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Acquisitions, Discontinued Operations and Dispositions - Purchase Price Allocation (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Jan. 05, 2021 | Dec. 31, 2020 | Aug. 01, 2019
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Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 1,795 |  | $ 579 |
Texas |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | 751 | $ 427 | 324 |
East |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 853 | $ 648 | $ 240 |
Stream Energy |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Account receivable |  |  |  | $ 98
Accounts payable |  |  |  | (73)
Other net current and non-current working capital |  |  |  | 5
Goodwill |  |  |  | 6
Purchase Price |  |  |  | 329
Stream Energy | Texas |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  |  | 5
Stream Energy | East |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  |  | 1
Stream Energy | Marketing Partnerships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  |  |  | 154
Stream Energy | Customer Relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  |  |  | 85
Stream Energy | Trade Names |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  |  |  | 28
Stream Energy | Other Intangible Assets |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  |  |  | $ 26

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