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Accounting for Derivative Instruments and Hedging Activities - Net Notional Volume Buy/Sell of Open Derivative Transactions (Details) - Long certificate in Millions, bbl in Millions, T in Millions, MWh in Millions, MMBTU in Millions, $ in Millions | 9 Months Ended | 12 Months Ended
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Sep. 30, 2024 USD ($) MMBTU MWh certificate T bbl | Dec. 31, 2023 USD ($) MWh MMBTU certificate T bbl
Emissions |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, nonmonetary notional amount, mass (ton) | T | 1 | 0
RECs |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, non-monetary notional amount (in shares) | certificate | 12 | 12
Coal |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, nonmonetary notional amount, mass (ton) | T | 11 | 9
Natural Gas |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) | MMBTU | 759 | 838
Oil |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, nonmonetary notional amount (in barrels) | bbl | 1 | 0
Power |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) | MWh | 206 | 201
Interest |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, notional amount | $ 1,700 | $ 1,000
Foreign Exchange |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, notional amount | 433 | 548
Consumer Financing Program |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, notional amount | $ 1,275 | $ 1,116

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