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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 | 9 Months Ended | 12 Months Ended | 16 Months Ended | 45 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2016 | Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance Recoverables, Gross |  | $ 5,777 |  |  | $ 5,777 | $ 5,777 | $ 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 |  |  |  |  | 204 |  |
Reinsurance Recoverables, Gross |  | 204 |  |  | 204 | 204 |
Prior accident year development [1] |  |  |  |  | 304 |  |
Change in Deferred Gain on Retroactive Reinsurance |  | 113 |  |  | 113 | 113 |
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 |  | 96 |  |  |  |  |
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] |  | 112 | $ 62 |  |  |  |
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] |  | $ 129 |  |  |  |  |

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