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Acquisitions, Discontinued Operations and Dispositions - Acquisitions (Details) customer in Thousands, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 01, 2019 USD ($) customer state | Jun. 01, 2018 USD ($) customer state | Dec. 31, 2019 USD ($) customer | Dec. 31, 2018 USD ($) customer | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 579 | $ 573 |
Stream Energy |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of states in which the entity operates | state | 9 |  |  |  |
Purchase price | $ 329 |  |  |  |
Working capital adjustments | $ 29 |  |  |  |
Residential customer equivalents acquired | customer | 600 |  |  |  |
Customers acquired | customer | 450 |  |  |  |
Account receivable | $ 98 |  |  |  |
Accounts payable | (73) |  |  |  |
Other net current and non-current working capital | 5 |  |  |  |
Goodwill | 6 |  |  |  |
Stream Energy | Marketing Partnerships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets | 154 |  |  |  |
Stream Energy | Customer Relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets | 85 |  |  |  |
Stream Energy | Trade Names |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets | 28 |  |  |  |
Stream Energy | Other Intangible Assets |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets | $ 26 |  |  |  |
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 |  |  |
Other net current and non-current working capital |  | $ 46 |  |  |
Intangible assets |  | 133 |  |  |
Goodwill |  | $ 34 |  |  |
Small Book Acquisitions 2019 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price |  |  | $ 17 |  |
Customers acquired | customer |  |  | 72 |  |
Cash paid to acquire business |  |  | $ 13 |  | $ 2
Small Book Acquisitions 2018 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price |  |  |  | $ 44 |
Customers acquired | customer |  |  |  | 115 |
Cash paid to acquire business |  |  | $ 2 | $ 40 |

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