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Acquisitions, Discontinued Operations and Dispositions - Acquisitions (Details) customer in Thousands |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 29, 2020 USD ($) | Jul. 24, 2020 USD ($) state customer | Aug. 01, 2019 USD ($) customer state | Nov. 05, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 22, 2020 USD ($)
Leased Assets, Powerton facility and Units 7 and 8 of the Joliet facility |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Operating lease liability | $ 148,000,000 |  |  |  |  |
Powerton Facility And Units 7 And 8 Of The Joliet Facility |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payment for asset acquisition | $ 260,000,000 |  |  |  |  |
Credit Facility | Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Increase revolving commitments |  |  |  |  | $ 802,000,000 |
Revolving credit commitments |  |  |  |  | $ 273,000,000 |
Receivables Facility | Secured Debt |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revolving credit commitments |  |  |  |  |  | $ 750,000,000
Repurchase Facility | Secured Debt |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revolving credit commitments |  |  |  |  |  | $ 75,000,000
Subsequent Event | Interest Rate Swap |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 1,600,000,000 |  |
Subsequent Event | Letter of Credit |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Increase revolving commitments |  |  |  | 87,000,000 |  |
Subsequent Event | Credit Facility | Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Increase revolving commitments |  |  |  | 802,000,000 |  |
Revolving credit commitments |  |  |  | 273,000,000 |  |
Subsequent Event | Receivables Facility | Secured Debt |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revolving credit commitments |  |  |  | 750,000,000 |  |
Subsequent Event | Repurchase Facility | Secured Debt |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revolving credit commitments |  |  |  | $ 75,000,000 |  |
Direct Energy |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Customers added (over) | customer |  | 3,000 |  |  |  |
Cash paid to acquire business |  | $ 3,625,000,000 |  |  |  |
Proceeds from issuance of long-term debt |  | 3,000,000,000 |  |  |  |
Increase in collective collateral facilities |  | $ 3,500,000,000 |  |  |  |
Direct Energy | U.S. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
States in which entity operates | state |  | 50 |  |  |  |
Direct Energy | Canada |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Provinces in which entity operates | state |  | 6 |  |  |  |
Stream Energy Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
States in which entity operates | state |  |  | 9 |  |  |
Cash paid to acquire business |  |  | $ 329,000,000 |  |  |
Working capital and other adjustment |  |  | $ 29,000,000 |  |  |
Increase in retail portfolio by RCE's acquired | customer |  |  | 600 |  |  |
Customers acquired | customer |  |  | 450 |  |  |

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