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Investments - Available-for-Sale (Details) $ in Millions | Dec. 31, 2018 USD ($) Security | Dec. 31, 2017 USD ($) Security
--- | --- | ---
Available-for-sale investments |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 509 | $ 1,940
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 3 | $ 5
Number of Positions, 12 Months or Less (in security) | Security | 285 | 719
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 694 | $ 227
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 8 | $ 3
Number of Positions, 12 Months or More (in security) | Security | 516 | 164
Corporate debt securities |  |
Available-for-sale investments |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 509 | $ 1,297
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 3 | $ 3
Number of Positions, 12 Months or Less (in security) | Security | 285 | 561
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 412 | $ 94
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 5 | $ 1
Number of Positions, 12 Months or More (in security) | Security | 298 | 69
GSEs |  |
Available-for-sale investments |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 0 | $ 173
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 0 | $ 1
Number of Positions, 12 Months or Less (in security) | Security | 0 | 69
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 127 | $ 95
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 1 | $ 1
Number of Positions, 12 Months or More (in security) | Security | 76 | 47
U.S. Treasury notes |  |
Available-for-sale investments |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value |  | $ 470
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses |  | $ 1
Number of Positions, 12 Months or Less (in security) | Security |  | 89
In a Continuous Loss Position for 12 Months or More, Estimated Fair value |  | $ 0
In a Continuous Loss Position for 12 Months or More, Unrealized Losses |  | $ 0
Number of Positions, 12 Months or More (in security) | Security |  | 0
Municipal securities |  |
Available-for-sale investments |  |
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
Number of Positions, 12 Months or Less (in security) | Security | 0 | 0
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 87 | $ 38
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 1 | $ 1
Number of Positions, 12 Months or More (in security) | Security | 90 | 48
Asset-backed securities |  |
Available-for-sale investments |  |
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 |
Number of Positions, 12 Months or Less (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 |
Number of Positions, 12 Months or More (in security) | Security | 52 |

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