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Derivative Instruments and Hedging Activities - Volumetric Underlying Derivative Transactions (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($) MMBTU MWh	Dec. 31, 2021 USD ($) MMBTU MWh
Natural Gas | Long
Derivatives, Fair Value [Line Items]
Derivative nonmonetary notional amount (energy measure) | MMBTU	0	2
Power | Short
Derivatives, Fair Value [Line Items]
Derivative nonmonetary notional amount (energy measure) | MWh	19	17
Interest | Long
Derivatives, Fair Value [Line Items]
Derivative, notional amount | $	$ 1,200	$ 1,326

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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- Definition

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