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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2017
Investment Securities (Tables) [Abstract] |
Schedule of Available for Sale Securities by Type | The following is a summary of investment securities as of March 31, 2017 an d December 31, 2016:
|  |  | 2017 |  | 2016
|  |  |  |  |  |  | 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 |  | $ | 1,686 |  | $ | 24 |  | $ | (4) |  | $ | 1,706 |  | $ | 2,019 |  | $ | 28 |  | $ | (11) |  | $ | 2,036
U.S. Government agency obligations |  |  | 12 |  |  | ― |  |  | ― |  |  | 12 |  |  | 12 |  |  | ― |  |  | ― |  |  | 12
U.S. Government treasury obligations |  |  | 1,135 |  |  | 7 |  |  | (6) |  |  | 1,136 |  |  | 465 |  |  | 3 |  |  | (8) |  |  | 460
Corporate debt securities |  |  | 19 |  |  | ― |  |  | ― |  |  | 19 |  |  | 19 |  |  | ― |  |  | ― |  |  | 19
Mortgage-backed securities (a) |  |  | 87 |  |  | 3 |  |  | ― |  |  | 90 |  |  | 92 |  |  | 3 |  |  | ― |  |  | 95
Equity securities |  |  | 1 |  |  | ― |  |  | ― |  |  | 1 |  |  | 1 |  |  | ― |  |  | ― |  |  | 1
Foreign government bonds and obligations |  |  | 549 |  |  | 1 |  |  | (1) |  |  | 549 |  |  | 486 |  |  | 1 |  |  | (1) |  |  | 486
Other (b) |  |  | 50 |  |  | ― |  |  | (2) |  |  | 48 |  |  | 50 |  |  | ― |  |  | (2) |  |  | 48
Total |  | $ | 3,539 |  | $ | 35 |  | $ | (13) |  | $ | 3,561 |  | $ | 3,144 |  | $ | 35 |  | $ | (22) |  | $ | 3,157
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, 2017 and December 31, 2016:
|  |  | 2017 |  | 2016
|  |  | 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 |  | $ | 98 |  | $ | (4) |  | $ | ― |  | $ | ― |  | $ | 153 |  | $ | (11) |  | $ | ― |  | $ | ―
U.S. Government treasury obligations |  |  | 299 |  |  | (6) |  |  | ― |  |  | ― |  |  | 298 |  |  | (8) |  |  | ― |  |  | ―
Other |  |  | ― |  |  | ― |  |  | 32 |  |  | (2) |  |  | ― |  |  | ― |  |  | 32 |  |  | (2)
Total |  | $ | 397 |  | $ | (10) |  | $ | 32 |  | $ | (2) |  | $ | 451 |  | $ | (19) |  | $ | 32 |  | $ | (2)
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, 2017 and December 31, 2016:
|  | 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
2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
90%–100% |  | 21 |  | $ | 397 |  | $ | (10) |  | 6 |  | $ | 32 |  | $ | (2) |  | 27 |  | $ | 429 |  | $ | (12)
Total as of March 31, 2017 |  | 21 |  | $ | 397 |  | $ | (10) |  | 6 |  | $ | 32 |  | $ | (2) |  | 27 |  | $ | 429 |  | $ | (12)
2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
90%–100% |  | 33 |  | $ | 411 |  | $ | (13) |  | 6 |  | $ | 32 |  | $ | (2) |  | 39 |  | $ | 443 |  | $ | (15)
Less than 90% |  | 4 |  |  | 40 |  |  | (6) |  | ― |  |  | ― |  |  | ― |  | 4 |  |  | 40 |  |  | (6)
Total as of December 31, 2016 |  | 37 |  | $ | 451 |  | $ | (19) |  | 6 |  | $ | 32 |  | $ | (2) |  | 43 |  | $ | 483 |  | $ | (21)
Contractual maturities of investment securities | Contractual maturities for investment securities with stated maturities as of March 31, 2017 were as follows:
|  |  |  |  |  |  | Estimated
(Millions) |  | Cost |  | Fair Value
Due within 1 year |  | $ | 689 |  | $ | 690
Due after 1 year but within 5 years |  |  | 990 |  |  | 992
Due after 5 years but within 10 years |  |  | 365 |  |  | 369
Due after 10 years |  |  | 1,446 |  |  | 1,462
Total |  | $ | 3,490 |  | $ | 3,513

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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=73527792&loc=d3e27290-111563 + Details
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