Financing receivables (Tables)

6 Months Ended

Sep. 30, 2018

Financing Receivables [Abstract]

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

	Millions of yen
	March 31, 2018
	Carried at amortized cost		Carried at fair value(1)		Total
Loans receivable
Loans at banks	¥	491,559	¥	—	¥	491,559
Short-term secured margin loans		429,075		—		429,075
Inter-bank money market loans		1,385		—		1,385
Corporate loans		986,347		554,137		1,540,484
Total loans receivable	¥	1,908,366	¥	554,137	¥	2,462,503
Advances to affiliated companies		—		—		—
Total	¥	1,908,366	¥	554,137	¥	2,462,503
	Millions of yen
	September 30, 2018
	Carried at amortized cost		Carried at fair value(1)		Total
Loans receivable
Loans at banks	¥	505,844	¥	—	¥	505,844
Short-term secured margin loans		335,607		5,210		340,817
Inter-bank money market loans		2,048		—		2,048
Corporate loans		862,736		596,654		1,459,390
Total loans receivable	¥	1,706,235	¥	601,864	¥	2,308,099
Advances to affiliated companies		—		—		—
Total	¥	1,706,235	¥	601,864	¥	2,308,099

(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
	Six months ended September 30, 2017
	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		Inter-bank money market loans		Corporate loans			Advances to affiliated companies		Subtotal
Opening balance	¥	968		¥	—	¥	—	¥	473		¥	0	¥	1,441		¥	2,110		¥	3,551
Provision for credit losses		101			—		—		(26	)		—		75			292			367
Charge-offs		—			—		—		—			0		0			—			0
Other(1)		—			—		—		3			—		3			(135	)		(132	)
Ending balance	¥	1,069		¥	—	¥	—	¥	450		¥	—	¥	1,519		¥	2,267		¥	3,786
	Millions of yen
	Six months ended September 30, 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		Inter-bank money market loans		Corporate loans			Advances to affiliated companies		Subtotal
Opening balance	¥	1,140		¥	—	¥	—	¥	417		¥	—	¥	1,557		¥	1,957		¥	3,514
Provision for credit losses		1			360		—		—			—		361			23			384
Charge-offs		(94	)		—		—		0			—		(94	)		118			24
Other(1)		0			12		—		28			—		40			2			42
Ending balance	¥	1,047		¥	372	¥	—	¥	445		¥	—	¥	1,864		¥	2,100		¥	3,964
	Millions of yen
	Three months ended September 30, 2017
	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		Inter-bank money market loans		Corporate loans			Advances to affiliated companies		Subtotal
Opening balance	¥	969		¥	—	¥	—	¥	447		¥	0	¥	1,416		¥	2,190		¥	3,606
Provision for credit losses		100			—		—		1			—		101			200			301
Charge-offs		—			—		—		—			0		0			—			0
Other(1)		—			—		—		2			—		2			(123	)		(121	)
Ending balance	¥	1,069		¥	—	¥	—	¥	450		¥	—	¥	1,519		¥	2,267		¥	3,786

	Millions of yen
	Three months ended September 30, 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		Inter-bank money market loans		Corporate loans		Advances to affiliated companies		Subtotal
Opening balance	¥	1,141		¥	218	¥	—	¥	434	¥	—	¥	1,793		¥	1,926	¥	3,719
Provision for credit losses		—			138		—		0		—		138			12		150
Charge-offs		(94	)		—		—		0		—		(94	)		159		65
Other(1)		0			16		—		11		—		27			3		30
Ending balance	¥	1,047		¥	372	¥	—	¥	445	¥	—	¥	1,864		¥	2,100	¥	3,964

(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, 2018
	Loans at banks		Short-term secured margin loans		Inter-bank money market loans		Corporate loans		Total
Allowance by impairment methodology
Evaluated individually	¥	—	¥	—	¥	—	¥	417	¥	417
Evaluated collectively		1,140		—		—		0		1,140
Total allowance for credit losses	¥	1,140	¥	—	¥	—	¥	417	¥	1,557
Loans by impairment methodology
Evaluated individually	¥	2,800	¥	162,017	¥	1,385	¥	978,501	¥	1,144,703
Evaluated collectively		488,759		267,058		—		7,846		763,663
Total loans	¥	491,559	¥	429,075	¥	1,385	¥	986,347	¥	1,908,366
	Millions of yen
	September 30, 2018
	Loans at banks		Short-term secured margin loans		Inter-bank money market loans		Corporate loans		Total
Allowance by impairment methodology
Evaluated individually	¥	—	¥	372	¥	—	¥	445	¥	817
Evaluated collectively		1,047		—		—		—		1,047
Total allowance for credit losses	¥	1,047	¥	372	¥	—	¥	445	¥	1,864
Loans by impairment methodology
Evaluated individually	¥	4,311	¥	154,707	¥	2,048	¥	854,291	¥	1,015,357
Evaluated collectively		501,533		180,900		—		8,445		690,878
Total loans	¥	505,844	¥	335,607	¥	2,048	¥	862,736	¥	1,706,235

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

	Millions of yen
	March 31, 2018
	AAA-BBB		BB-CCC		CC-D		Others(1)		Total
Secured loans at banks	¥	152,137	¥	106,385	¥	—	¥	46,948	¥	305,470
Unsecured loans at banks		186,089		—		—		—		186,089
Short-term secured margin loans		—		—		—		429,075		429,075
Unsecured inter-bank money market loans		1,385		—		—		—		1,385
Secured corporate loans		273,894		701,761		—		3,555		979,210
Unsecured corporate loans		—		—		—		7,137		7,137
Total	¥	613,505	¥	808,146	¥	—	¥	486,715	¥	1,908,366

	Millions of yen
	September 30, 2018
	AAA-BBB		BB-CCC		CC-D		Others(1)		Total
Secured loans at banks	¥	155,293	¥	116,569	¥	—	¥	49,043	¥	320,905
Unsecured loans at banks		182,067		—		—		2,872		184,939
Short-term secured margin loans		—		—		—		335,607		335,607
Unsecured inter-bank money market loans		2,048		—		—		—		2,048
Secured corporate loans		330,969		521,554		—		3,961		856,484
Unsecured corporate loans		—		659		—		5,593		6,252
Total	¥	670,377	¥	638,782	¥	—	¥	397,076	¥	1,706,235

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