Investment Securities (Schedule of Gross Pre-Tax Unrealized Losses on Investment Securities) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Asset-Backed Securities [Member] | Non-U.S. Debt Securities [Member]
Available for sale, Fair Value Less than 12 Months	$ 968	$ 464
Available for sale, Gross Unrealized Losses Less than 12 Months	4	2
Available for sale, Fair Value 12 Months or Longer	1,385	1,368
Available for sale, Gross Unrealized Losses 12 Months or Longer	84	120
Available for sale, Fair Value Total	2,353	1,832
Available for sale, Gross Unrealized Losses Total	88	122
Held to maturity, Fair Value Less than 12 Months	32
Held to maturity, Gross Unrealized Losses Less than 12 Months	1
Held to maturity, Fair Value 12 Months or Longer		68
Held to maturity, Gross Unrealized Losses 12 Months or Longer		3
Held to maturity, Fair Value Total	32	68
Held to maturity, Gross Unrealized Losses Total	1	3
Non-U.S. Debt Securities [Member]
Available for sale, Fair Value Less than 12 Months	2,812	3,433
Available for sale, Gross Unrealized Losses Less than 12 Months	17	26
Available for sale, Fair Value 12 Months or Longer	2,498	1,738
Available for sale, Gross Unrealized Losses 12 Months or Longer	105	144
Available for sale, Fair Value Total	5,310	5,171
Available for sale, Gross Unrealized Losses Total	122	170
Non-U.S. Debt Securities [Member] | Other Non-U.S. Debt Securities [Member]
Available for sale, Fair Value Less than 12 Months	74	348
Available for sale, Gross Unrealized Losses Less than 12 Months	1	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	74	348
Available for sale, Gross Unrealized Losses Total	1	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	245
Held to maturity, Gross Unrealized Losses 12 Months or Longer	4
Held to maturity, Fair Value Total	245	206
Held to maturity, Gross Unrealized Losses Total	4	2
Non-U.S. Debt Securities [Member] | Collateralized Mortgage Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	1,770	2,621
Available for sale, Gross Unrealized Losses Less than 12 Months	12	22
Available for sale, Fair Value 12 Months or Longer	1,113	370
Available for sale, Gross Unrealized Losses 12 Months or Longer	21	24
Available for sale, Fair Value Total	2,883	2,991
Available for sale, Gross Unrealized Losses Total	33	46
Held to maturity, Fair Value Less than 12 Months	464	1,445
Held to maturity, Gross Unrealized Losses Less than 12 Months	18	72
Held to maturity, Fair Value 12 Months or Longer	1,452	862
Held to maturity, Gross Unrealized Losses 12 Months or Longer	125	88
Held to maturity, Fair Value Total	1,916	2,307
Held to maturity, Gross Unrealized Losses Total	143	160
Non-U.S. Debt Securities [Member]
Held to maturity, Fair Value Less than 12 Months	496	1,651
Held to maturity, Gross Unrealized Losses Less than 12 Months	19	74
Held to maturity, Fair Value 12 Months or Longer	1,697	930
Held to maturity, Gross Unrealized Losses 12 Months or Longer	129	91
Held to maturity, Fair Value Total	2,193	2,581
Held to maturity, Gross Unrealized Losses Total	148	165
Direct Obligations [Member]
Available for sale, Fair Value Less than 12 Months	1,631
Available for sale, Gross Unrealized Losses Less than 12 Months	6
Available for sale, Fair Value 12 Months or Longer	86	153
Available for sale, Gross Unrealized Losses 12 Months or Longer	1	2
Available for sale, Fair Value Total	1,717	153
Available for sale, Gross Unrealized Losses Total	7	2
Student Loans [Member]
Available for sale, Fair Value Less than 12 Months	1,396	1,980
Available for sale, Gross Unrealized Losses Less than 12 Months	8	25
Available for sale, Fair Value 12 Months or Longer	9,501	7,990
Available for sale, Gross Unrealized Losses 12 Months or Longer	562	599
Available for sale, Fair Value Total	10,897	9,970
Available for sale, Gross Unrealized Losses Total	570	624
Credit Cards [Member]
Available for sale, Fair Value Less than 12 Months	1,259	1,268
Available for sale, Gross Unrealized Losses Less than 12 Months	3	5
Available for sale, Fair Value 12 Months or Longer	2,208	2,396
Available for sale, Gross Unrealized Losses 12 Months or Longer	9	26
Available for sale, Fair Value Total	3,467	3,664
Available for sale, Gross Unrealized Losses Total	12	31
Other Asset-Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	260	90
Available for sale, Gross Unrealized Losses Less than 12 Months	6	1
Available for sale, Fair Value 12 Months or Longer	280	275
Available for sale, Gross Unrealized Losses 12 Months or Longer	50	78
Available for sale, Fair Value Total	540	365
Available for sale, Gross Unrealized Losses Total	56	79
Total Asset-Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	2,915	3,338
Available for sale, Gross Unrealized Losses Less than 12 Months	17	31
Available for sale, Fair Value 12 Months or Longer	13,584	12,430
Available for sale, Gross Unrealized Losses 12 Months or Longer	986	1,049
Available for sale, Fair Value Total	16,499	15,768
Available for sale, Gross Unrealized Losses Total	1,003	1,080
Asset-Backed Securities [Member]
Held to maturity, Fair Value 12 Months or Longer	42	53
Held to maturity, Gross Unrealized Losses 12 Months or Longer	3	5
Held to maturity, Fair Value Total	42	53
Held to maturity, Gross Unrealized Losses Total	3	5
State and Political Subdivisions [Member]
Available for sale, Fair Value Less than 12 Months	386	1,097
Available for sale, Gross Unrealized Losses Less than 12 Months	6	19
Available for sale, Fair Value 12 Months or Longer	1,613	1,967
Available for sale, Gross Unrealized Losses 12 Months or Longer	125	185
Available for sale, Fair Value Total	1,999	3,064
Available for sale, Gross Unrealized Losses Total	131	204
Collateralized Mortgage Obligations [Member]
Available for sale, Fair Value Less than 12 Months	1,028	494
Available for sale, Gross Unrealized Losses Less than 12 Months	20	5
Available for sale, Fair Value 12 Months or Longer	35	109
Available for sale, Gross Unrealized Losses 12 Months or Longer	5	11
Available for sale, Fair Value Total	1,063	603
Available for sale, Gross Unrealized Losses Total	25	16
Held to maturity, Fair Value Less than 12 Months	480	125
Held to maturity, Gross Unrealized Losses Less than 12 Months	8	2
Held to maturity, Fair Value 12 Months or Longer	246	575
Held to maturity, Gross Unrealized Losses 12 Months or Longer	13	42
Held to maturity, Fair Value Total	726	700
Held to maturity, Gross Unrealized Losses Total	21	44
Collateralized Mortgage Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	1,720	6,639
Available for sale, Gross Unrealized Losses Less than 12 Months	4	81
Available for sale, Fair Value 12 Months or Longer	415	431
Available for sale, Gross Unrealized Losses 12 Months or Longer	2	2
Available for sale, Fair Value Total	2,135	7,070
Available for sale, Gross Unrealized Losses Total	6	83
Residential, Subprime, Financing Receivable [Member]
Available for sale, Fair Value Less than 12 Months
Available for sale, Gross Unrealized Losses Less than 12 Months
Available for sale, Fair Value 12 Months or Longer	1,595	1,769
Available for sale, Gross Unrealized Losses 12 Months or Longer	365	346
Available for sale, Fair Value Total	1,595	1,769
Available for sale, Gross Unrealized Losses Total	365	346
Other U.S. Debt Securities [Member]
Available for sale, Fair Value Less than 12 Months	296	330
Available for sale, Gross Unrealized Losses Less than 12 Months	2	7
Available for sale, Fair Value 12 Months or Longer	64	61
Available for sale, Gross Unrealized Losses 12 Months or Longer	7	11
Available for sale, Fair Value Total	360	391
Available for sale, Gross Unrealized Losses Total	9	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	10,788	15,339
Available for sale, Gross Unrealized Losses Less than 12 Months	72	170
Available for sale, Fair Value 12 Months or Longer	18,295	16,889
Available for sale, Gross Unrealized Losses 12 Months or Longer	1,231	1,404
Available for sale, Fair Value Total	29,083	33,228
Available for sale, Gross Unrealized Losses Total	1,303	1,574
Total HTM Securities [Member]
Held to maturity, Fair Value Less than 12 Months	976	1,776
Held to maturity, Gross Unrealized Losses Less than 12 Months	27	76
Held to maturity, Fair Value 12 Months or Longer	1,985	1,558
Held to maturity, Gross Unrealized Losses 12 Months or Longer	145	138
Held to maturity, Fair Value Total	2,961	3,334
Held to maturity, Gross Unrealized Losses Total	$ 172	$ 214