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Accounting for Derivative Instruments and Hedging Activities - Net Notional Volume Buy/Sell of Open Derivative Transactions (Details) certificate in Millions, T in Millions, MWh in Millions, MMBTU in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) MWh MMBTU certificate T | Dec. 31, 2023 USD ($) MMBTU MWh certificate T
Long | Emissions |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, mass (ton) | T | 1 | 0
Long | Renewables Energy Certificates |  |
Derivative [Line Items] |  |
Derivative, non-monetary notional amount (in shares) | certificate | 13 | 12
Long | Coal |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, mass (ton) | T | 10 | 9
Long | Power |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure in (millions of btu) and (megawatt hours) | MWh | 91 | 201
Long | Interest |  |
Derivative [Line Items] |  |
Derivative, notional amount (usd) | $ | $ 700 | $ 1,000
Long | Foreign Exchange |  |
Derivative [Line Items] |  |
Derivative, notional amount (usd) | $ | $ 410 | $ 548
Short | Natural Gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure in (millions of btu) and (megawatt hours) | MMBTU | 861 | 838
Short | Consumer Financing Program |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure in (millions of btu) and (megawatt hours) | MWh | 1,219 | 1,116

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