Employee benefit plans - Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets for Pension Plans with ABO and PBO in Excess of Plan Assets (Detail) (JPY ¥) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Plans with ABO in excess of plan assets:
PBO	¥ 234,399	¥ 242,490
ABO	231,321	238,614
Fair value of plan assets	191,674	159,652
Plans with PBO in excess of plan assets:
PBO	234,399	242,490
ABO	231,321	238,614
Fair value of plan assets	¥ 191,674	¥ 159,652

Employee benefit plans - Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets for Pension Plans with ABO and PBO in Excess of Plan Assets (Detail) (JPY ¥)
In Millions, unless otherwise specified

Mar. 31, 2013

Mar. 31, 2012

Plans with ABO in excess of plan assets:

PBO

¥ 234,399

¥ 242,490

ABO

231,321

238,614

Fair value of plan assets

191,674

159,652

Plans with PBO in excess of plan assets:

PBO

234,399

242,490

ABO

231,321

238,614

Fair value of plan assets

¥ 191,674

¥ 159,652

- Definition

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details

- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details

- Definition

If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details