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Acquisitions and Dispositions - Acquisitions (Details) $ / shares in Units, $ in Millions			3 Months Ended	12 Months Ended
	Jan. 05, 2021 USD ($) customer state province	Sep. 29, 2020 USD ($)	Mar. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 06, 2022 USD ($)
Business Acquisition [Line Items]
Operating lease liability				$ 263
Joliet facility
Business Acquisition [Line Items]
Lease expense							$ 14
Operating lease liability		$ 148
Powerton Facility And Units 7 And 8 Of The Joliet Facility
Business Acquisition [Line Items]
Purchase of assets		$ 260
Canada
Business Acquisition [Line Items]
Provinces in which entity operates | province	8
Senior Secured Term Loan | Bridge Loan facility
Business Acquisition [Line Items]
Term of facility				364 days
Revolving credit facility								$ 2,100
Vivint Smart Home Inc.
Business Acquisition [Line Items]
Acquisition costs				$ 17
Vivint Smart Home Inc. | Subsequent Event | Scenario, Forecast
Business Acquisition [Line Items]
Acquisition, share price (in usd per share) | $ / shares			$ 12
Cash paid to acquire business			$ 2,800
Vivint Smart Home Inc. | Subsequent Event | Scenario, Forecast | Revolving Credit Facility
Business Acquisition [Line Items]
Increase in existing borrowing commitments			$ 600
Direct Energy
Business Acquisition [Line Items]
Customers | customer	3,000,000
Acquisition costs					$ 25	$ 17
Purchase price	$ 3,625
Purchase price adjustment	99
Adjusted purchase price	$ 3,724
Direct Energy | U.S.
Business Acquisition [Line Items]
Number of states in which the entity operates | state	50

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