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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | $ 6,512 | $ 6,115 |  |
ACL | (126) | (117) | $ (111) | $ (109)
Premiums receivable and agents' balances, net of ACL | 6,386 | 5,998 |  |
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums ("loss sensitive business") |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 6,027 | 5,624 |  |
ACL | (105) | (97) | (91) | (89)
Receivables for Loss Sensitive Business |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 485 | 491 |  |
ACL | (21) | (20) | $ (20) | $ (20)
Receivables for Loss Sensitive Business | Standard & Poor's, AA Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 95 | 97 |  |
Receivables for Loss Sensitive Business | Standard & Poor's, A Rating [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 56 | 57 |  |
Receivables for Loss Sensitive Business | Standard & Poor's, BBB Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 190 | 193 |  |
Receivables for Loss Sensitive Business | Standard & Poor's, BB Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 95 | 94 |  |
Receivables for Loss Sensitive Business | Standard & Poor's, Below BB Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | $ 49 | $ 50 |  |

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