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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Segment Reconciling Items |  |
Increase (Decrease) in Deferred Revenue | $ 45 | $ 83
Segment Reconciling Items | Catastrophe |  |
Prior accident year development [1] | (98) | (413)
Accident and Health Insurance Product Line [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | (83) | (38)
Change in Workers Compensation Discount Including Accretion [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | 18 | 18
General Liability [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | 307 | 114
Marine | Segment Reconciling Items |  |
Prior accident year development [1] | 1 | 1
Package Business [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | (46) | (6)
Property Insurance [Member] | Commercial Lines | Segment Reconciling Items |  |
Prior accident year development [1] | (20) | (2)
Property Insurance [Member] | Personal Lines | Segment Reconciling Items |  |
Prior accident year development [1] | 1 | 0
Professional Liability Insurance [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | (7) | 5
Surety Product Line [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | (14) | (10)
Assumed reinsurance | Segment Reconciling Items |  |
Prior accident year development [1] | 0 | (7)
Automobiles [Member] | Commercial Lines | Segment Reconciling Items |  |
Prior accident year development [1] | 0 | 27
Automobiles [Member] | Personal Lines | Segment Reconciling Items |  |
Prior accident year development [1] | (43) | (21)
Uncollectible reinsurance | Segment Reconciling Items |  |
Prior accident year development [1] | (10) | (2)
Insurance, Other [Member] | Segment Reconciling Items |  |
Prior accident year development [1] | 29 | 6
Property, Liability and Casualty Insurance Product Line |  |
Prior accident year development [1] | 80 | (245)
Prior accident year development before change in deferred gain | $ 35 | $ (328)

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- Definition Prior Year Claims and Claims Adjustment Expense, net of retroactive reinsurance benefit + References No definition available. + Details
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- Definition Amount of increase (decrease) in deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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