Fair Value Measurement- Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 74		$ 16
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	130	[1]	137	[1]
Other assets	15	[2]	15	[2]
Subtotal assets of consolidated investment management funds, at fair value	145		152
Level 1 | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	[1]	0	[1]
Other assets	0	[2]	0	[2]
Subtotal assets of consolidated investment management funds, at fair value	0		0
Level 2 | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	123	[1]	128	[1]
Other assets	15	[2]	15	[2]
Subtotal assets of consolidated investment management funds, at fair value	138		143
Level 3 | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	7	[1]	9	[1]
Subtotal assets of consolidated investment management funds, at fair value	$ 7		$ 9

[1] During the quarters ended March 31, 2014 and Dec. 31, 2013, the fair value of these loans decreased $1 million and $1 million, respectively, based on the fair value of the underlying collateral as allowed by ASC 310, Accounting by Creditors for Impairment of a loan, with an offset to the allowance for credit losses.

[2] Includes other assets received in satisfaction of debt and loans held for sale. Loans held for sale are carried on the balance sheet at the lower of cost or market value.