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Commodity and Other Derivative Contractual Assets and Liabilities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) gal in Millions, certificate in Millions, T in Millions, MMBTU in Millions, $ in Millions	Dec. 31, 2023 USD ($) GWh certificate T MMBTU gal	Dec. 31, 2022 USD ($) MMBTU GWh certificate gal T
Natural gas
Derivatives, Fair Value [Line Items]
Notional Volume | MMBTU	5,335	6,007
Electricity
Derivatives, Fair Value [Line Items]
Notional Volume | GWh	800,001	754,762
Financial transmission rights
Derivatives, Fair Value [Line Items]
Notional Volume | GWh	250,895	225,845
Coal
Derivatives, Fair Value [Line Items]
Notional Volume | T	35	48
Fuel oil
Derivatives, Fair Value [Line Items]
Notional Volume | gal	3	105
Emissions
Derivatives, Fair Value [Line Items]
Notional Volume | T	24	40
Renewable energy certificates
Derivatives, Fair Value [Line Items]
Notional Volume | certificate	29	31
Interest rate swaps, variable/fixed
Derivatives, Fair Value [Line Items]
Notional Amount | $	$ 5,225	$ 6,720
Interest rate swaps, fixed/variable
Derivatives, Fair Value [Line Items]
Notional Amount | $	$ 1,300	$ 2,120

X

- Definition

Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
-Paragraph 1A
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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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