Fair Value (Additional Fair Value Information Related To Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	$ 2,664	$ 2,513
Trading Loans	22
Loans held for sale	2,288	2,365
Other assets	697	639
Derivative Asset, Fair Value	9,833	9,463
Total Assets	70,759	66,658
Derivative Liability, Fair Value	7,696	7,606
Total liabilities	8,401	8,625
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,470	1,100
Other assets	279
Total Assets	4,203	3,127
Total liabilities	694	997
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	1,162	1,374
Trading Loans	22
Other assets	199	422
Total Assets	55,667	53,480
Total liabilities	7,377	7,320
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	32	39
Other assets	219	217
Total Assets	10,889	10,051
Total liabilities	330	308
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	4,284	4,105
Short-term assets	5,219	4,462
Trading securities	2,664	2,513
Investment securities	62,814	60,634
Trading Loans	22
Loans held for sale	2,737	2,936
Net loans (excludes leases)	170,904	148,254
Other assets	4,327	4,019
Mortgage servicing rights	996	1,115
Total Assets	263,800	237,501
Demand, savings and money market deposits	178,471	156,335
Time deposits	27,792	31,632
Borrowed funds	43,359	36,966
Unfunded loan commitments and letters of credit	220	223
Total liabilities	257,538	232,762
Carrying Amount [Member] \| Designated as Hedging Instrument [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	2,023	1,888
Derivative Liability, Fair Value	172	116
Carrying Amount [Member] \| Not Designated As Hedging Instrument [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	7,810	7,575
Derivative Liability, Fair Value	7,524	7,490
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	4,284	4,105
Short-term assets	5,219	4,462
Trading securities	2,664	2,513
Investment securities	63,365	61,018
Trading Loans	22
Loans held for sale	2,742	2,939
Net loans (excludes leases)	173,445	151,167
Other assets	4,327	4,019
Mortgage servicing rights	1,004	1,118
Total Assets	266,905	240,804
Demand, savings and money market deposits	178,471	156,335
Time deposits	28,109	31,882
Borrowed funds	44,607	39,064
Unfunded loan commitments and letters of credit	220	223
Total liabilities	259,103	235,110
Fair Value [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	4,284
Trading securities	1,470
Investment securities	2,713
Total Assets	8,486
Borrowed funds	688
Total liabilities	694
Fair Value [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term assets	5,219
Trading securities	1,162
Investment securities	53,299
Trading Loans	22
Loans held for sale	1,477
Net loans (excludes leases)	307
Other assets	2,356
Total Assets	73,509
Demand, savings and money market deposits	178,471
Time deposits	28,109
Borrowed funds	42,882
Total liabilities	256,822
Fair Value [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	32
Investment securities	7,353
Loans held for sale	1,265
Net loans (excludes leases)	173,138
Other assets	1,971
Mortgage servicing rights	1,004
Total Assets	184,910
Borrowed funds	1,037
Unfunded loan commitments and letters of credit	220
Total liabilities	1,587
Fair Value [Member] \| Designated as Hedging Instrument [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	2,023	1,888
Derivative Liability, Fair Value	172	116
Fair Value [Member] \| Designated as Hedging Instrument [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	2,023
Derivative Liability, Fair Value	172
Fair Value [Member] \| Not Designated As Hedging Instrument [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	7,810	7,575
Derivative Liability, Fair Value	7,524	7,490
Fair Value [Member] \| Not Designated As Hedging Instrument [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	19
Derivative Liability, Fair Value	6
Fair Value [Member] \| Not Designated As Hedging Instrument [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	7,644
Derivative Liability, Fair Value	7,188
Fair Value [Member] \| Not Designated As Hedging Instrument [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	147
Derivative Liability, Fair Value	$ 330

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale and Held-to-Maturity Securities which consist of all investments in certain debt and equity securities not classified as trading securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale and Held-to-maturity.

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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