Revenues from Services (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Subsidiary Revenue From Services [Line Items]
Interest On Loans	$ 19,074	$ 20,056	$ 20,810
Equipment leased to others	10,855	11,343	11,116
Fees	4,732	4,698	4,734
Investment Income	2,630	2,500	2,185
Financing leases	1,888	2,378	2,749
Premiums earned by insurance activities	1,714	1,905	2,014
Net securitization gains	0	0	0
Real estate investments	1,709	1,625	1,240
Associated companies	1,538	2,337	2,035
Other items	1,780	2,078	2,440
Revenues from services (Note 12)	45,920	48,920	49,323
Net other-than-temporary impairments on investment securities	140	387	253
Garanti Bank [Member]
Subsidiary Revenue From Services [Line Items]
Equity Interest Percentage Sold		18.60%
Gain (Loss) on Sale of Equity Investments		$ 690

Ownership percentage of an equity method investment sold by the company.

No definition available.

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- Definition

Finance subsidiary revenues from services related to financing leases.

+ References

No definition available.

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- Definition

Interest revenue generated from loans issued.

+ References

No definition available.

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- Definition

Finance subsidiary revenues from services related to investment income.

+ References

No definition available.

+ Details

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- Definition

Revenues of unconsolidated VIEs and other entities in which we do not have a controlling financial interest, but over which we have a significant influence, most often because we hold a voting interst of 20% to 50%.

+ References

No definition available.

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- Definition

Total fees and commissions earned from providing services such as leasing of space or maintaining: (1) depositor accounts; (2) transfer agent; (3) fiduciary and trust; (4) brokerage and underwriting; (5) mortgage; (6) credit cards; (7) correspondent clearing; and (8) other such services and activities performed for others.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13)

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-Publisher SEC

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-Section 04

-Paragraph 13

-Article 9

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-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 13

-Chapter V

-Subsection II

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

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- Definition

The aggregate financial services revenue and operating interest income earned during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-03.1(d))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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- Definition

The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

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-Paragraph 1

-Subparagraph (SX 210.9-04.13(h))

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- Definition

This element represents the amount of loss recognized for other than temporary impairments (OTTI) of investments in debt and equity securities.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Paragraph 1

-Subparagraph (SAB TOPIC 5.M)

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- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 19

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 1

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- Definition

Premiums recognized as revenue in the period on all types of insurance and reinsurance contracts not otherwise specified in the taxonomy after subtracting any amounts ceded to another insurer.

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-Publisher FASB

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-Subparagraph (SX 210.7-04.1)

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-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b),(c)

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- Definition

The aggregate revenue from real estate operations during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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- Definition

Fees and other service revenues recognized in the period that are not otherwise specified in the taxonomy.

+ References

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- Definition

Reflects, by transferred financial asset type, the amount of sales proceeds in excess of or deficient from the sum of the carrying amounts of transferred financial assets plus transaction costs, including those transactions in which the seller/transferor has continuing involvement with the financial assets that have been transferred.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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