Derivatives - Additional Information (Detail) - USD ($)	9 Months Ended
Mar. 31, 2019	Jun. 30, 2018
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	263,000,000	$ 533,000,000
Gross amounts of derivative liabilities, elected to offset	122,000,000	$ 207,000,000
Estimated derivative net gains (losses) included in AOCI that will be reclassified into earnings within 12 months	$ 81,000,000
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

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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.

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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

No definition available.

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- Definition

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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