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Investment Securities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Schedule of Available for Sale Securities by Type |  |
Cost | $ 6,268 | $ 6,806
Gross Unrealized Gains | 453 | 416
Gross Unrealized Losses | (42) | (75)
Investment securities | 6,679 | 7,147
U.S. States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 4,788 | 4,968
Gross Unrealized Gains | 130 | 103
Gross Unrealized Losses | (40) | (72)
Investment securities | 4,878 | 4,999
U.S. Government agency obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 3 | 352
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | 0 | 0
Investment securities | 3 | 354
U.S. Government treasury obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 330 | 330
Gross Unrealized Gains | 8 | 10
Gross Unrealized Losses | 0 | 0
Investment securities | 338 | 340
Corporate debt securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 628 | 626
Gross Unrealized Gains | 7 | 9
Gross Unrealized Losses | (2) | (3)
Investment securities | 633 | 632
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 253 | 261
Gross Unrealized Gains | 16 | 17
Gross Unrealized Losses | 0 | 0
Investment securities | 269 | 278
Equity securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 90 | 95
Gross Unrealized Gains | 281 | 265
Gross Unrealized Losses | 0 | 0
Investment securities | 371 | 360
Foreign government bonds and obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 125 | 120
Gross Unrealized Gains | 10 | 10
Gross Unrealized Losses | 0 | 0
Investment securities | 135 | 130
Availabe For Sale Securities Other [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 51 | 54
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 0 | 0
Investment securities | $ 52 | $ 54

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