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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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