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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Premiums Receivable, Gross | $ 4,624 |  | $ 4,529
ACL | (174) | $ (183) | (145)
Premiums receivable and agents' balances, net of ACL | 4,450 |  | 4,384
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Premiums Receivable, Gross | 4,027 |  |
ACL | (130) | (139) | (85)
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Premiums Receivable, Gross | 597 |  |
ACL | (44) | $ (44) | $ (60)
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | AAA |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Premiums Receivable, Gross | 0 |  |
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | AA |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Premiums Receivable, Gross | 139 |  |
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | A |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Premiums Receivable, Gross | 52 |  |
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | BBB |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Premiums Receivable, Gross | 226 |  |
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | BB |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Premiums Receivable, Gross | 103 |  |
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | Below BB |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Premiums Receivable, Gross | $ 77 |  |

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