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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | $ 6,099 | $ 5,716 |  |
ACL | (111) | (109) | $ (111) | $ (109)
Premiums receivable and agents' balances, net of ACL | 5,988 | 5,607 |  |
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 | 5,676 | 5,303 |  |
ACL | (91) | (89) | (86) | (85)
Receivables for Loss Sensitive Business |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 423 | 413 |  |
ACL | (20) | (20) | $ (25) | $ (24)
Receivables for Loss Sensitive Business | Standard & Poor's, AA Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 93 | 94 |  |
Receivables for Loss Sensitive Business | Standard & Poor's, A Rating [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 57 | 54 |  |
Receivables for Loss Sensitive Business | Standard & Poor's, BBB Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 140 | 136 |  |
Receivables for Loss Sensitive Business | Standard & Poor's, BB Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 88 | 84 |  |
Receivables for Loss Sensitive Business | Standard & Poor's, Below BB Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | $ 45 | $ 45 |  |

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