Fair Value Option - Aggregate Differences (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Long-term debt
Long-term debt	$ 239,539	$ 256,775
Carrying value
Loans
Nonaccrual loans	5,002	5,695
Total loans	45,775	45,312
Carrying value | Trading assets
Loans
Nonaccrual loans	4,790	4,875
All other performing loans	38,091	37,481
Carrying value | Total loans
Loans
Nonaccrual loans	212	820
All other performing loans	2,682	2,136
Carrying value | Principal Protected Debt
Long-term debt
Long-term debt	17,588	19,417
Portion at Fair Value, Fair Value Disclosure [Member]
Loans
Nonaccrual loans	1,123	1,197
Total loans	37,429	35,455
Long-term debt
Total long term debt	31,657	34,720
Long-term beneficial interests
Total long-term beneficial interests	988	1,250
Portion at Fair Value, Fair Value Disclosure [Member] | Trading assets
Loans
Nonaccrual loans	1,012	1,141
All other performing loans	33,844	32,657
Portion at Fair Value, Fair Value Disclosure [Member] | Total loans
Loans
Nonaccrual loans	111	56
All other performing loans	2,462	1,601
Portion at Fair Value, Fair Value Disclosure [Member] | Principal Protected Debt
Long-term debt
Long-term debt	17,198	19,890
Portion at Fair Value, Fair Value Disclosure [Member] | Non Principal Protected Debt
Long-term debt
Long-term debt	14,459	14,830
Long-term beneficial interests
Total long-term beneficial interests	988	1,250
Change During Period, Fair Value Disclosure [Member]
Loans
Nonaccrual loans	(3,879)	(4,498)
Total loans	(8,346)	(9,857)
Change During Period, Fair Value Disclosure [Member] | Trading assets
Loans
Nonaccrual loans	(3,778)	(3,734)
All other performing loans	(4,247)	(4,824)
Change During Period, Fair Value Disclosure [Member] | Total loans
Loans
Nonaccrual loans	(101)	(764)
All other performing loans	(220)	(535)
Change During Period, Fair Value Disclosure [Member] | Principal Protected Debt
Long-term debt
Long-term debt	$ (390)	$ 473