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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, 2020 | Jun. 30, 2019
Increase (Decrease) in Deferred Revenue | $ 83 | $ 0
Accident and Health Insurance Product Line [Member] |  |
Prior accident year development [1] | (38) | (50)
Change in Workers Compensation Discount Including Accretion [Member] |  |
Prior accident year development [1] | 18 | 17
General Liability [Member] |  |
Prior accident year development [1] | 114 | 43
Marine |  |
Prior accident year development [1] | 1 | 10
Package Business [Member] |  |
Prior accident year development [1] | (6) | (9)
Property Insurance [Member] | Property and Casualty, Commercial Insurance [Member] |  |
Prior accident year development [1] | (2) | (15)
Property Insurance [Member] | Property and Casualty, Personal Insurance [Member] |  |
Prior accident year development [1] | 0 | 1
Professional Liability Insurance [Member] |  |
Prior accident year development [1] | 5 | 33
Surety Product Line [Member] |  |
Prior accident year development [1] | (10) | 0
Assumed reinsurance |  |
Prior accident year development [1] | (7) | 3
Automobiles [Member] | Property and Casualty, Commercial Insurance [Member] |  |
Prior accident year development [1] | 27 | 2
Automobiles [Member] | Property and Casualty, Personal Insurance [Member] |  |
Prior accident year development [1] | (21) | (5)
Catastrophes [Member] |  |
Prior accident year development [1] | (413) | (22)
Uncollectible reinsurance |  |
Prior accident year development [1] | (2) | 0
Insurance, Other [Member] |  |
Prior accident year development [1] | 6 | 16
Property, Liability and Casualty Insurance Product Line |  |
Prior accident year development [1] | (245) | 24
Prior accident year development before change in deferred gain | $ (328) | $ 24

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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=121586364&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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