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Investments - Investments - VIEs and Other Collateral Transactions (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Concentration Risk [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 1,000 | $ 1,000 |
Fair value of securities on deposit | 2,300 |  | $ 2,200
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Commitments | 767 | 718 |
US Treasury Securities [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Debt Securities, Available-for-sale, Restricted | $ 35 | $ 47 |

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