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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, T in Millions, MWh in Millions, MMBTU in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2024 USD ($) MWh MMBTU certificate T | Dec. 31, 2023 USD ($) MWh MMBTU certificate T
Renewable Energy Certificates |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, non-monetary notional amount (in shares) | certificate | 14 | 12
Coal |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, nonmonetary notional amount, mass (ton) | T | 7 | 9
Natural Gas |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) | MMBTU | 819 | 838
Power |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) | MWh | 201 | 201
Interest |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, notional amount | $ 1,700 | $ 1,000
Foreign Exchange |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, notional amount | 499 | 548
Consumer Financing Program |  |
Volumetric Underlying Derivative Transactions |  |
Derivative, notional amount | $ 1,088 | $ 1,116

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