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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
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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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.

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