Derivative Financial Instruments (Derivative Classifications and Hedging Relationships) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Derivative Asset, Fair Value	$ 940	[1]	$ 933	[1]
Derivative Financial Instruments, Notional Values	58,060		65,386
Derivative Liability, Fair Value	(969)	[1]	(1,002)	[1]
Interest Rate Contract [Member] | Mortgage Servicing Rights [Member] | Not Designated as Hedging Instrument [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	16,196		19,698
Derivative Asset, Fair Value	244	[1]	225	[1]
Derivative Liability, Fair Value	(63)	[1]	(103)	[1]
Interest Rate Contract [Member] | Mortgage Servicing Rights [Member] | Not Designated as Hedging Instrument [Member] | Receive Fixed Swaps [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	3,088		3,225
Derivative Asset, Fair Value	34	[1]	13	[1]
Derivative Liability, Fair Value	(17)	[1]	(61)	[1]
Interest Rate Contract [Member] | Mortgage Servicing Rights [Member] | Not Designated as Hedging Instrument [Member] | Pay Fixed Swaps [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	2,889		2,536
Derivative Asset, Fair Value	9	[1]	15	[1]
Derivative Liability, Fair Value	(37)	[1]	(7)	[1]
Interest Rate Contract [Member] | Mortgage Servicing Rights [Member] | Not Designated as Hedging Instrument [Member] | When Issued Securities and Forward Rate Agreements and Forward Commitments [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	2,362		3,582
Derivative Asset, Fair Value	9	[1]	5	[1]
Derivative Liability, Fair Value			(14)	[1]
Interest Rate Contract [Member] | Mortgage Servicing Rights [Member] | Not Designated as Hedging Instrument [Member] | Option Trades [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	6,515		6,095
Derivative Asset, Fair Value	192	[1]	192	[1]
Derivative Liability, Fair Value	(8)	[1]	(11)	[1]
Interest Rate Contract [Member] | Mortgage Servicing Rights [Member] | Not Designated as Hedging Instrument [Member] | Futures Contracts [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	1,342		4,260
Derivative Liability, Fair Value	(1)	[1]	(10)	[1]
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Receive Fixed Swaps [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	9,346		9,696
Derivative Asset, Fair Value	501	[1]	496	[1]
Derivative Liability, Fair Value	(5)	[1]	(10)	[1]
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Pay Fixed Swaps [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	9,265		9,514
Derivative Asset, Fair Value	8	[1]	12	[1]
Derivative Liability, Fair Value	(536)	[1]	(530)	[1]
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Other Swaps [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	2,944		3,328
Derivative Asset, Fair Value	2	[1]	2	[1]
Derivative Liability, Fair Value	(1)	[1]	(3)	[1]
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Option Trades [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	889		897
Derivative Asset, Fair Value	29	[1]	29	[1]
Derivative Liability, Fair Value	(31)	[1]	(30)	[1]
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Futures Contracts [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	690		1,747
Derivative Asset, Fair Value			1	[1]
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Risk Participations [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	202		180
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	7,114		12,098
Derivative Asset, Fair Value	30	[1]	130	[1]
Derivative Liability, Fair Value	(29)	[1]	(64)	[1]
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Receive Fixed Swaps [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	89		11
Derivative Asset, Fair Value	3	[1]
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Pay Fixed Swaps [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	16		35
Derivative Liability, Fair Value	(1)	[1]
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Interest Rate Lock Commitments [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	2,762		3,922
Derivative Asset, Fair Value	13	[1]	12	[1]
Derivative Liability, Fair Value	(10)	[1]	(37)	[1]
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | When Issued Securities and Forward Rate Agreements and Forward Commitments [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	3,723		7,717
Derivative Asset, Fair Value	11	[1]	106	[1]
Derivative Liability, Fair Value	(18)	[1]	(27)	[1]
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Option Trades [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	500		400
Derivative Asset, Fair Value	3	[1]	11	[1]
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Futures Contracts [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	24		13
Derivative Asset, Fair Value			1	[1]
Not Designated as Hedging Instrument [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	47,022		57,594
Derivative Asset, Fair Value	817	[1]	902	[1]
Derivative Liability, Fair Value	(668)	[1]	(744)	[1]
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	23,712		25,798
Derivative Asset, Fair Value	543	[1]	547	[1]
Derivative Liability, Fair Value	(576)	[1]	(577)	[1]
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Foreign Exchange Contract [Member]
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	376		436
Derivative Asset, Fair Value	3	[1]	7	[1]
Derivative Liability, Fair Value	(3)	[1]	(4)	[1]
Net Investment Hedging [Member]
Notional Amount of Derivatives as Net Investment Hedge	73		73
Net Investment Hedge Derivative Instrument Assets at Fair Value	1	[1]
Net Investment Hedge Derivative Instrument Liabilities at Fair Value			(2)	[1]
Net Investment Hedging [Member] | Foreign Exchange Contract [Member]
Notional Amount of Derivatives as Net Investment Hedge	73		73
Net Investment Hedge Derivative Instrument Assets at Fair Value	1	[1]
Net Investment Hedge Derivative Instrument Liabilities at Fair Value			(2)	[1]
Interest Rate Contract [Member] | Cash Flow Hedges [Member] | Pay Fixed Swaps [Member] | 3 Month LIBOR Funding [Member]
Designated Notional Values, Derivatives as Cash Flow Hedges	5,950	[2]	5,950	[2]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	3	[1],[2]	6	[1],[2]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	(222)	[1],[2]	(181)	[1],[2]
Interest Rate Contract [Member] | Cash Flow Hedges [Member] | Caps [Member] | 3 Month LIBOR Funding [Member]
Designated Notional Values, Derivatives as Cash Flow Hedges			200	[2]
Cash Flow Hedges [Member]
Designated Notional Values, Derivatives as Cash Flow Hedges	5,950	[2]	6,150	[2]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	3	[1],[2]	6	[1],[2]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	(222)	[1],[2]	(181)	[1],[2]
Interest Rate Contract [Member] | Fair Value Hedges [Member]
Notional Value of Derivatives as Fair Value Hedge	5,015		1,569
Fair Value Hedge Assets	119	[1]	25	[1]
Fair Value Hedge Liabilities	(79)	[1]	(75)	[1]
Interest Rate Contract [Member] | Fair Value Hedges [Member] | Pay Fixed Swaps [Member] | Commercial Loans [Member]
Notional Value of Derivatives as Fair Value Hedge	89		54
Fair Value Hedge Liabilities	(1)	[1]
Interest Rate Contract [Member] | Fair Value Hedges [Member] | Pay Fixed Swaps [Member] | Municipal Securities [Member]
Notional Value of Derivatives as Fair Value Hedge	355		355
Fair Value Hedge Liabilities	(78)	[1]	(75)	[1]
Interest Rate Contract [Member] | Fair Value Hedges [Member] | Receive Fixed Swaps and Option Trades [Member] | Long-term Debt [Member]
Notional Value of Derivatives as Fair Value Hedge	4,571		1,160
Fair Value Hedge Assets	$ 119	[1]	$ 25	[1]

[1] Derivatives in a gain position are recorded as Other assets and derivatives in a loss position are recorded as Other liabilities on the Consolidated Balance Sheet.

[2] Cash flow hedges are hedging the first unhedged forecasted settlements associated with the listed hedged item descriptions.