Long-Term Borrowings - Unsecured Long-Term Borrowings by Maturity Date (Parenthetical) (Detail) $ in Millions	Mar. 31, 2017 USD ($)
Debt Disclosure [Abstract]
2018	$ 190
2019	292
2020	314
2021	551
2022	(20)
2023 and thereafter	5,600
Amount related to interest rate hedges on certain unsecured long-term borrowings	$ 6,930

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 six 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 during year six 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 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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