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Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Recent Accounting Pronouncements        
Assets $ 139,821 $ 145,339    
Liabilities 133,529 136,960    
Total equity 6,292 $ 8,379 $ 9,279 $ 9,206
Consolidated investment entities [Member] | Adjustments for New Accounting Pronouncement [Member]        
Recent Accounting Pronouncements        
Assets (6,200)      
Liabilities (4,900)      
Total equity $ (1,300)