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Fair Value Measurements - Fair Values of Funds and Unfunded Commitments for Funds (Detail) (Private Equity and Mezzanine Investments [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Fair Value	$ 28
Unfunded Commitments	1
Passive Funds [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Fair Value	13
Unfunded Commitments	1
Co-Managed Funds [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Fair Value	$ 15

This item represents a financial instrument (as defined) for which it is not practicable to estimate fair value. Such disclosure may be for an individual financial instrument or a class of financial instruments.

+ References+ Details

- Definition

This item represents a financial instrument (as defined) for which it is not practicable to estimate fair value. Such disclosure may be for an individual financial instrument or a class of financial instruments.

+ References+ Details