Securities Available For Sale, Major Categories (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 177,025	$ 164,329
Gross unrealized gains	11,211	11,036
Gross unrealized losses	(1,938)	(2,711)
Securities available for sale	186,298	172,654
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	173,526	160,071
Gross unrealized gains	10,280	10,015
Gross unrealized losses	(1,863)	(2,621)
Securities available for sale	181,943	167,465
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	10,490	1,570
Gross unrealized gains	46	49
Gross unrealized losses	(13)	(15)
Securities available for sale	10,523	1,604
US States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	24,173	18,923
Gross unrealized gains	802	568
Gross unrealized losses	(563)	(837)
Securities available for sale	24,412	18,654
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	105,196	109,862
Gross unrealized gains	7,070	7,152
Gross unrealized losses	(840)	(1,220)
Securities available for sale	111,426	115,794
Federal agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	74,472	78,578
Gross unrealized gains	3,892	3,555
Gross unrealized losses	(26)	(96)
Securities available for sale	78,338	82,037
Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	16,835	18,294
Gross unrealized gains	1,843	2,398
Gross unrealized losses	(318)	(489)
Securities available for sale	18,360	20,203
Commercial [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	13,889	12,990
Gross unrealized gains	1,335	1,199
Gross unrealized losses	(496)	(635)
Securities available for sale	14,728	13,554
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	10,584	9,015
Gross unrealized gains	1,388	1,301
Gross unrealized losses	(75)	(37)
Securities available for sale	11,897	10,279
Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	6,951	4,638
Gross unrealized gains	467	369
Gross unrealized losses	(186)	(229)
Securities available for sale	7,232	4,778
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	16,132	16,063
Gross unrealized gains	507	576
Gross unrealized losses	(186)	(283)
Securities available for sale	16,453	16,356
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	3,499	4,258
Gross unrealized gains	931	1,021
Gross unrealized losses	(75)	(90)
Securities available for sale	4,355	5,189
Perpetual preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	2,930	3,671
Gross unrealized gains	286	250
Gross unrealized losses	(72)	(89)
Securities available for sale	3,144	3,832
Other equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	569	587
Gross unrealized gains	645	771
Gross unrealized losses	(3)	(1)
Securities available for sale	$ 1,211	$ 1,357

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15E
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15C
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558

+ Details

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References+ Details