Unsecured Borrowings - Unsecured Long-Term Borrowings by Maturity Date (Parenthetical) (Detail) $ in Millions	Sep. 30, 2021 USD ($)
Debt Disclosure [Abstract]
2022	$ 1
2023	132
2024	456
2025	499
2026	353
2027 and thereafter	5,770
Amount related to interest rate hedges on certain unsecured long-term borrowings	$ 7,210

Amount related to interest rate hedges on certain unsecured long-term borrowings.

No definition available.

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Amount related to interest rate hedges on certain unsecured long-term borrowings maturing after year five following the current fiscal year.

No definition available.

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Amount related to interest rate hedges on certain unsecured long-term borrowings maturing during year five following the current fiscal year.

No definition available.

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Amount related to interest rate hedges on certain unsecured long-term borrowings maturing during year four following the current fiscal year.

No definition available.

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Amount Related To Interest Rate Hedges On Certain Unsecured Long Term Borrowings Maturing In Year One

No definition available.

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Amount related to interest rate hedges on certain unsecured long-term borrowings maturing during year three following the current fiscal year.

No definition available.

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Amount related to interest rate hedges on certain unsecured long-term borrowings maturing during year two following the current fiscal year.

No definition available.

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No definition available.

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