Investment Securities (Schedule Of Gross Pre-Tax Unrealized Losses On Investment Securities) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Asset-Backed Securities [Member] \| Non-U.S. Debt Securities [Member]
Available for sale, Fair Value Less than 12 Months	$ 2,118
Available for sale, Gross Unrealized Losses Less than 12 Months	5
Available for sale, Fair Value 12 Months or Longer	47	54
Available for sale, Gross Unrealized Losses 12 Months or Longer	6	17
Available for sale, Fair Value Total	2,165	54
Available for sale, Gross Unrealized Losses Total	11	17
Held to maturity, Fair Value Less than 12 Months
Held to maturity, Gross Unrealized Losses Less than 12 Months
Held to maturity, Fair Value 12 Months or Longer	65	68
Held to maturity, Gross Unrealized Losses 12 Months or Longer	3	3
Held to maturity, Fair Value Total	65	68
Held to maturity, Gross Unrealized Losses Total	3	3
Non-U.S. Debt Securities [Member]
Available for sale, Fair Value Less than 12 Months	7,130	2,969
Available for sale, Gross Unrealized Losses Less than 12 Months	52	24
Available for sale, Fair Value 12 Months or Longer	1,097	424
Available for sale, Gross Unrealized Losses 12 Months or Longer	38	41
Available for sale, Fair Value Total	8,227	3,393
Available for sale, Gross Unrealized Losses Total	90	65
Non-U.S. Debt Securities [Member] \| Other Non-U.S. Debt Securities [Member]
Available for sale, Fair Value Less than 12 Months	243	348
Available for sale, Gross Unrealized Losses Less than 12 Months	9	2
Available for sale, Fair Value 12 Months or Longer
Available for sale, Gross Unrealized Losses 12 Months or Longer
Available for sale, Fair Value Total	243	348
Available for sale, Gross Unrealized Losses Total	9	2
Held to maturity, Fair Value Less than 12 Months		206
Held to maturity, Gross Unrealized Losses Less than 12 Months		2
Held to maturity, Fair Value 12 Months or Longer	145
Held to maturity, Gross Unrealized Losses 12 Months or Longer	16
Held to maturity, Fair Value Total	145	206
Held to maturity, Gross Unrealized Losses Total	16	2
Non-U.S. Debt Securities [Member] \| Mortgage-Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	4,769	2,621
Available for sale, Gross Unrealized Losses Less than 12 Months	38	22
Available for sale, Fair Value 12 Months or Longer	1,050	370
Available for sale, Gross Unrealized Losses 12 Months or Longer	32	24
Available for sale, Fair Value Total	5,819	2,991
Available for sale, Gross Unrealized Losses Total	70	46
Held to maturity, Fair Value Less than 12 Months	245	1,445
Held to maturity, Gross Unrealized Losses Less than 12 Months	14	72
Held to maturity, Fair Value 12 Months or Longer	1,319	862
Held to maturity, Gross Unrealized Losses 12 Months or Longer	201	88
Held to maturity, Fair Value Total	1,564	2,307
Held to maturity, Gross Unrealized Losses Total	215	160
Non-U.S. Debt Securities [Member]
Held to maturity, Fair Value Less than 12 Months	245	1,651
Held to maturity, Gross Unrealized Losses Less than 12 Months	14	74
Held to maturity, Fair Value 12 Months or Longer	1,529	930
Held to maturity, Gross Unrealized Losses 12 Months or Longer	220	91
Held to maturity, Fair Value Total	1,774	2,581
Held to maturity, Gross Unrealized Losses Total	234	165
Direct Obligations [Member]
Available for sale, Fair Value Less than 12 Months	1,873
Available for sale, Gross Unrealized Losses Less than 12 Months	1
Available for sale, Fair Value 12 Months or Longer	75	153
Available for sale, Gross Unrealized Losses 12 Months or Longer	1	2
Available for sale, Fair Value Total	1,948	153
Available for sale, Gross Unrealized Losses Total	2	2
Mortgage-Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	1,716	6,639
Available for sale, Gross Unrealized Losses Less than 12 Months	5	81
Available for sale, Fair Value 12 Months or Longer	388	431
Available for sale, Gross Unrealized Losses 12 Months or Longer	2	2
Available for sale, Fair Value Total	2,104	7,070
Available for sale, Gross Unrealized Losses Total	7	83
Student Loans [Member]
Available for sale, Fair Value Less than 12 Months	2,258	1,980
Available for sale, Gross Unrealized Losses Less than 12 Months	14	25
Available for sale, Fair Value 12 Months or Longer	10,360	8,457
Available for sale, Gross Unrealized Losses 12 Months or Longer	644	627
Available for sale, Fair Value Total	12,618	10,437
Available for sale, Gross Unrealized Losses Total	658	652
Credit Cards [Member]
Available for sale, Fair Value Less than 12 Months	2,336	1,268
Available for sale, Gross Unrealized Losses Less than 12 Months	7	5
Available for sale, Fair Value 12 Months or Longer	1,530	2,396
Available for sale, Gross Unrealized Losses 12 Months or Longer	8	26
Available for sale, Fair Value Total	3,866	3,664
Available for sale, Gross Unrealized Losses Total	15	31
Sub-Prime [Member]
Available for sale, Fair Value Less than 12 Months	17
Available for sale, Gross Unrealized Losses Less than 12 Months	2
Available for sale, Fair Value 12 Months or Longer	1,440	1,769
Available for sale, Gross Unrealized Losses 12 Months or Longer	445	346
Available for sale, Fair Value Total	1,457	1,769
Available for sale, Gross Unrealized Losses Total	447	346
Other Asset-Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	939	269
Available for sale, Gross Unrealized Losses Less than 12 Months	16	3
Available for sale, Fair Value 12 Months or Longer	1,146	1,122
Available for sale, Gross Unrealized Losses 12 Months or Longer	106	153
Available for sale, Fair Value Total	2,085	1,391
Available for sale, Gross Unrealized Losses Total	122	156
Total Asset-Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	5,550	3,517
Available for sale, Gross Unrealized Losses Less than 12 Months	39	33
Available for sale, Fair Value 12 Months or Longer	14,476	13,744
Available for sale, Gross Unrealized Losses 12 Months or Longer	1,203	1,152
Available for sale, Fair Value Total	20,026	17,261
Available for sale, Gross Unrealized Losses Total	1,242	1,185
Asset-Backed Securities [Member]
Held to maturity, Fair Value 12 Months or Longer	34	53
Held to maturity, Gross Unrealized Losses 12 Months or Longer	4	5
Held to maturity, Fair Value Total	34	53
Held to maturity, Gross Unrealized Losses Total	4	5
State And Political Subdivisions [Member]
Available for sale, Fair Value Less than 12 Months	463	1,097
Available for sale, Gross Unrealized Losses Less than 12 Months	6	19
Available for sale, Fair Value 12 Months or Longer	1,524	1,967
Available for sale, Gross Unrealized Losses 12 Months or Longer	149	185
Available for sale, Fair Value Total	1,987	3,064
Available for sale, Gross Unrealized Losses Total	155	204
Collateralized Mortgage Obligations [Member]
Available for sale, Fair Value Less than 12 Months	1,670	494
Available for sale, Gross Unrealized Losses Less than 12 Months	53	5
Available for sale, Fair Value 12 Months or Longer	32	109
Available for sale, Gross Unrealized Losses 12 Months or Longer	6	11
Available for sale, Fair Value Total	1,702	603
Available for sale, Gross Unrealized Losses Total	59	16
Held to maturity, Fair Value Less than 12 Months	770	125
Held to maturity, Gross Unrealized Losses Less than 12 Months	38	2
Held to maturity, Fair Value 12 Months or Longer	234	575
Held to maturity, Gross Unrealized Losses 12 Months or Longer	19	42
Held to maturity, Fair Value Total	1,004	700
Held to maturity, Gross Unrealized Losses Total	57	44
Other U.S. Debt Securities [Member]
Available for sale, Fair Value Less than 12 Months	331	330
Available for sale, Gross Unrealized Losses Less than 12 Months	4	7
Available for sale, Fair Value 12 Months or Longer	61	61
Available for sale, Gross Unrealized Losses 12 Months or Longer	10	11
Available for sale, Fair Value Total	392	391
Available for sale, Gross Unrealized Losses Total	14	18
U.S. Equity Securities [Member]
Available for sale, Fair Value Less than 12 Months		8
Available for sale, Gross Unrealized Losses Less than 12 Months		1
Available for sale, Fair Value 12 Months or Longer
Available for sale, Gross Unrealized Losses 12 Months or Longer
Available for sale, Fair Value Total		8
Available for sale, Gross Unrealized Losses Total		1
Total AFS Securities [Member]
Available for sale, Fair Value Less than 12 Months	18,738	15,054
Available for sale, Gross Unrealized Losses Less than 12 Months	161	170
Available for sale, Fair Value 12 Months or Longer	17,653	16,889
Available for sale, Gross Unrealized Losses 12 Months or Longer	1,409	1,404
Available for sale, Fair Value Total	36,391	31,943
Available for sale, Gross Unrealized Losses Total	1,570	1,574
Total HTM Securities [Member]
Held to maturity, Fair Value Less than 12 Months	1,015	1,776
Held to maturity, Gross Unrealized Losses Less than 12 Months	52	76
Held to maturity, Fair Value 12 Months or Longer	1,797	1,558
Held to maturity, Gross Unrealized Losses 12 Months or Longer	243	138
Held to maturity, Fair Value Total	2,812	3,334
Held to maturity, Gross Unrealized Losses Total	295	214
Non-U.S. Equity Securities [Member]
Available for sale, Fair Value Less than 12 Months	5
Available for sale, Gross Unrealized Losses Less than 12 Months	1
Available for sale, Fair Value Total	5
Available for sale, Gross Unrealized Losses Total	$ 1

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