Fair Value Measurement- Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets:
Loans	$ 74	$ 16
Estimated Fair Value
Assets:
Interest-bearing deposits with the Federal Reserve and other central banks	82,602	104,359
Interest-bearing deposits with banks	42,820	35,323
Federal funds sold and securities purchased under resale agreements	12,223	9,161
Securities held-to-maturity	19,092	19,443
Loans	51,800	49,316
Other financial assets	7,138	7,601
Subtotal assets of consolidated investment management funds, at fair value	215,675	225,203
Liabilities:
Noninterest-bearing deposits	89,051	95,475
Interest-bearing deposits	162,611	165,253
Federal funds purchased and securities sold under repurchase agreements	9,935	9,648
Payables to customers and broker-dealers	16,822	15,707
Borrowings	1,479	919
Long-term debt	20,761	19,965
Total liabilities	300,659	306,967
Estimated Fair Value | Level 1
Assets:
Securities held-to-maturity	3,292	3,268
Other financial assets	6,092	6,460
Subtotal assets of consolidated investment management funds, at fair value	9,384	9,728
Estimated Fair Value | Level 2
Assets:
Interest-bearing deposits with the Federal Reserve and other central banks	82,602	104,359
Interest-bearing deposits with banks	42,820	35,323
Federal funds sold and securities purchased under resale agreements	12,223	9,161
Securities held-to-maturity	15,800	16,175
Loans	51,800	49,316
Other financial assets	1,046	1,141
Subtotal assets of consolidated investment management funds, at fair value	206,291	215,475
Liabilities:
Noninterest-bearing deposits	89,051	95,475
Interest-bearing deposits	162,611	165,253
Federal funds purchased and securities sold under repurchase agreements	9,935	9,648
Payables to customers and broker-dealers	16,822	15,707
Borrowings	1,479	919
Long-term debt	20,761	19,965
Total liabilities	300,659	306,967
Carrying Amount
Assets:
Interest-bearing deposits with the Federal Reserve and other central banks	82,602	104,359
Interest-bearing deposits with banks	42,795	35,300
Federal funds sold and securities purchased under resale agreements	12,223	9,161
Securities held-to-maturity	19,226	19,743
Loans	51,670	49,180
Other financial assets	7,138	7,601
Subtotal assets of consolidated investment management funds, at fair value	215,654	225,344
Liabilities:
Noninterest-bearing deposits	89,051	95,475
Interest-bearing deposits	163,176	165,654
Federal funds purchased and securities sold under repurchase agreements	9,935	9,648
Payables to customers and broker-dealers	16,822	15,707
Borrowings	1,479	919
Long-term debt	20,287	19,543
Total liabilities	$ 300,750	$ 306,946