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Business combinations - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (JPY ¥) In Millions, unless otherwise specified	1 Months Ended
	May 24, 2011
Business Acquisition [Line Items]
Gross contractual amounts receivable	¥ 54,131
Estimate of the contractual cash flows not expected to be collected	¥ 108
Weighted-average amortization period of intangible assets	9 years

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References+ Details