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Investment Securities | 12 Months Ended
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Dec. 31, 2012
Investment Securities [Abstract] |
Investment Securities | NOTE 6 Investment S ecurities Investment securities include debt and equity securities classified as available for sale. The Company's investment securities, principally debt securities, are carried at fair value on the Consolidated Balanc e Sheets with unrealized gains (losses) recorded in AOCI, net of income tax es. Realized gains and losses are recognized in results of operations upon disposition of the securities using the specific identification method on a trade date basis. Refer to Note 3 for a description of the Company's methodology for determining the fair value of investment securities. The following is a summary of investment securities as of December 31:
|  | 2012 |  | 2011
|  |  |  |  | Gross |  | Gross |  | Estimated |  |  |  |  | Gross |  | Gross |  | Estimated
|  |  |  | Unrealized | Unrealized |  | Fair |  |  | Unrealized | Unrealized |  | Fair
Description of Securities (Millions) |  |  | Cost | Gains | Losses |  | Value |  | Cost | Gains | Losses |  | Value
State and municipal obligations |  | $ | 4,280 |  | $ | 199 |  | $ | (5) |  | $ | 4,474 |  | $ | 4,968 |  | $ | 103 |  | $ | (72) |  | $ | 4,999
U.S. Government agency obligations |  |  | 3 |  |  | ― |  |  | ― |  |  | 3 |  |  | 352 |  |  | 2 |  |  | ― |  |  | 354
U.S. Government treasury obligations |  |  | 330 |  |  | 8 |  |  | ― |  |  | 338 |  |  | 330 |  |  | 10 |  |  | ― |  |  | 340
Corporate debt securities(a) |  |  | 73 |  |  | 6 |  |  | ― |  |  | 79 |  |  | 626 |  |  | 9 |  |  | (3) |  |  | 632
Mortgage-backed securities(b) |  |  | 210 |  |  | 14 |  |  | ― |  |  | 224 |  |  | 261 |  |  | 17 |  |  | ― |  |  | 278
Equity securities(c) |  |  | 64 |  |  | 232 |  |  | ― |  |  | 296 |  |  | 95 |  |  | 265 |  |  | ― |  |  | 360
Foreign government bonds and obligations |  |  | 134 |  |  | 15 |  |  | ― |  |  | 149 |  |  | 120 |  |  | 10 |  |  | ― |  |  | 130
Other(d) |  |  | 51 |  |  | ― |  |  | ― |  |  | 51 |  |  | 54 |  |  | ― |  |  | ― |  |  | 54
Total |  | $ | 5,145 |  | $ | 474 |  | $ | (5) |  | $ | 5,614 |  | $ | 6,806 |  | $ | 416 |  | $ | (75) |  | $ | 7,147
The December 31, 2012 and 2011 balance s include, on a cost basis, nil and $600 m illion, respectively, of corporate debt obligations issued under the Temporary Liquidity Guarantee Program (TLGP) that are guaranteed by the Federal Deposit Insurance Corporation (FDIC). Represents mortgage-backed securities guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae. Primarily r epresents the Company's investment in the Industrial and Commercial Bank of China (ICBC). Other comprises investments in various mutual funds. The following table provides information about the Company's investment securities with gross unrealized losses and the length of time that individual securities have been in a continuous unrealized loss position as of December 31:
|  |  |  | 2012 |  | 2011
|  | Less than 12 months |  | 12 months or more |  | Less than 12 months |  | 12 months or more
|  |  |  |  |  |  | Gross |  |  |  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross
|  |  |  | Estimated | Unrealized | Estimated | Unrealized |  | Estimated | Unrealized | Estimated | Unrealized
Description of Securities (Millions) |  | Fair Value | Losses | Fair Value | Losses |  | Fair Value | Losses | Fair Value | Losses
State and municipal obligations |  | $ | 100 |  | $ | (1) |  | $ | 73 |  | $ | (4) |  | $ | ― |  | $ | ― |  | $ | 1,094 |  | $ | (72)
Corporate debt securities |  |  | ― |  |  | ― |  |  | ― |  |  | ― |  |  | 15 |  |  | (2) |  |  | 2 |  |  | (1)
Total |  | $ | 100 |  | $ | (1) |  | $ | 73 |  | $ | (4) |  | $ | 15 |  | $ | (2) |  | $ | 1,096 |  | $ | (73)
The following table summarizes the gross unrealized losses due to temporary impairments by ratio of fair value to amortized cost as of December 31:
|  | Less than 12 months |  | 12 months or more |  | Total
|  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross
Ratio of Fair Value to |  | Number of | Estimated | Unrealized |  | Number of | Estimated | Unrealized |  | Number of | Estimated | Unrealized
Amortized Cost (Dollars in millions) |  | Securities | Fair Value | Losses |  | Securities | Fair Value | Losses |  | Securities | Fair Value | Losses
2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
90%–100% |  | 46 |  | $ | 100 |  | $ | (1) |  | 4 |  | $ | 73 |  | $ | (4) |  | 50 |  | $ | 173 |  | $ | (5)
Total as of December 31, 2012 |  | 46 |  | $ | 100 |  | $ | (1) |  | 4 |  | $ | 73 |  | $ | (4) |  | 50 |  | $ | 173 |  | $ | (5)
2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
90%–100% |  | ― |  | $ | ― |  | $ | ― |  | 114 |  | $ | 884 |  | $ | (35) |  | 114 |  | $ | 884 |  | $ | (35)
Less than 90% |  | 1 |  |  | 15 |  |  | (2) |  | 22 |  |  | 212 |  |  | (38) |  | 23 |  |  | 227 |  |  | (40)
Total as of December 31, 2011 |  | 1 |  | $ | 15 |  | $ | (2) |  | 136 |  | $ | 1,096 |  | $ | (73) |  | 137 |  | $ | 1,111 |  | $ | (75)
The gross unrealized losses are attributed to overall wider credit spreads for state and municipal securities, wider credit spreads for specific issuers, adverse changes in market benchmark interest rates, or a combination thereof, all as compared to those prevailing wh en the investment securities were acquired. Overall, for the investment securities in gross unrealized loss positions identified above, (i) the Company does not intend to sell the investment s ecurities, (ii) it is more likely than not that the Company will not be required to sell the investment securities before recovery of the unrealized losses, and (iii) the Company expects that the contractual principal and interest will be received on the investment securities. As a result, the Company recognized no o ther-than-temporary impairments during the periods presented. Supplemental I nformation Gross realized gains and losses on the sales of investment securities, included in other non-interest revenues, were as follows:
(Millions) |  | 2012 |  | 2011 |  | 2010
Gains |  | $ | 127 |  | $ | 16 |  | $ | 1
Losses |  |  | (1) |  |  | ― |  |  | (6)
Total |  | $ | 126 |  | $ | 16 |  | $ | (5)
Contractual maturities of investment securities, excluding equity securities and other securities, as of December 31, 2012 we re as follows:
|  |  |  |  |  | Estimated
(Millions) | Cost | Fair Value
Due within 1 year |  | $ | 318 |  | $ | 319
Due after 1 year but within 5 years |  |  | 255 |  |  | 264
Due after 5 years but within 10 years |  |  | 204 |  |  | 220
Due after 10 years |  |  | 4,253 |  |  | 4,464
Total |  | $ | 5,030 |  | $ | 5,267
The expected payments on state and municipal obligations and mortgage-backed securities may not coincide with their contractual maturities because the issuers have the right to call or prepay certain obligations.

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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