Supplemental Information About The Credit Quality Of Financing Receivables And Allowance For Losses On Financing Receivables (Real Estate) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	$ 277,003		$ 295,037
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	277,003		295,037
Commercial Real Estate Portfolio Segment [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	26,294		32,749
General reserves	178		267
Total impaired loans	7,477		8,747
Allowance for losses (specific reserves)	558		822
Past Due Financing Receivables [Abstract]
Financing Receivable, Recorded Investment, Equal to Greater than 30 Days Past Due	2.80%		2.80%
Financing Receivable, Recorded Investments, Equal to Greater than 90 Days Past Due	2.80%		2.50%
Nonaccrual Financing Receivables [Abstract]
Nonaccrual loans	5,633		6,949
Amount of nonaccrual loans currently paying in accordance with contractual terms	4,911		6,061
Nonearning financing receivables	682		790
Allowance for losses as a percent of nonaccrual financing receivables	13.10%		15.70%
Allowance for losses as a percent of nonearning financing receivables	107.90%		137.80%
Impaired Loans
Total impaired loans	7,477		8,747
Allowance for losses (specific reserves)	558		822
Average investment during the period	7,982		9,678
Interest income recognized	265	309	399
Interest income recognized on a cash basis	183	272	339
Financing Receivable, Modifications, Recorded Investment	6,510		7,006
Changes In Loans Modified As Troubled Debt Restructurings	3,619
Loans Modified As Troubled Debt Restructuring That Have Subsequently Experienced Payment Default	212
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	26,294		32,749
Loan To Value Ratio Of Real Estate Loans Paying In Accordance With Contractual Terms	95.00%
Commercial Real Estate Portfolio Segment [Member] \| Performing Financing Receivable [Member]
Financing Receivables And Allowance For Losses [Abstract]
Non-impaired financing receivables	18,817		24,002
Commercial Real Estate Portfolio Segment [Member] \| No Related Allowance [Member]
Financing Receivables And Allowance For Losses [Abstract]
Total impaired loans	3,882		3,790
Impaired Loans
Total impaired loans	3,882		3,790
Unpaid principal balance	4,128		3,846
Average investment during the period	3,843		3,783
Commercial Real Estate Portfolio Segment [Member] \| Related Allowance [Member]
Financing Receivables And Allowance For Losses [Abstract]
Total impaired loans	3,595		4,957
Allowance for losses (specific reserves)	558		822
Impaired Loans
Total impaired loans	3,595		4,957
Unpaid principal balance	3,889		5,049
Allowance for losses (specific reserves)	558		822
Average investment during the period	4,139		5,895
Commercial Real Estate Portfolio Segment [Member] \| Modifications Classified As TDRs In Last Twelve Months [Member]
Impaired Loans
Financing Receivable, Modifications, Recorded Investment	4,606
Commercial Real Estate Portfolio Segment [Member] \| Debt Real Estate [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	21,225		24,501
Past Due Financing Receivables [Abstract]
Financing Receivable, Recorded Investment, Equal to Greater than 30 Days Past Due	2.40%		2.40%
Financing Receivable, Recorded Investments, Equal to Greater than 90 Days Past Due	2.30%		2.30%
Nonaccrual Financing Receivables [Abstract]
Nonaccrual loans	5,141		6,351
Nonearning financing receivables	454		541
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	21,225		24,501
Commercial Real Estate Portfolio Segment [Member] \| Debt Real Estate [Member] \| Loan To Value Ratio Less Than 80 Percent [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	14,092		14,454
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	14,092		14,454
Commercial Real Estate Portfolio Segment [Member] \| Debt Real Estate [Member] \| Loan To Value Ratio From 80 To 95 Percent [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	3,215		4,593
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	3,215		4,593
Commercial Real Estate Portfolio Segment [Member] \| Debt Real Estate [Member] \| Loan To Value Ratio Greater Than 95 Percent [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	3,918		5,454
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	3,918		5,454
Commercial Real Estate Portfolio Segment [Member] \| Debt Real Estate [Member] \| No Related Allowance [Member]
Financing Receivables And Allowance For Losses [Abstract]
Total impaired loans	3,684		3,558
Impaired Loans
Total impaired loans	3,684		3,558
Unpaid principal balance	3,930		3,614
Average investment during the period	3,645		3,568
Commercial Real Estate Portfolio Segment [Member] \| Debt Real Estate [Member] \| Related Allowance [Member]
Financing Receivables And Allowance For Losses [Abstract]
Total impaired loans	3,312		4,560
Allowance for losses (specific reserves)	472		717
Impaired Loans
Total impaired loans	3,312		4,560
Unpaid principal balance	3,606		4,652
Allowance for losses (specific reserves)	472		717
Average investment during the period	3,798		5,435
Commercial Real Estate Portfolio Segment [Member] \| Business Properties Real Estate [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	5,069		8,248
Past Due Financing Receivables [Abstract]
Financing Receivable, Recorded Investment, Equal to Greater than 30 Days Past Due	4.70%		3.90%
Financing Receivable, Recorded Investments, Equal to Greater than 90 Days Past Due	4.50%		3.00%
Nonaccrual Financing Receivables [Abstract]
Nonaccrual loans	492		598
Nonearning financing receivables	228		249
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	5,069		8,248
Commercial Real Estate Portfolio Segment [Member] \| Business Properties Real Estate [Member] \| Secured Credit Quality Indicator Low Risk [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	4,610		7,628
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	4,610		7,628
Commercial Real Estate Portfolio Segment [Member] \| Business Properties Real Estate [Member] \| Secured Credit Quality Indicator Moderate Risk [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	64		110
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	64		110
Commercial Real Estate Portfolio Segment [Member] \| Business Properties Real Estate [Member] \| Secured Credit Quality Indicator High Risk [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	395		510
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	395		510
Commercial Real Estate Portfolio Segment [Member] \| Business Properties Real Estate [Member] \| No Related Allowance [Member]
Financing Receivables And Allowance For Losses [Abstract]
Total impaired loans	198		232
Impaired Loans
Total impaired loans	198		232
Unpaid principal balance	198		232
Average investment during the period	198		215
Commercial Real Estate Portfolio Segment [Member] \| Business Properties Real Estate [Member] \| Related Allowance [Member]
Financing Receivables And Allowance For Losses [Abstract]
Total impaired loans	283		397
Allowance for losses (specific reserves)	86		105
Impaired Loans
Total impaired loans	283		397
Unpaid principal balance	283		397
Allowance for losses (specific reserves)	86		105
Average investment during the period	$ 341		$ 460

The amount of losses established as a percentage nonaccrual financing receivables.

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- Definition

The amount of losses established as a percentage nonearning financing receivables.

+ References

No definition available.

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- Definition

The amount of financing receivables that are categorized as non accrual that are currently paying in accordance with the contractual terms.

+ References

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- Definition

Loans that were modified as troubled debt restructurings during the period.

+ References

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- Definition

Financing receivables that are equal to or greater than 30 days past due.

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- Definition

Financing receivables that are 90 days or more past due, or for which collection is otherwise doubtful.

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Financing receivables that are equal to or greater than 90 days past due.

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Reflects the amount of interest income on impaired and nonperforming loans that was recognized as income during the reporting period.

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- Definition

Financing receivable amounts that are not impaired at the end of the period.

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No definition available.

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- Definition

Loans that were modified by troubled debt restructurings that experienced a payment default after being classified as a troubled debt restructuring.

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- Definition

The loan to value rations of the real estate debt financing receivables that are paying in accordance with contractual terms.

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 40

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of allowance for credit losses related to recorded investment.

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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph e

-Chapter V

-Subsection I

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-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 116

-IssueDate 2006-05-01

-Chapter 8

-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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