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Acquisitions, Discontinued Operations and Dispositions - Purchase Price Allocation (Details) - USD ($) $ in Millions | Aug. 01, 2019 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 579 | $ 579
Stream Energy Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Account receivable | $ 98 |  |
Accounts payable | (73) |  |
Other net current and non-current working capital | 5 |  |
Goodwill | 6 |  |
Stream Purchase Price | 329 |  |
Stream Energy Acquisition | Texas |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 5 |  |
Stream Energy Acquisition | East |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 1 |  |
Stream Energy Acquisition | Marketing Partnerships |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | 154 |  |
Stream Energy Acquisition | Customer Relationships |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | 85 |  |
Stream Energy Acquisition | Trade Names |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | 28 |  |
Stream Energy Acquisition | Other Intangible Assets |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | $ 26 |  |

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