Fair Value Option - Aggregate Differences (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Long-term debt
Long-term debt	$ 249,024	$ 256,775
Carrying value
Loans
Nonaccrual loans	4,333	5,695
Total loans	50,628	45,312
Carrying value \| Trading assets
Loans
Nonaccrual loans	4,217	4,875
All other performing loans	44,084	37,481
Carrying value \| Total loans
Loans
Nonaccrual loans	116	820
All other performing loans	2,211	2,136
Carrying value \| Principal Protected Debt
Long-term debt
Long-term debt	16,541	19,417
Portion at Fair Value, Fair Value Disclosure [Member]
Loans
Nonaccrual loans	1,024	1,197
Total loans	43,704	35,455
Long-term debt
Long-term debt	30,788	34,720
Long-term beneficial interests
Total long-term beneficial interests	1,170	1,250
Portion at Fair Value, Fair Value Disclosure [Member] \| Trading assets
Loans
Nonaccrual loans	960	1,141
All other performing loans	40,581	32,657
Portion at Fair Value, Fair Value Disclosure [Member] \| Total loans
Loans
Nonaccrual loans	64	56
All other performing loans	2,099	1,601
Portion at Fair Value, Fair Value Disclosure [Member] \| Principal Protected Debt
Long-term debt
Long-term debt	16,391	19,890
Portion at Fair Value, Fair Value Disclosure [Member] \| Non Principal Protected Debt
Long-term debt
Long-term debt	14,397	14,830
Long-term beneficial interests
Total long-term beneficial interests	1,170	1,250
Change During Period, Fair Value Disclosure [Member]
Loans
Nonaccrual loans	(3,309)	(4,498)
Total loans	(6,924)	(9,857)
Change During Period, Fair Value Disclosure [Member] \| Trading assets
Loans
Nonaccrual loans	(3,257)	(3,734)
All other performing loans	(3,503)	(4,824)
Change During Period, Fair Value Disclosure [Member] \| Total loans
Loans
Nonaccrual loans	(52)	(764)
All other performing loans	(112)	(535)
Change During Period, Fair Value Disclosure [Member] \| Principal Protected Debt
Long-term debt
Long-term debt	(150)	473
Other Guarantees and Commitments [Member]
Long-term beneficial interests
Guarantor Obligations, Maximum Exposure, Undiscounted	6,780	6,321
Guarantor Obligations, Current Carrying Value	(75)	(5)
Letters Of Credit Hedged By Derivative Transactions [Member] \| Other Guarantees and Commitments [Member]
Long-term beneficial interests
Guarantor Obligations, Maximum Exposure, Undiscounted	4,500	3,900
Guarantor Obligations, Current Carrying Value	$ (75)	$ (5)

Represents the portion of loans held as assets for which the fair value option has been elected, valued at fair value.

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Fair Value Options Other Performing Loans.

+ References

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Long Term Beneficial Interests.

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- Definition

This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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