Derivative Instruments And Hedging Activities (Fair Value Amounts Of Derivative Instruments Reported On Our Condensed Consolidated Balance Sheet) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 252,000,000	$ 362,000,000
Derivative Liability, Fair Value, Gross Liability	252,000,000	317,000,000
Notional amount	128,379,000,000	101,221,000,000
Accrued Interest [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	61,000,000	120,000,000
Derivative Liability, Fair Value, Gross Liability	9,000,000	12,000,000
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	79,000,000	207,000,000
Derivative Liability, Fair Value, Gross Liability	109,000,000	169,000,000
Notional amount	22,556,000,000	21,932,000,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	79,000,000	204,000,000
Derivative Liability, Fair Value, Gross Liability	107,000,000	169,000,000
Notional amount	22,181,000,000	21,606,000,000
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	3,000,000
Derivative Liability, Fair Value, Gross Liability	2,000,000	0
Notional amount	375,000,000	326,000,000
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Receive-fixed Swaps, Fair Value, Gross Asset	69,000,000	196,000,000
Receive-fixed Swaps, Fair Value, Gross Liability	101,000,000	163,000,000
Receive-fixed Swaps, Notional Amount	7,100,000,000	8,500,000,000
Pay-fixed Swaps, Fair Value, Gross Asset	10,000,000	9,000,000
Pay-fixed Swaps, Fair Value, Gross Liability	6,000,000	5,000,000
Pay-fixed Swaps, Notional Amount	15,100,000,000	12,600,000,000
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Pay-fixed Swaps, Fair Value, Gross Asset		1,000,000
Pay-fixed Swaps, Notional Amount		495,000,000
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	140,000,000	142,000,000
Derivative Liability, Fair Value, Gross Liability	136,000,000	141,000,000
Notional amount	103,998,000,000	77,543,000,000
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	31,000,000	13,000,000
Derivative Liability, Fair Value, Gross Liability	2,000,000	2,000,000
Notional amount	1,822,000,000	1,743,000,000
Equity Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	2,000,000	0
Derivative Liability, Fair Value, Gross Liability	5,000,000	5,000,000
Notional amount	3,000,000	3,000,000
Interest Rate Swap [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	32,000,000	36,000,000
Derivative Liability, Fair Value, Gross Liability	43,000,000	44,000,000
Notional amount	14,162,000,000	13,613,000,000
Futures and Forwards [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	12,000,000	11,000,000
Derivative Liability, Fair Value, Gross Liability	2,000,000	3,000,000
Notional amount	22,468,000,000	29,836,000,000
Written Options [Member] | Interest Rate Contract [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	91,000,000	94,000,000
Notional amount	27,839,000,000	11,132,000,000
Written Options [Member] | Foreign Exchange Contract [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	0	0
Notional amount	0	17,000,000
Written Options [Member] | Equity Contract [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	5,000,000	5,000,000
Notional amount	3,000,000	3,000,000
Purchased Options [Member] | Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	96,000,000	95,000,000
Derivative Liability, Fair Value, Gross Liability	0	0
Notional amount	39,529,000,000	22,962,000,000
Purchased Options [Member] | Foreign Exchange Contract [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	0	0
Notional amount	0	17,000,000
Purchased Options [Member] | Equity Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	2,000,000	0
Derivative Liability, Fair Value, Gross Liability	0	0
Notional amount	0	0
Swap [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	30,000,000	12,000,000
Derivative Liability, Fair Value, Gross Liability	0	1,000,000
Notional amount	1,377,000,000	1,379,000,000
Foreign Exchange Forward [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,000,000	1,000,000
Derivative Liability, Fair Value, Gross Liability	2,000,000	1,000,000
Notional amount	445,000,000	330,000,000
Other Trading [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	173,000,000	155,000,000
Derivative Liability, Fair Value, Gross Liability	143,000,000	148,000,000
Notional amount	$ 105,823,000,000	$ 79,289,000,000