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Financial Information for Reportable Segments (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net Revenues:    
Asset management and administration fees $ 552 $ 484
Net interest revenue 469 434
Trading revenue 223 243
Other 56 46
Provision for loan losses (6)  
Net impairment losses on securities (4) [1] (18) [1]
Total net revenues 1,290 1,189
Expenses Excluding Interest 959 876
Income before taxes on income 331 313
Taxes on income 125 118
Net income 206 195
Investor Services
    
Net Revenues:    
Asset management and administration fees 387 341
Net interest revenue 413 384
Trading revenue 149 174
Other 42 32
Provision for loan losses (5)  
Net impairment losses on securities (4) (17)
Total net revenues 982 914
Expenses Excluding Interest 751 690
Income before taxes on income 231 224
Advisory Services
    
Net Revenues:    
Asset management and administration fees 165 142
Net interest revenue 56 50
Trading revenue 74 69
Other 14 15
Provision for loan losses (1)  
Net impairment losses on securities   (1)
Total net revenues 308 275
Expenses Excluding Interest 208 186
Income before taxes on income 100 89
Unallocated
    
Net Revenues:    
Asset management and administration fees   1
Other   $ (1)
[1] Net impairment losses on securities include total other-than-temporary impairment losses of $0 million and $2 million, net of $(4) million and $(16) million reclassified from other comprehensive income, for the three months ended March 31, 2013 and 2012, respectively.