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Investments - Available-for-Sale (Details) $ in Millions | Dec. 31, 2016 USD ($) Security | Dec. 31, 2015 USD ($) Security
--- | --- | ---
Available-for-sale investments |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 841 | $ 1,135
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 4 | $ 6
Number of Positions, 12 Months or Less (in security) | Security | 580 | 846
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 0 | $ 119
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 0 | $ 1
Number of Positions, 12 Months or More (in security) | Security | 0 | 87
Corporate debt securities |  |
Available-for-sale investments |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 542 | $ 825
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 2 | $ 4
Number of Positions, 12 Months or Less (in security) | Security | 378 | 588
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 0 | $ 119
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 0 | $ 1
Number of Positions, 12 Months or More (in security) | Security | 0 | 87
GSEs |  |
Available-for-sale investments |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 198 | $ 182
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 1 | $ 1
Number of Positions, 12 Months or Less (in security) | Security | 73 | 77
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 0 | $ 0
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 0 | $ 0
Number of Positions, 12 Months or More (in security) | Security | 0 | 0
Municipal securities |  |
Available-for-sale investments |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 101 | $ 128
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 1 | $ 1
Number of Positions, 12 Months or Less (in security) | Security | 129 | 181
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 0 | $ 0
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 0 | $ 0
Number of Positions, 12 Months or More (in security) | Security | 0 | 0

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&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 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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