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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | $ 4,631 | $ 4,420 |  |
ACL | (144) | (152) | $ (139) | $ (145)
Premiums receivable and agents' balances, net of ACL | 4,487 | 4,268 |  |
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 4,058 | 3,851 |  |
ACL | (108) | (117) | (98) | (85)
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 573 | 569 |  |
ACL | (36) | (35) | $ (41) | $ (60)
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | Standard & Poor's, AAA Rating [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | Standard & Poor's, AA Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 140 | 142 |  |
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | A |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 65 | 62 |  |
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | Standard & Poor's, BBB Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 186 | 185 |  |
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | Standard & Poor's, BB Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | 115 | 115 |  |
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | Standard & Poor's, Below BB Rating |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Premiums Receivable, Gross | $ 67 | $ 65 |  |

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