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Acquisitions, Discontinued Operations and Dispositions -Collective Collateral Facilities (Details) - USD ($) $ in Millions		3 Months Ended
	Jan. 05, 2021	Dec. 31, 2020
Revolving Credit Facility | Revolving Credit Facility commitment increase
Line of Credit Facility [Line Items]
Revolving credit facility commitment increase		$ 802
Revolving Credit Facility | Revolving Credit Facility new tranche
Line of Credit Facility [Line Items]
Revolving credit facilities		273
Revolving Credit Facility | Credit default swap facility
Line of Credit Facility [Line Items]
Revolving credit facilities		150
Revolving Credit Facility | Revolving accounts receivable financing facility
Line of Credit Facility [Line Items]
Revolving credit facilities		750
Revolving Credit Facility | Repurchase facility
Line of Credit Facility [Line Items]
Revolving credit facilities		75
Revolving Credit Facility | Facility agreement in connection with sale of pre-capitalized trust securities
Line of Credit Facility [Line Items]
Revolving credit facilities		874
Revolving Credit Facility | Bilateral letter of credit facilities
Line of Credit Facility [Line Items]
Revolving credit facilities		475
Revolving Credit Facility | Total Increases to Liquidity and Collateral Facilities
Line of Credit Facility [Line Items]
Revolving credit facility commitment increase		$ 3,399
Subsequent Event | Direct Energy
Line of Credit Facility [Line Items]
Revolving credit facility commitment increase	$ 3,400

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- Definition

Net increase or decrease in the carrying amount of the debt instrument for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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+ References

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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