Unsecured Borrowings - Unsecured Long-Term Borrowings by Maturity Date (Parenthetical) (Detail) $ in Millions	Mar. 31, 2020 USD ($)
Debt Disclosure [Abstract]
2021	$ 288
2022	(26)
2023	273
2024	762
2025	915
2026 and thereafter	11,550
Amount related to interest rate hedges on certain unsecured long-term borrowings	$ 13,760

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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