Fair Value Option - Aggregate Differences (Details 1) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Long-term debt
Long-term debt	$ 255,831	$ 256,775
Carrying value
Loans
Nonaccrual loans	5,466	5,695
Total loans	44,085	45,312
Carrying value | Trading assets
Loans
Nonaccrual loans	4,691	4,875
All other performing loans	36,303	37,481
Carrying value | Total loans
Loans
Nonaccrual loans	775	820
All other performing loans	2,316	2,136
Carrying value | Principal Protected Debt
Long-term debt
Long-term debt	19,127	19,417
Long-term beneficial interests
Total long-term beneficial interests	0	0
Portion at Fair Value, Fair Value Disclosure [Member]
Loans
Nonaccrual loans	1,063	1,197
Total loans	34,373	35,455
Long-term debt
Total long term debt	35,473	34,720
Long-term beneficial interests
Total long-term beneficial interests	1,001	1,250
Portion at Fair Value, Fair Value Disclosure [Member] | Trading assets
Loans
Nonaccrual loans	1,008	1,141
All other performing loans	31,497	32,657
Portion at Fair Value, Fair Value Disclosure [Member] | Total loans
Loans
Nonaccrual loans	55	56
All other performing loans	1,813	1,601
Portion at Fair Value, Fair Value Disclosure [Member] | Principal Protected Debt
Long-term debt
Long-term debt	19,131	19,890
Long-term beneficial interests
Total long-term beneficial interests	0	0
Portion at Fair Value, Fair Value Disclosure [Member] | Non Principal Protected Debt
Long-term debt
Long-term debt	16,342	14,830
Long-term beneficial interests
Total long-term beneficial interests	1,001	1,250
Change During Period, Fair Value Disclosure [Member]
Loans
Nonaccrual loans	(4,403)	(4,498)
Total loans	(9,712)	(9,857)
Change During Period, Fair Value Disclosure [Member] | Trading assets
Loans
Nonaccrual loans	(3,683)	(3,734)
All other performing loans	(4,806)	(4,824)
Change During Period, Fair Value Disclosure [Member] | Total loans
Loans
Nonaccrual loans	(720)	(764)
All other performing loans	(503)	(535)
Change During Period, Fair Value Disclosure [Member] | Principal Protected Debt
Long-term debt
Long-term debt	4	473
Long-term beneficial interests
Total long-term beneficial interests	$ 0	$ 0