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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | $ 6,451 |  | $ 5,716 |  |  |
ACL | (116) | $ (111) | (109) | $ (119) | $ (111) | $ (109)
Premiums receivable and agents' balances, net of ACL | 6,335 |  | 5,607 |  |  |
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 | 6,025 |  | 5,303 |  |  |
ACL | (95) | (91) | (89) | (94) | (86) | (85)
Receivables for Loss Sensitive Business |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 426 |  | 413 |  |  |
ACL | (21) | $ (20) | (20) | $ (25) | $ (25) | $ (24)
Receivables for Loss Sensitive Business | Standard & Poor's, AA Rating |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 91 |  | 94 |  |  |
Receivables for Loss Sensitive Business | Standard & Poor's, A Rating [Member] |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 59 |  | 54 |  |  |
Receivables for Loss Sensitive Business | Standard & Poor's, BBB Rating |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 140 |  | 136 |  |  |
Receivables for Loss Sensitive Business | Standard & Poor's, BB Rating |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | 91 |  | 84 |  |  |
Receivables for Loss Sensitive Business | Standard & Poor's, Below BB Rating |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Premiums Receivable, Gross | $ 45 |  | $ 45 |  |  |

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