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Other Assets-Seed Capital and Private Equity Investments Valued Using Net Asset Value (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]    
Fair value $ 400 $ 361
Unfunded commitments 21 54
Seed capital and other funds
   
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]    
Fair value 318 [1] 275 [1]
Unfunded commitments 0 [1] 23 [1]
Redemption frequency Daily-quarterly [1] Monthly-yearly [1]
Investment redemption, notice period 0-180 days [1] 3-45 days [1]
Private equity funds
   
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]    
Fair value 82 [2] 86 [2]
Unfunded commitments $ 21 [2] $ 31 [2]
Minimum | Seed capital and other funds
   
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]    
Redemption notice period 0 days [1] 3 days [1]
Maximum | Seed capital and other funds
   
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]    
Redemption notice period 180 days [1] 45 days [1]
[1] Other funds include various market neutral, leveraged loans, hedge funds, real estate and structured credit funds. Redemption notice periods vary by fund.
[2] Private equity funds primarily include numerous venture capital funds that invest in various sectors of the economy. Private equity funds do not have redemption rights. Distributions from such funds will be received as the underlying investments in the funds are liquidated.