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Investments - Investments - VIEs and Other Collateral Transactions (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Concentration Risk [Line Items] |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 1,000 | $ 920
Fair value of securities on deposit | 2,500 | 2,500
U.S. Treasuries |  |
Concentration Risk [Line Items] |  |
Debt Securities, Available-for-sale, Restricted | 46 | 104
Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Concentration Risk [Line Items] |  |
Variable Interest Entity, Reporting Entity Involvement, Commitments | $ 689 | $ 0

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