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Interest rate benchmark reform (Detail) $ in Millions | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($)
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Disclosure Of Maximum Exposure Of Financial Instruments To Interest Rate Benchmark Reform [Line Items] |  |  |
Total off-balance sheet irrevocable loan commitments |  | $ 16,000 | $ 15,000
LIBOR benchmark rate CHF | Interest rate benchmark reform |  |  |
Disclosure Of Maximum Exposure Of Financial Instruments To Interest Rate Benchmark Reform [Line Items] |  |  |
Total carrying value of non-derivative financial assets | [1],[2] | 31,423 | 36,046
Total carrying value of non-derivative financial liabilities | [1] | $ 2,029 | $ 2,612
Trade count of derivative financial instruments | [1],[3] | 9,519 | 9,749
Total off-balance sheet irrevocable loan commitments | [1],[4] | $ 1 | $ 106
LIBOR benchmark rate USD | Interest rate benchmark reform |  |  |
Disclosure Of Maximum Exposure Of Financial Instruments To Interest Rate Benchmark Reform [Line Items] |  |  |
Total carrying value of non-derivative financial assets | [1],[2] | 77,502 | 72,185
Total carrying value of non-derivative financial liabilities | [1] | $ 9,834 | $ 13,142
Trade count of derivative financial instruments | [1],[3] | 42,566 | 40,080
Total off-balance sheet irrevocable loan commitments | [1],[4] | $ 4,433 | $ 4,656
LIBOR benchmark rate GBP | Interest rate benchmark reform |  |  |
Disclosure Of Maximum Exposure Of Financial Instruments To Interest Rate Benchmark Reform [Line Items] |  |  |
Total carrying value of non-derivative financial assets | [1],[2] | 1,829 | 5,399
Total carrying value of non-derivative financial liabilities | [1] | $ 566 | $ 1,429
Trade count of derivative financial instruments | [1],[3] | 12,513 | 13,006
Total off-balance sheet irrevocable loan commitments | [1],[4] | $ 0 | $ 167
LIBOR benchmark rate EUR | Interest rate benchmark reform |  |  |
Disclosure Of Maximum Exposure Of Financial Instruments To Interest Rate Benchmark Reform [Line Items] |  |  |
Total carrying value of non-derivative financial assets | [1],[2],[5] | 6,587 | 8,253
Total carrying value of non-derivative financial liabilities | [1],[5] | $ 1,919 | $ 2,252
Trade count of derivative financial instruments | [1],[3],[5] | 9,626 | 9,613
Total off-balance sheet irrevocable loan commitments | [1],[4],[5] | $ 0 | $ 0
LIBOR benchmark rate JPY | Interest rate benchmark reform |  |  |
Disclosure Of Maximum Exposure Of Financial Instruments To Interest Rate Benchmark Reform [Line Items] |  |  |
Total carrying value of non-derivative financial assets | [1],[2] | 3,070 | 3,060
Total carrying value of non-derivative financial liabilities | [1] | $ 1,060 | $ 1,460
Trade count of derivative financial instruments | [1],[3] | 4,247 | 3,961
Total off-balance sheet irrevocable loan commitments | [1],[4] | $ 0 | $ 0
LIBOR benchmark rate XCCY | Interest rate benchmark reform |  |  |
Disclosure Of Maximum Exposure Of Financial Instruments To Interest Rate Benchmark Reform [Line Items] |  |  |
Total carrying value of non-derivative financial assets | [1],[2] | 3,796 | 4,469
Total carrying value of non-derivative financial liabilities | [1] | $ 0 | $ 0
Trade count of derivative financial instruments | [1],[3] | 5,948 | 5,206
Total off-balance sheet irrevocable loan commitments | [1],[4] | $ 15,767 | $ 15,188
[1] | <div>Contracts have been disclosed without regard to early termination rights. Instead, it is assumed that such contracts will transition away from IBORs without such rights being exercised</div>
[2] | <div>Includes loans related to revolving multi-currency credit lines.</div>
[3] | <div>Includes cross-currency swaps where either leg or both legs are indexed to an IBOR.</div>
[4] | <div>Includes loan commitments that can be drawn in different currencies at the client‘s discretion.</div>
[5] | <div>Includes primarily EUR LIBOR positions.</div>

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