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Related Parties - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]        
Rent expense related to leases   $ 254 $ 242 $ 234
Scenario, Forecast [Member]        
Related Party Transaction [Line Items]        
Remaining ownership percentage intended to be acquired in Passport Research, Ltd 50.50%      
Edward Jones [Member]        
Related Party Transaction [Line Items]        
Limited partnership interest in passport research, Ltd   49.50%    
Percentage of Partnership's total revenues derived from limited partnership interest in passport research, Ltd   0.10% 0.03% 0.10%
Percentage of branch office space leased from its financial advisors   10.00%    
Rent expense related to leases   $ 27 $ 25 $ 23
Olive Street [Member]        
Related Party Transaction [Line Items]        
Expense paid to sub-advisers   30 8 1
Advisory revenue received from Trust   $ 30 $ 8 $ 1