AVAILABLE FOR SALE SECURITIES (Details) (BRL) In Millions	Dec. 31, 2010	Dec. 31, 2009
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	43,967	40,637
Gains	1,696	1,495
Losses	(1,027)	(869)
Fair value	44,636	41,263
Investment Funds [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	758	1,247
Gains	14	13
Losses	(2)	(1)
Fair value	770	1,259
Brazilian Federal Government Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	10,681	14,324
Gains	268	140
Losses	(106)	(21)
Fair value	10,843	14,443
Brazilian Government External Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	4,965	2,060
Gains	202	197
Losses	(449)	(277)
Fair value	4,718	1,980
Foreign Government Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	4,737	7,261
Gains	4	25
Losses	(182)	(43)
Fair value	4,559	7,243
Foreign Government Debt Securities Portugal [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	0	26
Gains	0	0
Losses	0	0
Fair value	0	26
Foreign Government Debt Securities United States [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	679	17
Gains	0	0
Losses	0	0
Fair value	679	17
Foreign Government Debt Securities Austria [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	0	212
Gains	0	1
Losses	0	0
Fair value	0	213
Foreign Government Debt Securities Denmark [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	2,109	1,995
Gains	0	6
Losses	(93)	(30)
Fair value	2,016	1,971
Foreign Government Debt Securities Spain [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	777	1,090
Gains	0	3
Losses	(43)	0
Fair value	734	1,093
Foreign Government Debt Securities Korea [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	262	1,750
Gains	0	12
Losses	(26)	(5)
Fair value	236	1,757
Foreign Government Debt Securities Chile [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	454	1,278
Gains	1	3
Losses	(2)	(7)
Fair value	453	1,274
Foreign Government Debt Securities Paraguay [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	272	417
Gains	2	0
Losses	(18)	0
Fair value	256	417
Foreign Government Debt Securities Uruguay [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	184	476
Gains	1	0
Losses	0	(1)
Fair value	185	475
Corporate Debt Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	22,179	14,852
Gains	460	251
Losses	(266)	(137)
Fair value	22,373	14,966
Marketable Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Amortized cost	647	893
Gains	748	869
Losses	(22)	(390)
Fair value	1,373	1,372

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

- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details