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	3 Months Ended	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	$ 263,683		$ 273,936
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	263,683		273,936
Commercial Real Estate Portfolio Segment [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	19,733		20,946
General reserves	107		132
Total impaired loans	5,255		5,693
Allowance for losses (specific reserves)	158		188
Past Due Financing Receivables [Abstract]
Financing Receivable, Recorded Investment, Equal to Greater than 30 Days Past Due	2.20%		2.30%
Financing Receivable, Recorded Investments, Equal to Greater than 90 Days Past Due	2.00%		2.20%
Nonaccrual Financing Receivables [Abstract]
Nonaccrual loans	4,417		4,885
Amount of nonaccrual loans currently paying in accordance with contractual terms	3,997		4,461
Nonearning financing receivables	456		444
Allowance for losses as a percent of nonaccrual financing receivables	6.00%		6.60%
Allowance for losses as a percent of nonearning financing receivables	58.10%		72.10%
Impaired Loans
Total impaired loans	5,255		5,693
Allowance for losses (specific reserves)	158		188
Average investment during the period	5,474		7,525
Interest income recognized	57	90	329
Interest income recognized on a cash basis	44	68	237
Financing Receivable, Modifications, Recorded Investment	4,837		5,146
Changes In Loans Modified As Troubled Debt Restructurings	327
Loans Modified As Troubled Debt Restructuring That Have Subsequently Experienced Payment Default	174	183
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	19,733		20,946
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	14,478		15,253
Commercial Real Estate Portfolio Segment [Member] \| No Related Allowance [Member]
Financing Receivables And Allowance For Losses [Abstract]
Total impaired loans	3,186		3,491
Impaired Loans
Total impaired loans	3,186		3,491
Unpaid principal balance	3,577		3,712
Average investment during the period	3,338		3,773
Commercial Real Estate Portfolio Segment [Member] \| Related Allowance [Member]
Financing Receivables And Allowance For Losses [Abstract]
Total impaired loans	2,069		2,202
Allowance for losses (specific reserves)	158		188
Impaired Loans
Total impaired loans	2,069		2,202
Unpaid principal balance	2,462		2,807
Allowance for losses (specific reserves)	158		188
Average investment during the period	2,136		3,752
Commercial Real Estate Portfolio Segment [Member] \| Modifications Classified As TDRs In Last Twelve Months [Member]
Impaired Loans
Financing Receivable, Modifications, Recorded Investment	3,611	3,107
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	13,177		13,570
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	13,177		13,570
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	2,336		2,572
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	2,336		2,572
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	3,085		3,604
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	3,085		3,604
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied Credit Tenant [Member] \| Secured Credit Quality Indicator Low Risk [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	697		956
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	697		956
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied Credit Tenant [Member] \| Secured Credit Quality Indicator Moderate Risk [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	228		25
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	228		25
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied Credit Tenant [Member] \| Secured Credit Quality Indicator High Risk [Member]
Financing Receivables And Allowance For Losses [Abstract]
Loans and leases receivable, Gross	210		219
Credit Quality Indicators [Abstract]
Loans and leases receivable, Gross	$ 210		$ 219

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

No definition available.

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

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

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

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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

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-Publisher FASB

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-Topic 310

-SubTopic 10

-Section 50

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

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

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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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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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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.

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