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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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