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v3.10.0.1

Commitments and Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Entity Information [Line Items] |  |  |  |  |
Premium revenue | $ 4,337 | $ 4,777 | $ 13,174 | $ 14,165 |
Net assets of subsidiaries subject to restrictions | 2,041 |  | 2,041 |  | $ 1,691
Aggregate statutory capital and surplus | 2,125 |  | 2,125 |  |
Required minimum statutory capital surplus | 1,138 |  | $ 1,138 |  |
California Department of Health Care Services |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Premium revenue | $ (57) |  |  |  |

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