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Acquisitions, Discontinued Operations and Dispositions - Acquisitions (Details) - XOOM Energy, LLC customer in Thousands, $ in Millions | Jun. 01, 2018 USD ($) state customer
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Business Acquisition [Line Items] |
Number of states in which acquisition operates | state | 19
Purchase price | $ 219
Payments for estimated working capital included | $ 54
Increase in customers in retail portfolio | customer | 300
Purchase price allocated to accounts receivable | $ 46
Purchase price allocated to derivative assets | 42
Purchase price allocated to current and non-current assets | 26
Purchase price allocated to accounts payable | 25
Purchase price allocated to derivative liabilities | 31
Purchase price allocated to current and non-current liabilities | 18
Customer Relationships And Contracts |
Business Acquisition [Line Items] |
Purchase price allocated to finite-lived intangible assets | 169
Cash |
Business Acquisition [Line Items] |
Purchase price allocated to cash | 2
Restricted Cash |
Business Acquisition [Line Items] |
Purchase price allocated to cash | $ 8

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