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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | $ 5,652 |  | $ 5,058 |  |  |
ACL | (117) | $ (119) | (109) | $ (108) | $ (107) | $ (105)
Premiums receivable and agents' balances, net of ACL | 5,535 |  | 4,949 |  |  |
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 | 5,281 |  | 4,698 |  |  |
ACL | (92) | (94) | (85) | (85) | (84) | (83)
Receivables for Loss Sensitive Business |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 371 |  | 360 |  |  |
ACL | (25) | $ (25) | (24) | $ (23) | $ (23) | $ (22)
Receivables for Loss Sensitive Business | Standard & Poor's, AA Rating |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 101 |  | 106 |  |  |
Receivables for Loss Sensitive Business | Standard & Poor's, A Rating [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 43 |  | 38 |  |  |
Receivables for Loss Sensitive Business | Standard & Poor's, BBB Rating |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 127 |  | 119 |  |  |
Receivables for Loss Sensitive Business | Standard & Poor's, BB Rating |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 60 |  | 56 |  |  |
Receivables for Loss Sensitive Business | Standard & Poor's, Below BB Rating |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | $ 40 |  | $ 41 |  |  |

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