Insurance-related accounts (Tables)

12 Months Ended

Mar. 31, 2018

Insurance [Abstract]

Policyholders' Account in Life Insurance Business

Policyholders’ account in the life insurance business is comprised of the following:

	Yen in millions
	March 31
	2017		2018
Universal life insurance		1,809,142		1,951,906
Investment contracts		686,182		738,404
Other		135,749		130,392
Total		2,631,073		2,820,702