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Recent Accounting Pronouncements Consolidations ASU 2015-02 (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Assets $ 143,623 $ 145,319    
Liabilities 136,827 136,914    
Equity 6,796 $ 8,405 $ 8,821 $ 9,305
Adjustments for New Accounting Pronouncement [Member] | Consolidated investment entities [Member]        
Assets (6,200)      
Liabilities (4,900)      
Equity $ (1,300)