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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 | 3 Months Ended | 6 Months Ended |
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Mar. 31, 2022 MWh MMBTU T bbl | Jun. 30, 2022 USD ($) MWh MMBTU certificate T bbl | Dec. 31, 2021 USD ($) certificate
Emissions |  |  |
Volumetric Underlying Derivative Transactions |  |  |
Derivative, nonmonetary notional amount, mass (ton) | 1 | 0 |
Renewable Energy Certificates |  |  |
Volumetric Underlying Derivative Transactions |  |  |
Derivative, non-monetary notional amount (in shares) | certificate |  | 11 | 13
Coal |  |  |
Volumetric Underlying Derivative Transactions |  |  |
Derivative, nonmonetary notional amount, mass (ton) | 19 | 12 |
Natural Gas |  |  |
Volumetric Underlying Derivative Transactions |  |  |
Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) | MMBTU | 813 | 832 |
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 | 185 | 179 |
Foreign Exchange |  |  |
Volumetric Underlying Derivative Transactions |  |  |
Derivative, notional amount | $ |  | $ 405 | $ 279

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