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Acquisitions, Discontinued Operations and Dispositions - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Millions | Aug. 01, 2019 | Jun. 01, 2018 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  | $ 591 | $ 573
Stream Energy Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net current and non-current working capital | $ 28 |  |  |
Other intangible assets | 283 |  |  |
Goodwill | 18 |  |  |
Purchase price | $ 329 |  |  |
XOOM Energy, LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net current and non-current working capital |  | $ 46 |  |
Other intangible assets |  | 133 |  |
Goodwill |  | 34 |  |
Purchase price |  | $ 213 |  |

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