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v3.20.2

Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended | 13 Months Ended | 42 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2016 | Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance Recoverables, Gross |  | $ 5,751 |  |  | $ 5,751 | $ 5,751 | $ 5,641
Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Payments for Reinsurance | $ 91 |  |  |  |  |  |
Policyholder Benefits and Claims Incurred, Assumed |  |  |  |  | 190 |  |
Reinsurance Recoverables, Gross |  | 190 |  |  | 190 | 190 |
Prior accident year development [1] |  |  |  |  | 290 |  |
Change in Deferred Gain on Retroactive Reinsurance |  | 99 |  |  | 99 | 99 |
Adverse Development Cover Navigators Group [Member] | Remaining [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Maximum adverse loss development to be ceded under agreement |  | 110 |  |  |  |  |
Adverse Development Cover Navigators Group [Member] | Retention Layer for Reserve for the Covered Liabilities as of the Inception Date [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  | 1,816 |  |  |  |  |
Adverse Development Cover Navigators Group [Member] | Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  | 100 |  |  |  |  |
General Liability [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Prior accident year development [1] |  | 114 | $ 43 |  |  |  |
Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Payments for Reinsurance |  |  |  | $ 650 |  |  |
Maximum adverse loss development to be ceded under agreement |  | 860 |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  |  |  | $ 1,700 |  |  |
Policyholder Benefits and Claims Incurred, Assumed |  |  |  |  |  | 640 |
Asbestos and Environmental | Remaining [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Maximum adverse loss development to be ceded under agreement |  | 860 |  |  |  |  |
Maximum | Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Maximum adverse loss development to be ceded under agreement |  | 300 |  |  |  |  |
Maximum | Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Maximum adverse loss development to be ceded under agreement |  | 1,500 |  |  |  |  |
PG&E [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Former Gain Contingency, Recognized in Current Period |  | 289 |  |  | $ 289 | $ 289 |
Abuse Claims [Member] | General Liability [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Prior accident year development [1] |  | $ 102 |  |  |  |  |

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