Fair Value Measurement-Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	$ 6,187		$ 5,721
Loans	73		53
Derivative liabilities	4,780		4,756
Fair Value, Measurements, Recurring | Sovereign debt/sovereign guaranteed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	15,243	[1]	17,284	[1]
Fair Value, Measurements, Recurring | Non-agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	920	[1]	953	[1]
Fair Value, Measurements, Recurring | Foreign covered bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,808	[1]	2,868	[1]
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Subtotal assets of consolidated investment management funds, at fair value	24,322		26,259
Percentage of assets prior to netting (percent)	19.00%		19.00%
Fair value of liabilities	475		422
Percentage of liabilities prior to netting (percent)	1.00%		1.00%
Fair Value, Measurements, Recurring | Level 1 | Securities available-for-sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	21,786		23,145
Fair Value, Measurements, Recurring | Level 1 | Securities available-for-sale | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	18,586		19,997
Fair Value, Measurements, Recurring | Level 1 | Securities available-for-sale | Sovereign debt/sovereign guaranteed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	40		40
Fair Value, Measurements, Recurring | Level 1 | Securities available-for-sale | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	92		95
Fair Value, Measurements, Recurring | Level 1 | Securities available-for-sale | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	730	[2]	763	[2]
Fair Value, Measurements, Recurring | Level 1 | Securities available-for-sale | Foreign covered bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,338		2,250
Fair Value, Measurements, Recurring | Level 1 | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	1,579	[2]	2,204	[2]
Trading assets	1,670		2,307
Fair Value, Measurements, Recurring | Level 1 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Other assets	234	[3]	250	[3]
Percentage of assets prior to netting (percent)	20.00%
Fair Value, Measurements, Recurring | Level 1 | Operations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Subtotal assets of consolidated investment management funds, at fair value	23,690		25,702
Percentage of assets prior to netting (percent)			20.00%
Fair Value, Measurements, Recurring | Level 1 | Investment Management funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	170		100
Other assets	462		457
Subtotal assets of consolidated investment management funds, at fair value	632		557
Trading liabilities			0
Other liabilities	27		1
Fair value of liabilities	27		1
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Loans	140		21
Other assets	897	[3]	745	[3]
Subtotal assets of consolidated investment management funds, at fair value	101,491		111,428
Percentage of assets prior to netting (percent)	81.00%		81.00%
Fair value of liabilities	31,447		33,267
Percentage of liabilities prior to netting (percent)	99.00%		99.00%
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	65,920		75,174
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	385		343
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | Sovereign debt/sovereign guaranteed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	15,203		17,244
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	5,128	[2]	5,236	[2]
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | Agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	25,183		32,600
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | Non-agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	920		953
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | Other RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,386		1,551
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,851		1,959
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | Agency commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	3,785		3,132
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | Asset-backed CLOs
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,258		2,130
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	3,400		3,240
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,745		1,785
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | Other debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,068		2,169
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | Foreign covered bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	470		618
Fair Value, Measurements, Recurring | Level 2 | Securities available-for-sale | Grantor Trust Residential Mortgage Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,138	[4]	2,214	[4]
Fair Value, Measurements, Recurring | Level 2 | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	2,288	[2]	2,217	[2]
Trading assets	25,703		25,912
Fair Value, Measurements, Recurring | Level 2 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Other assets	1,935		1,596
Percentage of assets prior to netting (percent)	80.00%
Fair Value, Measurements, Recurring | Level 2 | Operations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Subtotal assets of consolidated investment management funds, at fair value	93,698		102,703
Percentage of assets prior to netting (percent)			80.00%
Fair Value, Measurements, Recurring | Level 2 | Investment Management funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	7,682		8,578
Other assets	111		147
Subtotal assets of consolidated investment management funds, at fair value	7,793		8,725
Trading liabilities	6,584		7,660
Other liabilities	9		8
Fair value of liabilities	6,593		7,668
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Subtotal assets of consolidated investment management funds, at fair value	71		90
Fair value of liabilities	6		9
Percentage of liabilities prior to netting (percent)	0.00%
Fair Value, Measurements, Recurring | Level 3 | Securities available-for-sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	11		11
Fair Value, Measurements, Recurring | Level 3 | Securities available-for-sale | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	11	[2]	11	[2]
Fair Value, Measurements, Recurring | Level 3 | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments			0	[2]
Trading assets	6		9
Fair Value, Measurements, Recurring | Level 3 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Other assets	54	[3]	70	[3]
Fair Value, Measurements, Recurring | Level 3 | Operations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Subtotal assets of consolidated investment management funds, at fair value	71		90
Nondesignated | Fair Value, Measurements, Recurring | Level 1 | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	91		103
Nondesignated | Fair Value, Measurements, Recurring | Level 1 | Trading Assets | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	27		7
Nondesignated | Fair Value, Measurements, Recurring | Level 1 | Trading Assets | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	64		96
Nondesignated | Fair Value, Measurements, Recurring | Level 2 | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	23,415		23,695
Nondesignated | Fair Value, Measurements, Recurring | Level 2 | Trading Assets | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	17,024		17,137
Nondesignated | Fair Value, Measurements, Recurring | Level 2 | Trading Assets | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	6,199		6,280
Nondesignated | Fair Value, Measurements, Recurring | Level 2 | Trading Assets | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	192		278
Nondesignated | Fair Value, Measurements, Recurring | Level 3 | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	6		9
Nondesignated | Fair Value, Measurements, Recurring | Level 3 | Trading Assets | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	3		6
Nondesignated | Fair Value, Measurements, Recurring | Level 3 | Trading Assets | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets			0
Nondesignated | Fair Value, Measurements, Recurring | Level 3 | Trading Assets | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	3		3
Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 2 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	1,038		851
Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 2 | Other Assets | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	574		477
Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 2 | Other Assets | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	464		374
Parent Company | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Other liabilities			4
Total other liabilities - derivative liabilities designated as hedging	0		4
Fair value of liabilities	448		421
Percentage of liabilities prior to netting (percent)	2.00%		2.00%
Parent Company | Fair Value, Measurements, Recurring | Level 1 | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	412		367
Derivative liabilities			50
Trading liabilities	448		417
Parent Company | Fair Value, Measurements, Recurring | Level 1 | Trading Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			3
Parent Company | Fair Value, Measurements, Recurring | Level 1 | Trading Liabilities | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			47
Parent Company | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term debt	355	[2]	347	[2]
Total other liabilities - derivative liabilities designated as hedging	612		447
Fair value of liabilities	24,854		25,599
Percentage of liabilities prior to netting (percent)	98.00%		98.00%
Parent Company | Fair Value, Measurements, Recurring | Level 2 | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	235		294
Derivative liabilities			24,511
Trading liabilities	23,887		24,805
Parent Company | Fair Value, Measurements, Recurring | Level 2 | Trading Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			17,645
Parent Company | Fair Value, Measurements, Recurring | Level 2 | Trading Liabilities | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			6,367
Parent Company | Fair Value, Measurements, Recurring | Level 2 | Trading Liabilities | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			499
Parent Company | Fair Value, Measurements, Recurring | Level 2 | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			447
Parent Company | Fair Value, Measurements, Recurring | Level 2 | Other Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			385
Parent Company | Fair Value, Measurements, Recurring | Level 2 | Other Liabilities | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			62
Parent Company | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of liabilities	6		9
Percentage of liabilities prior to netting (percent)	0.00%
Parent Company | Fair Value, Measurements, Recurring | Level 3 | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			9
Trading liabilities	6		9
Parent Company | Fair Value, Measurements, Recurring | Level 3 | Trading Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			6
Parent Company | Fair Value, Measurements, Recurring | Level 3 | Trading Liabilities | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			3
Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Level 1 | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	36
Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Level 1 | Trading Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	8
Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Level 1 | Trading Liabilities | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	28
Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Level 2 | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	23,652
Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Level 2 | Trading Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	17,225
Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Level 2 | Trading Liabilities | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	6,073
Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Level 2 | Trading Liabilities | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	354
Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Level 3 | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	6
Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Level 3 | Trading Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	3
Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Level 3 | Trading Liabilities | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	3
Parent Company | Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 2 | Other Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	553
Parent Company | Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 2 | Other Liabilities | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	59
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Loans	59,906		56,749
Other assets	8,240		8,091
Subtotal assets of consolidated investment management funds, at fair value	246,292		222,252
Long-term debt	20,046		19,917
Carrying Amount | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Loans	140		21
Other assets	1,185	[3]	1,065	[3]
Subtotal assets of consolidated investment management funds, at fair value	108,010		119,430
Fair value of liabilities	14,929		15,901
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	87,717		98,330
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	18,586		19,997
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	385		343
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Sovereign debt/sovereign guaranteed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	15,243		17,284
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	5,139	[2]	5,247	[2]
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	25,183		32,600
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Non-agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	920		953
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Other RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,386		1,551
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,851		1,959
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Agency commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	3,785		3,132
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Asset-backed CLOs
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,258		2,130
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	3,400		3,240
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	92		95
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	730	[2]	763	[2]
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,745		1,785
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Other debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,068		2,169
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Foreign covered bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,808		2,868
Carrying Amount | Fair Value, Measurements, Recurring | Securities available-for-sale | Grantor Trust Residential Mortgage Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,138	[4]	2,214	[4]
Carrying Amount | Fair Value, Measurements, Recurring | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	3,867	[2]	4,421	[2]
Trading assets	9,505		9,881
Carrying Amount | Fair Value, Measurements, Recurring | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Other assets	2,223		1,916
Carrying Amount | Fair Value, Measurements, Recurring | Operations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Subtotal assets of consolidated investment management funds, at fair value	99,585		110,148
Carrying Amount | Fair Value, Measurements, Recurring | Investment Management funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	7,852		8,678
Other assets	573		604
Subtotal assets of consolidated investment management funds, at fair value	8,425		9,282
Trading liabilities	6,584		7,660
Other liabilities	36		9
Fair value of liabilities	6,620		7,669
Carrying Amount | Nondesignated | Fair Value, Measurements, Recurring | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	5,638		5,460
Carrying Amount | Nondesignated | Fair Value, Measurements, Recurring | Trading Assets | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	3,689		3,208
Carrying Amount | Nondesignated | Fair Value, Measurements, Recurring | Trading Assets | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	1,808		2,034
Carrying Amount | Nondesignated | Fair Value, Measurements, Recurring | Trading Assets | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	141		218
Carrying Amount | Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	1,038		851
Carrying Amount | Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Other Assets | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	574		477
Carrying Amount | Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Other Assets | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	464		374
Carrying Amount | Parent Company | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term debt	355	[2]	347	[2]
Total other liabilities - derivative liabilities designated as hedging	612		451
Fair value of liabilities	8,309		8,232
Carrying Amount | Parent Company | Fair Value, Measurements, Recurring | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	647		661
Derivative liabilities			6,773
Trading liabilities	7,342		7,434
Carrying Amount | Parent Company | Fair Value, Measurements, Recurring | Trading Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			3,187
Carrying Amount | Parent Company | Fair Value, Measurements, Recurring | Trading Liabilities | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			3,218
Carrying Amount | Parent Company | Fair Value, Measurements, Recurring | Trading Liabilities | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			368
Carrying Amount | Parent Company | Fair Value, Measurements, Recurring | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			447
Carrying Amount | Parent Company | Fair Value, Measurements, Recurring | Other Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			385
Carrying Amount | Parent Company | Fair Value, Measurements, Recurring | Other Liabilities | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			62
Carrying Amount | Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	6,695
Carrying Amount | Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Trading Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	3,400
Carrying Amount | Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Trading Liabilities | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	3,029
Carrying Amount | Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Trading Liabilities | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	266
Carrying Amount | Parent Company | Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Other Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	553
Carrying Amount | Parent Company | Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Other Liabilities | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	59
Netting | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Subtotal assets of consolidated investment management funds, at fair value	(17,874)	[5]	(18,347)	[5]
Fair value of liabilities	(16,999)	[5]	(17,797)	[5]
Netting | Fair Value, Measurements, Recurring | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	(17,874)	[5]	(18,347)	[5]
Netting | Fair Value, Measurements, Recurring | Operations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Subtotal assets of consolidated investment management funds, at fair value	(17,874)	[5]	(18,347)	[5]
Netting | Nondesignated | Fair Value, Measurements, Recurring | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	(17,874)	[5]	(18,347)	[5]
Netting | Nondesignated | Fair Value, Measurements, Recurring | Trading Assets | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	(13,365)	[5]	(13,942)	[5]
Netting | Nondesignated | Fair Value, Measurements, Recurring | Trading Assets | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	(4,391)	[5]	(4,246)	[5]
Netting | Nondesignated | Fair Value, Measurements, Recurring | Trading Assets | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	(118)	[5]	(159)	[5]
Netting | Parent Company | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of liabilities	(16,999)	[5]	(17,797)	[5]
Netting | Parent Company | Fair Value, Measurements, Recurring | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			(17,797)	[5]
Trading liabilities	(16,999)	[5]	(17,797)	[5]
Netting | Parent Company | Fair Value, Measurements, Recurring | Trading Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			(14,467)	[5]
Netting | Parent Company | Fair Value, Measurements, Recurring | Trading Liabilities | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			(3,149)	[5]
Netting | Parent Company | Fair Value, Measurements, Recurring | Trading Liabilities | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities			(181)	[5]
Netting | Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	(16,999)	[5]
Netting | Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Trading Liabilities | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	(13,836)	[5]
Netting | Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Trading Liabilities | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	(3,044)	[5]
Netting | Parent Company | Nondesignated | Fair Value, Measurements, Recurring | Trading Liabilities | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	$ (119)	[5]

[1] At March 31, 2015 and Dec. 31, 2014, foreign covered bonds and sovereign debt were included in Level 1 and Level 2 in the valuation hierarchy. All other assets in the table are Level 2 assets in the valuation hierarchy.

[2] Includes certain interests in securitizations.

[3] Includes private equity investments and seed capital.

[4] Previously included in the Grantor Trust. The Grantor Trust was dissolved in 2011.

[5] ASC 815 permits the netting of derivative receivables and derivative payables under legally enforceable master netting agreements and permits the netting of cash collateral. Netting is applicable to derivatives not designated as hedging instruments included in trading assets or trading liabilities, and derivatives designated as hedging instruments included in other assets or other liabilities. Netting is allocated to the derivative products based on the net fair value of each product.