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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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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
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-Topic 210
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Amount of transactions with related party during the financial reporting period.

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