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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2016
Investment Securities (Tables) [Abstract] |
Schedule of Available for Sale Securities by Type | The following is a summ ary of investment securities as of March 31, 2016 and December 31, 2015:
|  |  | 2016 |  | 2015
|  |  |  |  |  |  | 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 |  | $ | 2,695 |  | $ | 76 |  | $ | (4) |  | $ | 2,767 |  | $ | 2,813 |  | $ | 85 |  | $ | (5) |  | $ | 2,893
U.S. Government agency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| obligations |  |  | 2 |  |  | ― |  |  | ― |  |  | 2 |  |  | 2 |  |  | ― |  |  | ― |  |  | 2
U.S. Government treasury |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| obligations |  |  | 375 |  |  | 10 |  |  | ― |  |  | 385 |  |  | 406 |  |  | 4 |  |  | (1) |  |  | 409
Corporate debt securities |  |  | 28 |  |  | 1 |  |  | ― |  |  | 29 |  |  | 29 |  |  | 1 |  |  | ― |  |  | 30
Mortgage-backed securities (a) |  |  | 117 |  |  | 5 |  |  | ― |  |  | 122 |  |  | 117 |  |  | 4 |  |  | ― |  |  | 121
Equity securities |  |  | 1 |  |  | ― |  |  | ― |  |  | 1 |  |  | 1 |  |  | ― |  |  | ― |  |  | 1
Foreign government bonds and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| obligations |  |  | 477 |  |  | 7 |  |  | ― |  |  | 484 |  |  | 250 |  |  | 6 |  |  | (1) |  |  | 255
Other (b) |  |  | 50 |  |  | 1 |  |  | (2) |  |  | 49 |  |  | 50 |  |  | ― |  |  | (2) |  |  | 48
Total |  | $ | 3,745 |  | $ | 100 |  | $ | (6) |  | $ | 3,839 |  | $ | 3,668 |  | $ | 100 |  | $ | (9) |  | $ | 3,759
Represents mortgage-backed securities guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae. Other comprises investments in various mutual funds.
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 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 March 31, 2016 and December 31, 2015:
|  |  | 2016 |  |  | 2015 |
|  |  | Less than 12 months |  |  | 12 months or more |  |  | Less than 12 months |  | 12 months or more |
|  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  | Gross |
Description of Securities (Millions) |  |  | Estimated Fair Value |  | Unrealized Losses |  |  |  | Estimated Fair Value |  | Unrealized Losses |  |  |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |
State and municipal obligations |  | $ | 97 |  | $ | (4) |  |  | $ | ― |  |  | ― |  |  | $ | 100 |  | $ | (3) |  | $ | 13 |  | $ | (2) |
U.S. Government treasury |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| obligations |  |  | ― |  |  | ― |  |  |  | ― |  |  | ― |  |  |  | 253 |  |  | (1) |  |  | ― |  |  | ― |
Foreign government bonds and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| obligations |  |  | ― |  |  | ― |  |  |  | ― |  |  | ― |  |  |  | 99 |  |  | (1) |  |  | ― |  |  | ― |
Other |  |  | ― |  |  | ― |  |  |  | 33 |  |  | (2) |  |  |  | ― |  |  | ― |  |  | 33 |  |  | (2) |
Total |  | $ | 97 |  | $ | (4) |  |  | $ | 33 |  | $ | (2) |  |  | $ | 452 |  | $ | (5) |  | $ | 46 |  | $ | (4) |
Available for Sale Securities Ratio of Fair Value to Amortized Cost | The following table summarizes the gross unrealized losses due to temporary impairments by ratio of fair value to amortized cost as of March 31, 2016 and December 31, 2015:
|  | Less than 12 months |  | 12 months or more |  | Total
Ratio of Fair Value to |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  | Gross
Amortized Cost |  | Number of |  | Estimated |  | Unrealized |  | Number of |  | Estimated |  | Unrealized |  | Number of |  | Estimated |  | Unrealized
(Dollars in millions) |  | Securities |  | Fair Value |  | Losses |  | Securities |  | Fair Value |  | Losses |  | Securities |  | Fair Value |  | Losses
2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
90%–100% |  | 14 |  | $ | 97 |  | $ | (4) |  | 6 |  | $ | 33 |  | $ | (2) |  | 20 |  | $ | 130 |  | $ | (6)
Less than 90% |  | ― |  |  | ― |  |  | ― |  | ― |  |  | ― |  |  | ― |  | ― |  |  | ― |  |  | ―
Total as of March 31, 2016 |  | 14 |  | $ | 97 |  | $ | (4) |  | 6 |  | $ | 33 |  | $ | (2) |  | 20 |  | $ | 130 |  | $ | (6)
2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
90%–100% |  | 52 |  | $ | 450 |  | $ | (5) |  | 15 |  | $ | 37 |  | $ | (2) |  | 67 |  | $ | 487 |  | $ | (7)
Less than 90% |  | ― |  |  | ― |  |  | ― |  | 2 |  |  | 9 |  |  | (2) |  | 2 |  |  | 9 |  |  | (2)
Total as of December 31, 2015 |  | 52 |  | $ | 450 |  | $ | (5) |  | 17 |  | $ | 46 |  | $ | (4) |  | 69 |  | $ | 496 |  | $ | (9)
Contractual maturities of investment securities | C ontractual maturities of investment securities with stated maturities as of March 31, 2016 were as follows:
|  |  |  |  |  |  | Estimated
(Millions) |  | Cost |  | Fair Value
Due within 1 year |  | $ | 556 |  | $ | 557
Due after 1 year but within 5 years |  |  | 209 |  |  | 214
Due after 5 years but within 10 years |  |  | 410 |  |  | 430
Due after 10 years |  |  | 2,519 |  |  | 2,588
Total(a) |  | $ | 3,694 |  | $ | 3,789
Balances primarily represent investments in state and municipal obligations, and foreign government bonds and obligations.

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + 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=27724398&loc=d3e27290-111563 + Details
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