months Ended
Jun. 30, 2025 USD ($) contract
Derivative Instruments
Interest Rate Derivatives [Abstract]
Net gain/(loss) deferred in AOCI	$ (36)
8 forward starting swaps (30-year), 3.09% \| Cash Flow Hedging
Interest Rate Derivatives [Abstract]
Number of interest rate derivatives \| contract	8
Term of derivative contract	30 years
Notional amount of derivatives	$ 200
Average rate locked (percent)	3.09%
4 forward starting swaps (30-year), 0.74% \| Cash Flow Hedging
Interest Rate Derivatives [Abstract]
Number of interest rate derivatives \| contract	4
Term of derivative contract	30 years
Notional amount of derivatives	$ 100
Average rate locked (percent)	3.76%
4 Treasury Locks (10-year) 4.00% \| Cash Flow Hedging
Interest Rate Derivatives [Abstract]
Number of interest rate derivatives \| contract	4
Term of derivative contract	10 years
Notional amount of derivatives	$ 100
Average rate locked (percent)	4.00%

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

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

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Nominal or face amount used to calculate payment on derivative.

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

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

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