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Acquisitions and Dispositions - Collective Collateral Facilities (Details) - Revolving Credit Facility - USD ($)		6 Months Ended
	Jan. 05, 2021	Jan. 05, 2021	Jul. 26, 2021	Dec. 31, 2020
Revolving Credit Facility commitment increase
Line of Credit Facility [Line Items]
Revolving Credit Facility increases	$ 802,000,000
Revolving Credit Facility new tranche
Line of Credit Facility [Line Items]
Credit facility borrowing available	273,000,000	$ 273,000,000
Facility agreement in connection with the sale of pre-capitalized trust securities
Line of Credit Facility [Line Items]
Credit facility borrowing available	$ 874,000,000	874,000,000
Credit default swap facility
Line of Credit Facility [Line Items]
Credit facility borrowing available				$ 150,000,000
Revolving accounts receivable financing facility
Line of Credit Facility [Line Items]
Credit facility borrowing available			$ 800,000,000	750,000,000
Repurchase facility
Line of Credit Facility [Line Items]
Credit facility borrowing available				75,000,000
Bilateral letter of credit facilities
Line of Credit Facility [Line Items]
Credit facility borrowing available				$ 475,000,000
Total Increases to Liquidity and Collateral Facilities
Line of Credit Facility [Line Items]
Revolving Credit Facility increases		$ 3,399,000,000

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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