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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Change in deferred gain on retroactive reinsurance included in other liabilities [1] | $ 29 | $ 0
Camp Wildfire [Member] |  |
Gain Contingencies [Line Items] |  |
Salvage and Subrogation Recoveries, Value | 57 |
Unrecorded estimated litigation settlement, amount due to reinsurer | 57 |
Per occurrence retention [Member] | Camp Wildfire [Member] |  |
Gain Contingencies [Line Items] |  |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | 12 |
Reinsurance Retention Policy, Amount Retained | 350 |
Aggregate excess of loss treaty [Member] | Camp Wildfire [Member] |  |
Gain Contingencies [Line Items] |  |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | 45 |
Reinsurance Retention Policy, Amount Retained | 825 |
PG&E [Member] | Portion of Expected Class Settlement Due to HIG [Member] | Minimum |  |
Gain Contingencies [Line Items] |  |
Gain Contingency, Unrecorded Amount | 300 |
PG&E [Member] | Portion of Expected Class Settlement Due to HIG [Member] | Maximum |  |
Gain Contingencies [Line Items] |  |
Gain Contingency, Unrecorded Amount | 325 |
Workers’ compensation |  |
Prior accident year development [1] | (17) | (20)
Workers’ compensation discount accretion |  |
Prior accident year development [1] | 9 | 8
General Liability [Member] |  |
Prior accident year development [1] | 12 | 6
Marine |  |
Prior accident year development [1] | 0 | 0
Package business |  |
Prior accident year development [1] | 1 | 5
Property |  |
Prior accident year development [1] | (2) | 1
Property | Property and Casualty, Commercial Insurance [Member] |  |
Prior accident year development [1] | (7) | (2)
Professional liability |  |
Prior accident year development [1] | 1 | 0
Bond |  |
Prior accident year development [1] | 0 | 0
Assumed reinsurance |  |
Prior accident year development [1] | 0 | 0
Automobile | Property and Casualty, Commercial Insurance [Member] |  |
Prior accident year development [1] | 5 | 0
Automobile | Property and Casualty, Personal Insurance [Member] |  |
Prior accident year development [1] | (6) | (5)
Net asbestos reserves |  |
Prior accident year development [1] | 0 | 0
Net environmental reserves |  |
Prior accident year development [1] | 0 | 0
Catastrophes [Member] |  |
Prior accident year development [1] | (13) | (8)
Uncollectible reinsurance |  |
Prior accident year development [1] | 0 | 0
Other reserve re-estimates, net |  |
Prior accident year development [1] | 11 | 4
Property, Liability and Casualty Insurance Product Line |  |
Prior accident year development [1] | 23 | (11)
Prior accident year development before change in deferred gain | $ (6) | $ (11)

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99380617&loc=SL75241803-196195 + Details
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- Definition The estimated amount as of the balance sheet date to be received by an insurer from the sale of property (usually damaged) on which the insurer has paid a total claim to the insured and has obtained title to the property and the right of an insurer to pursue any course of recovery of damages, in its name or in the name of the policyholder, against a third party who is liable for costs relating to an insured event that have been paid by the insurer. Estimated salvage and subrogation is generally deducted from the liability for unpaid claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 30 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6482241&loc=d3e13783-158432 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 30 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6482241&loc=d3e13779-158432 + Details
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