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Derivatives and Risk Management Activities - Interest Rate Risk Hedging (Details) $ in Millions | 6 Months Ended
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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%

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