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Acquisitions, Discontinued Operations and Dispositions - Acquisitions (Details) customer in Thousands, $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 05, 2021 USD ($) state customer province | Sep. 29, 2020 USD ($) | Aug. 01, 2019 USD ($) state customer | Jun. 01, 2018 USD ($) customer state | Dec. 31, 2020 USD ($) customer | Dec. 31, 2020 USD ($) customer | Dec. 31, 2019 USD ($) customer | Dec. 31, 2018 USD ($) customer
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of states in which the entity operates | state |  |  | 9 |  |  |  |  |
Acquisition costs |  |  |  |  |  | $ 17 |  |
Operating lease liability |  |  |  |  | $ 347 | 347 |  |
Leased Assets, Powerton facility and Units 7 and 8 of the 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] |  |  |  |  |  |  |  |
Payment for asset acquisition |  | $ 260 |  |  |  |  |  |
Direct Energy |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  | $ 2,900 |  |  |
Stream Energy |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash paid to acquire business |  |  | $ 329 |  |  |  |  |
Working capital adjustments |  |  | $ 29 |  |  |  |  |
Residential customer equivalents acquired | customer |  |  | 600 |  |  |  |  |
Customers acquired | customer |  |  | 450 |  |  |  |  |
XOOM Energy, LLC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of states in which the entity operates | state |  |  |  | 19 |  |  |  |
Purchase price |  |  |  | $ 213 |  |  |  |
Working capital adjustments |  |  |  | $ 48 |  |  |  |
Residential customer equivalents acquired | customer |  |  |  | 395 |  |  |  |
Customers acquired | customer |  |  |  | 300 |  |  |  |
Small Book Acquisitions 2020 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 22 |  |
Customers acquired | customer |  |  |  |  | 56 | 56 |  |
Small Book Acquisitions 2019 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | 17 |
Cash paid to acquire business |  |  |  |  |  |  | $ 13 |
Customers acquired | customer |  |  |  |  |  |  | 72 |
Small Book Acquisitions 2018 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  | $ 44
Cash paid to acquire business |  |  |  |  |  |  | $ 2 | $ 40
Customers acquired | customer |  |  |  |  |  |  |  | 115
Subsequent Event |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Customers added (over) | customer | 6,000 |  |  |  |  |  |  |
Subsequent Event | Direct Energy |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Customers added (over) | customer | 3,000 |  |  |  |  |  |  |
Purchase price | $ 3,625 |  |  |  |  |  |  |
Purchase price adjustment | 77 |  |  |  |  |  |  |
Cash paid to acquire business | 715 |  |  |  |  |  |  |
Proceeds from revolving Credit Facility | 166 |  |  |  |  |  |  |
Acquisition costs | $ 107 |  |  |  |  |  |  |
Subsequent Event | Direct Energy | U.S. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of states in which the entity operates | state | 50 |  |  |  |  |  |  |
Subsequent Event | Direct Energy | Canada |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Provinces in which entity operates | province | 8 |  |  |  |  |  |  |

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