Financing receivables (Tables)

12 Months Ended

Mar. 31, 2020

Financing Receivables [Abstract]

Summary of loans receivable reported within loans receivable or investments in and advances to affiliated companies

	Millions of yen
	March 31, 2019
	Carried at amortized cost		Carried at fair value(1)		Total
Loans receivable
Loans at banks	¥	565,603	¥	—	¥	565,603
Short-term secured margin loans		334,389		5,088		339,477
Inter-bank money market loans		1,699		—		1,699
Corporate loans		977,942		659,497		1,637,439
Total loans receivable	¥	1,879,633	¥	664,585	¥	2,544,218
Total	¥	1,879,633	¥	664,585	¥	2,544,218

	Millions of yen
	March 31, 2020
	Carried at amortized cost		Carried at fair value(1)		Total
Loans receivable
Loans at banks	¥	521,715	¥	—	¥	521,715
Short-term secured margin loans		296,833		8,905		305,738
Inter-bank money market loans		865		—		865
Corporate loans		1,232,851		796,236		2,029,087
Total loans receivable	¥	2,052,264	¥	805,141	¥	2,857,405
Total	¥	2,052,264	¥	805,141	¥	2,857,405

(1) Includes loans receivable and loan commitments carried at fair value through election of the fair value option.

Changes in allowance for credit losses

	Millions of yen
	Year ended March 31, 2018
	Allowance for credit losses against loans										Allowance for credit losses against receivables other than loans			Total allowance for doubtful accounts
	Loans at banks		Short-term secured margin loans		Corporate loans			Subtotal
Opening balance	¥	968	¥	—	¥	473		¥	1,441		¥	2,110		¥	3,551
Provision for credit losses		172		—		(26	)		146			24			170
Charge-offs		0		—		—			0			—			0
Other(1)		—		—		(30	)		(30	)		(177	)		(207	)
Ending balance	¥	1,140	¥	—	¥	417		¥	1,557		¥	1,957		¥	3,514

	Millions of yen
	Year ended March 31, 2019
	Allowance for credit losses against loans												Allowance for credit losses against receivables other than loans			Total allowance for doubtful accounts
	Loans at banks			Short-term secured margin loans			Corporate loans			Subtotal
Opening balance	¥	1,140		¥	—		¥	417		¥	1,557		¥	1,957		¥	3,514
Provision for credit
losses		7			364			434			805			30			835
Charge-offs		(95	)		—			(0	)		(95	)		(102	)		(197	)
Other(1)		—			6			17			23			(6	)		17
Ending balance	¥	1,052		¥	370		¥	868		¥	2,290		¥	1,879		¥	4,169
	Millions of yen
	Year ended March 31, 2020
	Allowance for credit losses against loans												Allowance for credit losses against receivables other than loans			Total allowance for doubtful accounts
	Loans at banks			Short-term secured margin loans			Corporate loans			Subtotal
Opening balance	¥	1,052		¥	370		¥	868		¥	2,290		¥	1,879		¥	4,169
Provision for credit
losses		512			—			7,125			7,637			1,451			9,088
Charge-offs		—			—			—			—			(162	)		(162	)
Other(1)		—			(18	)		(49	)		(67	)		(16	)		(83	)
Ending balance	¥	1,564		¥	352		¥	7,944		¥	9,860		¥	3,152		¥	13,012

(1) Includes the effect of foreign exchange movements.

Schedule of allowance for credit losses against loans and loans by impairment methodology and type of loans

	Millions of yen
	March 31, 2019
	Loans at banks		Short-term secured margin loans		Inter-bank money market loans		Corporate loans		Total
Allowance by impairment methodology
Evaluated individually	¥	—	¥	370	¥	—	¥	868	¥	1,238
Evaluated collectively		1,052		—		—		—		1,052
Total allowance for credit losses	¥	1,052	¥	370	¥	—	¥	868	¥	2,290
Loans by impairment methodology
Evaluated individually	¥	2,792	¥	166,148	¥	1,699	¥	976,096	¥	1,146,735
Evaluated collectively		562,811		168,241		—		1,846		732,898
Total loans	¥	565,603	¥	334,389	¥	1,699	¥	977,942	¥	1,879,633

	Millions of yen
	March 31, 2020
	Loans at banks		Short-term secured margin loans		Inter-bank money market loans		Corporate loans		Total
Allowance by impairment methodology
Evaluated individually	¥	—	¥	352	¥	—	¥	7,944	¥	8,296
Evaluated collectively		1,564		—		—		—		1,564
Total allowance for credit losses	¥	1,564	¥	352	¥	—	¥	7,944	¥	9,860
Loans by impairment methodology
Evaluated individually	¥	3,120	¥	147,364	¥	865	¥	1,232,681	¥	1,384,030
Evaluated collectively		518,595		149,469		—		170		668,234
Total loans	¥	521,715	¥	296,833	¥	865	¥	1,232,851	¥	2,052,264

Analysis of each class of loans not carried at fair value using internal ratings or equivalent credit quality indicators

	Millions of yen
	March 31, 2019
	AAA-BBB		BB-CCC		CC-D		Others(1)		Total
Secured loans at banks	¥	149,048	¥	127,309	¥	—	¥	54,545	¥	330,902
Unsecured loans at banks		233,201		1,500		—		—		234,701
Short-term secured margin loans		—		—		—		334,389		334,389
Unsecured inter-bank money market loans		1,699		—		—		—		1,699
Secured corporate loans		474,305		439,156		—		4,025		917,486
Unsecured corporate loans		16,467		311		—		43,678		60,456
Total	¥	874,720	¥	568,276	¥	—	¥	436,637	¥	1,879,633
	Millions of yen
	March 31, 2020
	AAA-BBB		BB-CCC		CC-D		Others(1)		Total
Secured loans at banks	¥	167,886	¥	169,335	¥	—	¥	52,392	¥	389,613
Unsecured loans at banks		130,649		1,453		—		—		132,102
Short-term secured margin loans		—		—		—		296,833		296,833
Unsecured inter-bank money market loans		865		—		—		—		865
Secured corporate loans		689,801		415,742		—		17,537		1,123,080
Unsecured corporate loans		6,176		18,434		—		85,161		109,771
Total	¥	995,377	¥	604,964	¥	—	¥	451,923	¥	2,052,264

(1) Relate to collateralized exposures where a specified ratio of LTV is maintained.