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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Premiums Receivable, Gross | $ 4,420 | $ 4,529
Premium Receivable, Allowance for Credit Loss | (152) | (145)
Premiums Receivable, Net | 4,268 | 4,384
Premiums Receivable, Due in One Year or Less, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Premiums Receivable, Gross | 3,851 |
Premium Receivable, Allowance for Credit Loss | (117) | (85)
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Premiums Receivable, Gross | 569 |
Premium Receivable, Allowance for Credit Loss | (35) | $ (60)
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, AAA Rating [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Premiums Receivable, Gross | 0 |
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, AA Rating |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Premiums Receivable, Gross | 142 |
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | A |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Premiums Receivable, Gross | 62 |
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, BBB Rating |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Premiums Receivable, Gross | 185 |
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, BB Rating |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Premiums Receivable, Gross | 115 |
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, Below BB Rating |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Premiums Receivable, Gross | $ 65 |

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