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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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