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Schedule 2 - Parent Company Financial Statements - Footnotes to Schedule (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Jul. 02, 2018
Senior Note Due on September Nineteen,Twenty Twenty Two [Member] | Senior Notes [Member] | Infinity [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Stated interest rate, percentage |  | 5.00%
Subsidiary of Common Parent [Member] | Non-cash Dividends [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Related Party Transaction, Amounts of Transaction | $ 574 |
Subsidiary of Common Parent [Member] | Non-cash Capital Contributions [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Related Party Transaction, Amounts of Transaction | 350 |
United Insurance Company Of America [Member] | Proceeds From Related Party [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Related Party Transaction, Amounts of Transaction | 55 |
Infinity Property and Casualty Corporation [Member] | Payments To Related Party [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Related Party Transaction, Amounts of Transaction | $ 83 |

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