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Variable Interest Entities (Consolidated Variable Interest Entities) - Additional Information (Detail) - Real Estate, Credit-Related and Other Investing [Member] - USD ($)
$ in Millions
Sep. 30, 2016
Jan. 01, 2016
Dec. 31, 2015
Variable Interest Entity [Line Items]      
Assets $ 3,746   $ 3,999
Liabilities $ 1,125   $ 906
ASU No. 2015-02 [Member]      
Variable Interest Entity [Line Items]      
Assets   $ 302  
Liabilities   $ 122