Derivatives - Additional Information (Detail) - USD ($)	3 Months Ended
Sep. 30, 2023	Jun. 30, 2023
Derivative [Line Items]
Minimum required liquidity under certain counterparty agreements	$ 1,000,000,000
Minimum liquidity for the period as defined by certain counterparty agreements	1,000,000,000
Gross amounts of derivative assets, elected to offset	627,000,000	$ 442,000,000
Gross amounts of derivative liabilities, elected to offset	$ 772,000,000	$ 804,000,000
Senior Unsecured Obligations
Derivative [Line Items]
Debt instrument credit rating	AAA

The minimum liquidity for the period as required by certain of our counterparty agreements for derivative instruments.

No definition available.

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- Definition

The minimum liquidity required by certain of our counterparty agreements for derivative instruments.

+ References

No definition available.

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- Definition

Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
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-Subparagraph (SX 210.5-02(22))
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-Publisher FASB
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-Paragraph 3
-Publisher FASB
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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 22
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481326/860-20-50-4D

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
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-Section 50
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