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Commitments, contingencies and guarantees (Tables)

12 Months Ended

Mar. 31, 2019

Commitments, Contingencies and Guarantees [Abstract]

Commitments outstanding


		Millions of yen
		March 31
		2018				2019
Commitments to extend credit		¥	965,942			¥	2,694,368
Liquidity facilities to central clearing counterparties			249,273				1,593,439
Commitments to invest			13,273				14,413

Maturity schedule of commitments


		Millions of yen
		Total contractual amount				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		¥	2,694,368			¥	1,737,305			¥	97,933			¥	225,151			¥	633,979
Liquidity facilities to central clearing counterparties			1,593,439				1,593,439				—				—				—
Commitments to invest			14,413				865				2				362				13,184

Maturity schedule of purchase obligations


		Millions of yen
		Total				Years of payment
		Total				Less than 1 year				1 to 2 years				2 to 3 years				3 to 4 years				4 to 5 years				More than 5 years
Purchase obligations		¥	69,003			¥	21,985			¥	17,910			¥	16,400			¥	12,144			¥	564			¥	—

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


		Millions of yen
		March 31
		2018								2019
		Carrying value				Maximum potential payout / Notional total				Carrying value				Maximum potential payout / Notional total
Derivative contracts⁽¹⁾⁽²⁾		¥	4,023,893			¥	260,885,770			¥	4,315,743			¥	281,605,308
Standby letters of credit and other guarantees⁽³⁾			92				5,189				80				5,764

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

(2)	Derivative contracts primarily consist of equity, interest rate and foreign exchange contracts.

(3)	The amounts of collaterals held in connection with standby letters of credit and other guarantees as of March 31, 2018 and March 31, 2019 was ¥2,559 million and ¥2,481 million, respectively.

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
						Total				Less than 1 year				1 to 3 years				3 to 5 years				More than 5 years
Derivative contracts		¥	4,315,743			¥	281,605,308			¥	72,346,752			¥	96,669,268			¥	33,747,897			¥	78,841,391
Standby letters of credit and other guarantees			80				5,764				11				335				5,417				1