Derivative Instruments And Hedging Activities (Fair Value Amounts Of Derivative Instruments Reported On Our Condensed Consolidated Balance Sheet) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 300,000,000	$ 2,298,000,000
Derivative Liability, Fair Value, Gross Liability	228,000,000	2,468,000,000
Notional amount	71,398,000,000	236,237,000,000
Accrued Interest [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	74,000,000	175,000,000
Derivative Liability, Fair Value, Gross Liability	4,000,000	144,000,000
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	144,000,000	446,000,000
Derivative Liability, Fair Value, Gross Liability	150,000,000	63,000,000
Notional amount	15,069,000,000	18,521,000,000
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	156,000,000	1,852,000,000
Derivative Liability, Fair Value, Gross Liability	78,000,000	2,405,000,000
Notional amount	56,329,000,000	217,716,000,000
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	144,000,000	411,000,000
Derivative Liability, Fair Value, Gross Liability	103,000,000	10,000,000
Notional amount	13,562,000,000	9,828,000,000
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	99,000,000	1,847,000,000
Derivative Liability, Fair Value, Gross Liability	77,000,000	2,378,000,000
Notional amount	54,819,000,000	215,252,000,000
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	144,000,000	411,000,000
Derivative Liability, Fair Value, Gross Liability	102,000,000	0
Notional amount	12,864,000,000	7,248,000,000
Receive-fixed Swaps, Fair Value, Gross Asset	144,000,000	411,000,000
Receive-fixed Swaps, Fair Value, Gross Liability	98,000,000	0
Receive-fixed Swaps, Notional Amount	9,000,000,000	7,200,000,000
Pay-fixed Swaps, Fair Value, Gross Asset	0	0
Pay-fixed Swaps, Fair Value, Gross Liability	4,000,000	0
Pay-fixed Swaps, Notional Amount	3,900,000,000	0
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	1,000,000	10,000,000
Notional amount	698,000,000	2,580,000,000
Mortgage Servicing Rights And Retained Interests [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	1,616,000,000
Derivative Liability, Fair Value, Gross Liability	0	2,299,000,000
Notional amount	0	146,405,000,000
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	0	49,000,000
Derivative Liability, Fair Value, Gross Liability	0	23,000,000
Notional amount	0	9,617,000,000
Debt Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	36,000,000	28,000,000
Derivative Liability, Fair Value, Gross Liability	32,000,000	29,000,000
Notional amount	10,713,000,000	17,716,000,000
Other Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	63,000,000	154,000,000
Derivative Liability, Fair Value, Gross Liability	45,000,000	27,000,000
Notional amount	44,106,000,000	41,514,000,000
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	35,000,000
Derivative Liability, Fair Value, Gross Liability	47,000,000	53,000,000
Notional amount	1,507,000,000	8,693,000,000
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	57,000,000	5,000,000
Derivative Liability, Fair Value, Gross Liability	1,000,000	27,000,000
Notional amount	1,510,000,000	2,464,000,000
Eurodollar Future [Member] | Other Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	17,000,000	32,000,000
Derivative Liability, Fair Value, Gross Liability	3,000,000	5,000,000
Notional amount	34,100,000,000	24,200,000,000
Options Held [Member] | Other Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	4,000,000	1,000,000
Derivative Liability, Fair Value, Gross Liability	5,000,000	8,000,000
Notional amount	$ 567,000,000	$ 554,000,000