Commitments, contingencies and guarantees (Tables)

6 Months Ended

Sep. 30, 2020

Commitments, Contingencies and Guarantees [Abstract]

Commitments outstanding

	Millions of yen
	March 31, 2020		September 30, 2020
Commitments to extend credit
Liquidity facilities to central clearing counterparties	¥	1,288,774	¥	955,800
Other commitments to extend credit		958,659		971,078
Total	¥	2,247,433	¥	1,926,878
Commitments to invest	¥	15,278	¥	26,744

Maturity schedule of commitments

	Millions of yen
			Years to Maturity
	Total contractual amount		Less than 1 year		1 to 3 years		3 to 5 years		More than 5 years
Commitments to extend credit
Liquidity facilities to central clearing counterparties	¥	955,800	¥	955,800	¥	—	¥	—	¥	—
Other commitments to extend credit		971,078		121,108		156,468		207,002		486,500
Total	¥	1,926,878	¥	1,076,908	¥	156,468	¥	207,002	¥	486,500
Commitments to invest	¥	26,744	¥	1,885	¥	2,068	¥	4,878	¥	17,913

Information on derivative contracts and standby letters of credit and other guarantees

	Millions of yen
	March 31, 2020				September 30, 2020
	Carrying value		Maximum Potential Payout/ Notional Total		Carrying value		Maximum Potential Payout/ Notional Total
Derivative contracts(1)(2)	¥	7,197,647	¥	279,734,884	¥	5,736,546	¥	256,731,733
Standby letters of credit and other guarantees		—		2,351		—		14,592

(1) Credit derivatives are disclosed in Note 3. “Derivative instruments and hedging activities” and are excluded from derivative contracts.

Maturity information on derivative contracts and standby letters of credit and other guarantees

	Millions of yen
	Carrying value		Maximum Potential Payout/Notional
			Total		Years to Maturity
					Less than 1 year		1 to 3 years		3 to 5 years		More than 5 years
Derivative contracts	¥	5,736,546	¥	256,731,733	¥	62,259,465	¥	62,506,586	¥	34,342,738	¥	97,622,944
Standby letters of credit and other guarantees		—		14,592		988		12,086		109		1,409