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Recently Adopted and Recently Issued Accounting Guidance - Additional Information (Detail) $ in Millions	Jan. 01, 2016 USD ($)
Accounting Changes and Error Corrections [Abstract]
Change due to recent accounting guidance	$ 51

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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