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Acquisitions and Dispositions - Acquisitions Narrative (Details) customer in Millions, $ in Millions				1 Months Ended	3 Months Ended	9 Months Ended
	Jan. 25, 2021	Jan. 05, 2021 USD ($) state customer	Sep. 29, 2020 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
Business Acquisition [Line Items]
Acquisition costs					$ 1	$ 24
Leased Assets, Powerton facility and Units 7 and 8 of the Joliet facility
Business Acquisition [Line Items]
Decrease in operating lease liability			$ 148
Powerton Facility And Units 7 And 8 Of The Joliet Facility
Business Acquisition [Line Items]
Payments to acquire assets			$ 260
Direct Energy
Business Acquisition [Line Items]
Customers added (over) | customer		3
Purchase price		$ 3,625
Purchase price adjustment		77			$ 3
Cash paid to acquire business		715
Borrowings on credit facility		166
Acquisition costs		107
Proceeds from issuance of secured and unsecured debt				$ 2,900
Increase in collective collateral facilities		$ 3,400
Direct Energy | Customer relationships
Business Acquisition [Line Items]
Intangible asset amortization period	12 years
Direct Energy | Customer and supply contracts
Business Acquisition [Line Items]
Intangible asset amortization period	14 years
Direct Energy | Trade names
Business Acquisition [Line Items]
Intangible asset amortization period	15 years
Direct Energy | U.S.
Business Acquisition [Line Items]
States in which entity operates | state		50
Direct Energy | Canada
Business Acquisition [Line Items]
Provinces in which entity operates | state		8

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