Fair Value Measurement - Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Estimated Fair Value
Assets:
Interest-bearing deposits with the Federal Reserve and other central banks	$ 96,426	$ 113,203
Interest-bearing deposits with banks	14,667	15,150
Federal funds sold and securities purchased under resale agreements	26,904	24,373
Securities held-to-maturity	42,231	43,204
Loans	59,580	61,421
Other financial assets	5,006	7,633
Subtotal assets of consolidated investment management funds, at fair value	244,814	264,984
Liabilities:
Noninterest-bearing deposits	93,005	96,277
Interest-bearing deposits	162,709	182,410
Federal funds purchased and securities sold under repurchase agreements	14,803	15,002
Payables to customers and broker-dealers	22,008	21,900
Borrowings	950	698
Long-term debt	21,881	21,494
Total liabilities	315,356	337,781
Estimated Fair Value | Level 1
Assets:
Securities held-to-maturity	11,549	11,376
Other financial assets	3,928	6,537
Subtotal assets of consolidated investment management funds, at fair value	15,477	17,913
Estimated Fair Value | Level 2
Assets:
Interest-bearing deposits with the Federal Reserve and other central banks	96,426	113,203
Interest-bearing deposits with banks	14,667	15,150
Federal funds sold and securities purchased under resale agreements	26,904	24,373
Securities held-to-maturity	30,682	31,828
Loans	59,580	61,421
Other financial assets	1,078	1,096
Subtotal assets of consolidated investment management funds, at fair value	229,337	247,071
Liabilities:
Noninterest-bearing deposits	93,005	96,277
Interest-bearing deposits	162,709	182,410
Federal funds purchased and securities sold under repurchase agreements	14,803	15,002
Payables to customers and broker-dealers	22,008	21,900
Borrowings	950	698
Long-term debt	21,881	21,494
Total liabilities	315,356	337,781
Carrying Amount
Assets:
Interest-bearing deposits with the Federal Reserve and other central banks	96,426	113,203
Interest-bearing deposits with banks	14,662	15,146
Federal funds sold and securities purchased under resale agreements	26,904	24,373
Securities held-to-maturity	41,717	43,312
Loans	59,356	61,267
Other financial assets	5,006	7,633
Subtotal assets of consolidated investment management funds, at fair value	244,071	264,934
Liabilities:
Noninterest-bearing deposits	93,005	96,277
Interest-bearing deposits	164,337	183,333
Federal funds purchased and securities sold under repurchase agreements	14,803	15,002
Payables to customers and broker-dealers	22,008	21,900
Borrowings	950	698
Long-term debt	21,314	21,188
Total liabilities	$ 316,417	$ 338,398