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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Premiums Receivable, Gross	$ 4,756		$ 4,420
ACL	(134)	$ (144)	(152)	$ (183)	$ (139)	$ (145)
Premiums receivable and agents' balances, net of ACL	4,622		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	4,228		3,851
ACL	(97)	(108)	(117)	(139)	(98)	(85)
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums
Financing Receivable, Credit Quality Indicator [Line Items]
Premiums Receivable, Gross	528		569
ACL	(37)	$ (36)	(35)	$ (44)	$ (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	139		142
Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | A
Financing Receivable, Credit Quality Indicator [Line Items]
Premiums Receivable, Gross	56		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	163		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	105		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	$ 65		$ 65

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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))
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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-URI http://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
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-Section 50
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-URI http://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
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-URI http://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
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-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524

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The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 944
-SubTopic 210
-Section S99
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Gross amount, as of the balance sheet date, due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, before deducting the allowance for doubtful accounts.

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