Derivative Instruments And Hedging Activities (Fair Value Amounts Of Derivative Instruments Reported On Our Condensed Consolidated Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 4,874	$ 5,701
Derivative Liability, Fair Value, Gross Liability	5,072	5,379
Notional amount	501,016	643,238
Accrued Interest [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	367	459
Derivative Liability, Fair Value, Gross Liability	380	458
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	588	416
Derivative Liability, Fair Value, Gross Liability	31	58
Notional amount	16,324	19,606
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	4,286	5,285
Derivative Liability, Fair Value, Gross Liability	5,041	5,321
Notional amount	484,692	623,632
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	444	293
Derivative Liability, Fair Value, Gross Liability	2	4
Notional amount	9,751	11,398
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	4,183	5,148
Derivative Liability, Fair Value, Gross Liability	4,991	5,274
Notional amount	474,463	616,063
Mortgage Servicing Rights And Retained Interests [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	3,891	4,812
Derivative Liability, Fair Value, Gross Liability	4,822	5,012
Notional amount	396,513	523,037
Mortgage Loan Commitments And Mortgage Loans Held-For-Sale [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	109	95
Derivative Liability, Fair Value, Gross Liability	53	107
Notional amount	13,490	24,950
Debt Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	54	81
Derivative Liability, Fair Value, Gross Liability	80	54
Notional amount	20,952	25,934
Other [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	129	160
Derivative Liability, Fair Value, Gross Liability	36	101
Notional amount	43,508	42,142
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	103	137
Derivative Liability, Fair Value, Gross Liability	50	47
Notional amount	10,229	7,569
Fair Value Hedging [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	444	289
Derivative Liability, Fair Value, Gross Liability	0	4
Notional amount	7,171	8,398
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	4
Derivative Liability, Fair Value, Gross Liability	2	0
Notional amount	2,580	3,000
Net Investment Hedging [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	144	123
Derivative Liability, Fair Value, Gross Liability	29	54
Notional amount	$ 6,573	$ 8,208