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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | $ 6,115 | $ 5,716 |  |
Premium Receivable, Allowance for Credit Loss | (117) | (109) | $ (109) | $ (105)
Premiums Receivable, Net | 5,998 | 5,607 |  |
Premiums Receivable, Due in One Year or Less, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 5,624 | 5,303 |  |
Premium Receivable, Allowance for Credit Loss | (97) | (89) | (85) | (83)
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 491 | 413 |  |
Premium Receivable, Allowance for Credit Loss | (20) | (20) | $ (24) | $ (22)
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, AA Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 97 | 94 |  |
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, A Rating [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 57 | 54 |  |
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, BBB Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 193 | 136 |  |
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, BB Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 94 | 84 |  |
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, Below BB Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | $ 50 | $ 45 |  |

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