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Business and Summary of Significant Accounting Policies - Trade and Notes Receivable (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenue Recognition, Milestone Method [Line Items] |  |  |
Insurance commissions as percentage of agent premiums | 76.90% | 77.10% | 76.70%
Premium due from agents, net of accrued sales commissions | $ 35 | $ 74 |
Minimum |  |  |
Revenue Recognition, Milestone Method [Line Items] |  |  |
Accrual for agency premiums reported within three months, percent | 66.00% |  |
Accrual for agency premiums reported within next three months, percent | 6.00% |  |
Accrual for agency premiums, time lag period | 7 months |  |
Maximum |  |  |
Revenue Recognition, Milestone Method [Line Items] |  |  |
Accrual for agency premiums reported within three months, percent | 91.00% |  |
Accrual for agency premiums reported within next three months, percent | 17.00% |  |
Accrual for agency premiums, time lag period | 15 months |  |

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