Business and Summary of Significant Accounting Policies - Trade and Notes Receivable (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
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 |