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Summary of Defined Benefit Pension Plans Amortized from Accumulated Other Comprehensive Income (Loss) into Net Periodic Benefit Cost over the Next Year (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Japanese Plans
Defined Benefit Plan Disclosure [Line Items]
Prior service credit	¥ (13,137)
Actuarial loss	16,708
Foreign Plans
Defined Benefit Plan Disclosure [Line Items]
Prior service credit	(130)
Actuarial loss	¥ 986

The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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- Definition

The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References+ Details