Pension and Severance Plans (Accumulated Benefit Obligations for All Defined Benefit Pension Plans) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2018	Mar. 31, 2017
Japan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations	¥ 1,005,557	¥ 998,501
Foreign plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations	¥ 340,353	¥ 329,989

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant