Securities (Details 1) (USD $) In Millions	3 Months Ended	12 Months Ended
Mar. 31, 2011	Dec. 31, 2010
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	$ 331,119	$ 312,241
Available-for-sale Securities, Gross Unrealized Gains	5,712	6,102
Available-for-sale Securities, Gross Unrealized Losses	2,047	2,025
Available-for-sale securities, fair value	334,784	316,318
Held-to-maturity Securities, Amortized Cost	16	18
Held-to-maturity Securities, Gross unrealized gains	1	2
Held-to-maturity Securities, Gross unrealized losses	0	0
Held-to-maturity Securities, Fair Value	17	20
Equity Securities [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	3,071	1,894
Available-for-sale Securities, Gross Unrealized Gains	174	163
Available-for-sale Securities, Gross Unrealized Losses	0	6
Available-for-sale securities, fair value	3,245	2,051
Debt Securities [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	328,048	310,347
Available-for-sale Securities, Gross Unrealized Gains	5,538	5,939
Available-for-sale Securities, Gross Unrealized Losses	2,047	2,019
Available-for-sale securities, fair value	331,539	314,267
Mortgage-backed securities [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	179,393	171,795
Available-for-sale Securities, Gross Unrealized Gains	3,626	4,032
Available-for-sale Securities, Gross Unrealized Losses	943	973
Available-for-sale securities, fair value	182,076	174,854
US Government Corporations and Agencies Securities [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	119,503	117,364
Available-for-sale Securities, Gross Unrealized Gains	2,762	3,159
Available-for-sale Securities, Gross Unrealized Losses	411	297
Available-for-sale securities, fair value	121,854	120,226
Commercial and other [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	4,584	5,169
Available-for-sale Securities, Gross Unrealized Gains	417	502
Available-for-sale Securities, Gross Unrealized Losses	18	17
Available-for-sale securities, fair value	4,983	5,654
Prime and Alt A [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	2,360	2,173
Available-for-sale Securities, Gross Unrealized Gains	75	81
Available-for-sale Securities, Gross Unrealized Losses	173	250
Available-for-sale securities, fair value	2,262	2,004
Non U S [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	52,946	47,089
Available-for-sale Securities, Gross Unrealized Gains	372	290
Available-for-sale Securities, Gross Unrealized Losses	341	409
Available-for-sale securities, fair value	52,977	46,970
U.S. Treasury and government agencies [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	7,002	11,258
Available-for-sale Securities, Gross Unrealized Gains	88	118
Available-for-sale Securities, Gross Unrealized Losses	35	28
Available-for-sale securities, fair value	7,055	11,348
Obligations of U.S. states and municipalities [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	11,688	11,732
Available-for-sale Securities, Gross Unrealized Gains	164	165
Available-for-sale Securities, Gross Unrealized Losses	414	338
Available-for-sale securities, fair value	11,438	11,559
Certificates of Deposit [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	3,486	3,648
Available-for-sale Securities, Gross Unrealized Gains	3	1
Available-for-sale Securities, Gross Unrealized Losses	0	2
Available-for-sale securities, fair value	3,489	3,647
Non-U.S. government debt securities [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	33,194	20,614
Available-for-sale Securities, Gross Unrealized Gains	164	191
Available-for-sale Securities, Gross Unrealized Losses	108	28
Available-for-sale securities, fair value	33,250	20,777
Corporate Debt Securities [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	63,455	61,718
Available-for-sale Securities, Gross Unrealized Gains	446	495
Available-for-sale Securities, Gross Unrealized Losses	361	419
Available-for-sale securities, fair value	63,540	61,794
Credit card receivables, Asset Backed Securities [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	6,085	7,278
Available-for-sale Securities, Gross Unrealized Gains	331	335
Available-for-sale Securities, Gross Unrealized Losses	0	5
Available-for-sale securities, fair value	6,416	7,608
Collateralized debt obligations, Asset Backed Securities [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	14,459	13,336
Available-for-sale Securities, Gross Unrealized Gains	581	472
Available-for-sale Securities, Gross Unrealized Losses	172	210
Available-for-sale securities, fair value	14,868	13,598
Other, Debt Securities [Member]
Amortized costs and estimated fair values [Abstract]
Available-for-sale Securities, Amortized Cost	9,286	8,968
Available-for-sale Securities, Gross Unrealized Gains	135	130
Available-for-sale Securities, Gross Unrealized Losses	14	16
Available-for-sale securities, fair value	$ 9,407	$ 9,082

Amortized Costs And Estimated Fair Values.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, and certain preferred stock. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 7

-Footnote 2

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

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- Definition

This item represents the gross unrealized gains for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized gains are the excess of the fair value of the Available-for-sale Securities over their carrying value as of the reporting date. Such gross unrealized gains are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge. All or a portion of the unrealized holding gain of an available-for-sale security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13, 19

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This item represents the gross unrealized losses for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized losses are the excess of the carrying value of the Available-for-sale Securities over their fair value as of the reporting date. Such gross unrealized losses are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13, 19

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- Definition

For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity; such investments are measured at amortized cost (carrying value). The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Chapter 3

-Section A

-Paragraph 4, 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 17

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 7, 8, 9, 10, 11

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- Definition

This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 137

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- Definition

As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

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