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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | $ 5,098 |  | $ 4,550 |  |  |
ACL | (108) | $ (107) | (105) | $ (124) | $ (134) | $ (152)
Premiums receivable and agents' balances, net of ACL | 4,990 |  | 4,445 |  |  |
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 | 4,690 |  | 4,130 |  |  |
ACL | (85) | (84) | (83) | (87) | (97) | (117)
Receivables for Loss Sensitive Business |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 408 |  | 420 |  |  |
ACL | (23) | $ (23) | (22) | $ (37) | $ (37) | $ (35)
Receivables for Loss Sensitive Business | Standard & Poor's, AA Rating |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 124 |  | 130 |  |  |
Receivables for Loss Sensitive Business | Standard & Poor's, A Rating [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 38 |  | 52 |  |  |
Receivables for Loss Sensitive Business | Standard & Poor's, BBB Rating |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 126 |  | 133 |  |  |
Receivables for Loss Sensitive Business | Standard & Poor's, BB Rating |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 77 |  | 64 |  |  |
Receivables for Loss Sensitive Business | Standard & Poor's, Below BB Rating |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | $ 43 |  | $ 41 |  |  |

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