Fair Value Measurements (Details 1) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	$ 769	$ 985
Total derivative assets	900	1,006
Derivative assets	2,119	2,304
Netting adjustments	(1,219)	(1,298)
Accrued income and other assets	28	77
Total assets on a recurring basis at fair value	21,578	25,322
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Federal funds purchased and securities sold under repurchase agreements	369	572
Bank notes and other short-term borrowings, Short positions	450	395
Total derivative liabilities	991	1,142
Derivative liabilities	1,838	2,107
Netting adjustments	(847)	(965)
Accrued expense and other liabilities	36	66
Total liabilities on a recurring basis at fair value	1,846	2,175
Interest rate [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	1,608	1,766
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	1,181	1,335
Interest rate [Member] | Level 1 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	0	0
Interest rate [Member] | Level 2 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	1,527	1,691
Interest rate [Member] | Level 3 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	81	75
Interest rate [Member] | Level 1 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	0	0
Interest rate [Member] | Level 2 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	1,181	1,335
Interest rate [Member] | Level 3 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	0	0
Foreign exchange [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	178	180
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	319	405
Foreign exchange [Member] | Level 1 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	83	92
Foreign exchange [Member] | Level 2 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	95	88
Foreign exchange [Member] | Level 3 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	0	0
Foreign exchange [Member] | Level 1 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	78	82
Foreign exchange [Member] | Level 2 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	241	323
Foreign exchange [Member] | Level 3 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	0	0
Energy and commodity [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	295	318
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	303	335
Energy and commodity [Member] | Level 1 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	0	0
Energy and commodity [Member] | Level 2 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	295	317
Energy and commodity [Member] | Level 3 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	0	1
Energy and commodity [Member] | Level 1 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	0	0
Energy and commodity [Member] | Level 2 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	303	335
Energy and commodity [Member] | Level 3 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	0	0
Credit [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	34	39
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	31	31
Credit [Member] | Level 1 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	0	0
Credit [Member] | Level 2 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	26	27
Credit [Member] | Level 3 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	8	12
Credit [Member] | Level 1 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	0	0
Credit [Member] | Level 2 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	31	30
Credit [Member] | Level 3 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	0	1
Equity [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	4
Equity		1
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	4	1
Equity [Member] | Level 1 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	0
Equity		0
Equity [Member] | Level 2 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	4
Equity		1
Equity [Member] | Level 3 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total derivative assets	0	0
Equity [Member] | Level 1 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	0	0
Equity [Member] | Level 2 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	4	1
Equity [Member] | Level 3 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Total derivative liabilities	0	0
Principal Investments [Member] | Other Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	740	898
Principal Investments [Member] | Other Investments [Member] | Level 1 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Principal Investments [Member] | Other Investments [Member] | Level 2 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Principal Investments [Member] | Other Investments [Member] | Level 3 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	740	898
Private Equity And Mezzanine Investments [Member] | Other Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	47	50
Private Equity And Mezzanine Investments [Member] | Other Investments [Member] | Level 1 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Private Equity And Mezzanine Investments [Member] | Other Investments [Member] | Level 2 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Private Equity And Mezzanine Investments [Member] | Other Investments [Member] | Level 3 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements		50
Other Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	787	948
Other Investments [Member] | Level 1 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Other Investments [Member] | Level 1 [Member] | Principal Direct Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Other Investments [Member] | Level 1 [Member] | Principal Indirect Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Other Investments [Member] | Level 1 [Member] | Equity and Mezzanine Direct Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Other Investments [Member] | Level 1 [Member] | Equity and Mezzanine Indirect Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Other Investments [Member] | Level 2 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Other Investments [Member] | Level 2 [Member] | Principal Direct Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Other Investments [Member] | Level 2 [Member] | Principal Indirect Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Other Investments [Member] | Level 2 [Member] | Equity and Mezzanine Direct Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Other Investments [Member] | Level 2 [Member] | Equity and Mezzanine Indirect Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Other Investments [Member] | Level 3 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	787	948
Other Investments [Member] | Level 3 [Member] | Principal Direct Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements		372
Other Investments [Member] | Level 3 [Member] | Principal Indirect Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements		526
Other Investments [Member] | Level 3 [Member] | Equity and Mezzanine Direct Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements		20
Other Investments [Member] | Level 3 [Member] | Equity and Mezzanine Indirect Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements		30
Other Investments [Member] | Principal Direct Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	270	372
Other Investments [Member] | Principal Indirect Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	470	526
Other Investments [Member] | Equity and Mezzanine Direct Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	14	20
Other Investments [Member] | Equity and Mezzanine Indirect Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	33	30
Level 1 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	94	145
Total derivative assets	83	92
Derivative assets	83	92
Netting adjustments	0	0
Accrued income and other assets	7	1
Total assets on a recurring basis at fair value	193	251
Level 1 [Member] | Short-term Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Level 1 [Member] | US Treasury and Government [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	0	0
Level 1 [Member] | US Treasury and Government [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Level 1 [Member] | Mortgage Backed Securities, Other [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	0	0
Level 1 [Member] | Mortgage Backed Securities, Other [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Level 1 [Member] | Other Debt Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	94	145
Level 1 [Member] | Other Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	9	13
Level 1 [Member] | Total trading account securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	94	145
Level 1 [Member] | Commercial Loan [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	0	0
Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	0	0
Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Level 1 [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	0	0
Level 1 [Member] | Collateralized Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Level 1 [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	9	13
Level 1 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Federal funds purchased and securities sold under repurchase agreements	0	0
Bank notes and other short-term borrowings, Short positions	1	0
Total derivative liabilities	78	82
Derivative liabilities	78	82
Netting adjustments	0	0
Accrued expense and other liabilities	0	0
Total liabilities on a recurring basis at fair value	79	82
Level 2 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	674	818
Total derivative assets	1,947	2,124
Derivative assets	1,947	2,124
Netting adjustments	0	0
Accrued income and other assets	21	76
Total assets on a recurring basis at fair value	21,727	25,311
Level 2 [Member] | Short-term Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	414	373
Level 2 [Member] | US Treasury and Government [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	403	501
Level 2 [Member] | US Treasury and Government [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	9	8
Level 2 [Member] | Mortgage Backed Securities, Other [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	61	137
Level 2 [Member] | Mortgage Backed Securities, Other [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	917	1,069
Level 2 [Member] | Other Debt Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	49	69
Level 2 [Member] | Other Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	7	6
Level 2 [Member] | Total trading account securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	670	807
Level 2 [Member] | Commercial Loan [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	4	11
Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	78	66
Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	129	172
Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	79	34
Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	17,609	20,665
Level 2 [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	18,671	21,920
Level 2 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Federal funds purchased and securities sold under repurchase agreements	369	572
Bank notes and other short-term borrowings, Short positions	449	395
Total derivative liabilities	1,760	2,024
Derivative liabilities	1,760	2,024
Netting adjustments	0	0
Accrued expense and other liabilities	36	66
Total liabilities on a recurring basis at fair value	2,614	3,057
Private Equity And Mezzanine Investments [Member] | Level 3 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	47
Level 3 [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	1	22
Total derivative assets	89	88
Derivative assets	89	88
Netting adjustments	0	0
Accrued income and other assets	0	0
Total assets on a recurring basis at fair value	877	1,058
Level 3 [Member] | Short-term Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Level 3 [Member] | US Treasury and Government [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0
Total trading account assets	0	0
Level 3 [Member] | Mortgage Backed Securities, Other [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Total trading account assets	1	1
Level 3 [Member] | Other Debt Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Total trading account assets	0	21
Level 3 [Member] | Total trading account securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	1	22
Level 3 [Member] | Commercial Loan [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	0	0
Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Total trading account assets	0	0
Level 3 [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Total trading account assets	0	0
Level 3 [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	0	0
Level 3 [Member] | Principal Direct Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	270
Level 3 [Member] | Principal Indirect Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	470
Level 3 [Member] | Equity and Mezzanine Direct Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	14
Level 3 [Member] | Equity and Mezzanine Indirect Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	33
Level 3 [Member]
Fair Value Liabilities Measured on Recurring Basis, Obligations [Abstract]
Federal funds purchased and securities sold under repurchase agreements	0	0
Bank notes and other short-term borrowings, Short positions	0	0
Total derivative liabilities	0	1
Derivative liabilities	0	1
Netting adjustments	0	0
Accrued expense and other liabilities	0	0
Total liabilities on a recurring basis at fair value	0	1
Short-term Investments [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	414	373
US Treasury and Government [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	403	501
US Treasury and Government [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	9	8
Mortgage Backed Securities, Other [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	62	138
Mortgage Backed Securities, Other [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	917	1,069
Other Debt Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	143	235
Other Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	16	19
Total trading account securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	765	974
Commercial Loan [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	4	11
US States and Political Subdivisions Debt Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	78	66
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	129	172
Collateralized Mortgage Backed Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Total trading account assets	79	34
Collateralized Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	17,609	20,665
Available-for-sale Securities [Member]
Fair Value Assets Measured on Recurring Basis, Obligations [Abstract]
Securities purchased under resale agreements	$ 18,680	$ 21,933