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Accounting for Derivative Instruments and Hedging Activities - Net Notional Volume Buy/Sell of Open Derivative Transactions (Details) certificate in Millions, bbl in Millions, T in Millions, MWh in Millions, MMBTU in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) MWh MMBTU certificate T bbl	Dec. 31, 2022 USD ($) MWh MMBTU certificate T bbl
Long | Emissions
Derivative [Line Items]
Derivative, nonmonetary notional amount, mass (ton) | T	0	1
Long | Renewables Energy Certificates
Derivative [Line Items]
Derivative, non-monetary notional amount (in shares) | certificate	12	15
Long | Coal
Derivative [Line Items]
Derivative, nonmonetary notional amount, mass (ton) | T	9	11
Long | Oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume (in barrels) | bbl	0	1
Long | Power
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure in (millions of btu) and (megawatt hours) | MWh	201	192
Long | Interest
Derivative [Line Items]
Derivative, notional amount (usd) | $	$ 1,000	$ 0
Long | Foreign Exchange
Derivative [Line Items]
Derivative, notional amount (usd) | $	$ 548	$ 569
Short | Natural Gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure in (millions of btu) and (megawatt hours) | MMBTU	838	422
Short | Consumer Financing Program
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure in (millions of btu) and (megawatt hours) | MWh	1,116	0

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

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+ 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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-Paragraph 1A
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

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