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Investments - Available-for-Sale Investments (Details) $ in Millions | Mar. 31, 2020 USD ($) Security | Dec. 31, 2019 USD ($) Security
--- | --- | ---
Estimated Fair Value |  |
In a Continuous Loss Position for Less than 12 Months | $ 1,106 | $ 365
In a Continuous Loss Position for 12 Months or More | 0 | 0
Unrealized Losses |  |
In a Continuous Loss Position for Less than 12 Months | 30 | 2
In a Continuous Loss Position for 12 Months or More | $ 0 | $ 0
Total Number of Positions |  |
In a Continuous Loss Position for Less than 12 Months | Security | 825 | 239
In a Continuous Loss Position for 12 Months or More | Security | 0 | 0
Corporate debt securities |  |
Estimated Fair Value |  |
In a Continuous Loss Position for Less than 12 Months | $ 805 | $ 222
In a Continuous Loss Position for 12 Months or More | 0 | 0
Unrealized Losses |  |
In a Continuous Loss Position for Less than 12 Months | 21 | 1
In a Continuous Loss Position for 12 Months or More | $ 0 | $ 0
Total Number of Positions |  |
In a Continuous Loss Position for Less than 12 Months | Security | 627 | 167
In a Continuous Loss Position for 12 Months or More | Security | 0 | 0
Mortgage-backed securities |  |
Estimated Fair Value |  |
In a Continuous Loss Position for Less than 12 Months | $ 211 | $ 143
In a Continuous Loss Position for 12 Months or More | 0 | 0
Unrealized Losses |  |
In a Continuous Loss Position for Less than 12 Months | 8 | 1
In a Continuous Loss Position for 12 Months or More | $ 0 | $ 0
Total Number of Positions |  |
In a Continuous Loss Position for Less than 12 Months | Security | 128 | 72
In a Continuous Loss Position for 12 Months or More | Security | 0 | 0
Asset-backed securities |  |
Estimated Fair Value |  |
In a Continuous Loss Position for Less than 12 Months | $ 90 |
In a Continuous Loss Position for 12 Months or More | 0 |
Unrealized Losses |  |
In a Continuous Loss Position for Less than 12 Months | 1 |
In a Continuous Loss Position for 12 Months or More | $ 0 |
Total Number of Positions |  |
In a Continuous Loss Position for Less than 12 Months | Security | 70 |
In a Continuous Loss Position for 12 Months or More | Security | 0 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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