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Premiums Receivable - Rollforward of Premiums Receivable and Agents' Balances (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Premium Receivable, Allowance for Credit Loss | $ (105) | $ (152) | $ (145)
Premium Receivable, Credit Loss Expense (Reversal) | 51 | 4 | 74
Premium Receivable, Allowance for Credit Loss, Writeoff | 57 | 59 | 49
Premium Receivable, Allowance for Credit Loss, Recovery | (10) | (8) | (5)
Premium Receivable, Allowance for Credit Loss | (109) | (105) | (152)
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Premium Receivable, Allowance for Credit Loss |  |  | (122)
Premiums Receivable, Due in One Year or Less, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Premium Receivable, Allowance for Credit Loss | (83) | (117) | (85)
Premium Receivable, Credit Loss Expense (Reversal) | 48 | 17 | 78
Premium Receivable, Allowance for Credit Loss, Writeoff | 56 | 59 | 49
Premium Receivable, Allowance for Credit Loss, Recovery | (10) | (8) | (5)
Premium Receivable, Allowance for Credit Loss | (85) | (83) | (117)
Premiums Receivable, Due in One Year or Less, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Premium Receivable, Allowance for Credit Loss |  |  | (83)
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Premium Receivable, Allowance for Credit Loss | (22) | (35) | (60)
Premium Receivable, Credit Loss Expense (Reversal) | 3 | (13) | (4)
Premium Receivable, Allowance for Credit Loss, Writeoff | 1 | 0 | 0
Premium Receivable, Allowance for Credit Loss, Recovery | 0 | 0 | 0
Premium Receivable, Allowance for Credit Loss | $ (24) | $ (22) | (35)
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Premium Receivable, Allowance for Credit Loss |  |  | (39)
Premiums Receivable [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Premium Receivable, Allowance for Credit Loss |  |  | 23
Premiums Receivable [Member] | Accounting Standards Update 2016-13 [Member] | Premiums Receivable, Due in One Year or Less, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Premium Receivable, Allowance for Credit Loss |  |  | 2
Premiums Receivable [Member] | Accounting Standards Update 2016-13 [Member] | Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Premium Receivable, Allowance for Credit Loss |  |  | $ 21

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- Definition Amount of expense (reversal of expense) for expected credit loss on premium receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 + Details
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- Definition Amount of writeoff of premium receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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