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Investments - Available-for-Sale Investments (Details) $ in Millions | Mar. 31, 2019 USD ($) Security | Dec. 31, 2018 USD ($) Security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 207 | $ 509
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 1 | $ 3
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security | 96 | 285
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 612 | $ 694
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 4 | $ 8
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security | 442 | 516
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 207 | $ 509
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 1 | $ 3
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security | 96 | 285
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 403 | $ 412
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 2 | $ 5
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security | 280 | 298
GSEs |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 0 | $ 0
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 0 | $ 0
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security | 0 | 0
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 122 | $ 127
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 1 | $ 1
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security | 71 | 76
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 0 | $ 0
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 0 | $ 0
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security | 0 | 0
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 87 | $ 87
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 1 | $ 1
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security | 91 | 90
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value |  | $ 0
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses |  | $ 0
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security |  | 0
In a Continuous Loss Position for 12 Months or More, Estimated Fair value |  | $ 68
In a Continuous Loss Position for 12 Months or More, Unrealized Losses |  | $ 1
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security |  | 52

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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. + References Reference 1: 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=82897076&loc=d3e27337-111563 + Details
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