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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Property, Liability and Casualty Insurance Product Line |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Reinsurance and other recoverables | $ 5,083 | $ 5,083 | $ 3,780 | $ 4,232 | $ 3,957
Prior accident year development |  | (23) | (139) |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | $ 22,814 | 22,814 | 20,017 | $ 20,352 | $ 19,818
Property, Liability and Casualty Insurance Product Line | Scenario, Adjustment [Member] |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Reinsurance and other recoverables |  |  | 90 |  |
Property, Liability and Casualty Insurance Product Line | Workers’ compensation |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | (90) | (97) |  |
Property, Liability and Casualty Insurance Product Line | Workers’ compensation discount accretion |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | 25 | 30 |  |
Property, Liability and Casualty Insurance Product Line | General liability |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | 62 | 32 |  |
Property, Liability and Casualty Insurance Product Line | Marine |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | 8 | 0 |  |
Property, Liability and Casualty Insurance Product Line | Package business |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | (32) | (16) |  |
Property, Liability and Casualty Insurance Product Line | Professional liability |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | 32 | (12) |  |
Property, Liability and Casualty Insurance Product Line | Bond |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | (2) | 0 |  |
Property, Liability and Casualty Insurance Product Line | Assumed Reinsurance |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | 3 | 0 |  |
Property, Liability and Casualty Insurance Product Line | Net asbestos reserves |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | 0 | 0 |  |
Property, Liability and Casualty Insurance Product Line | Net environmental reserves |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | 0 | 0 |  |
Property, Liability and Casualty Insurance Product Line | Catastrophes |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | (27) | (47) |  |
Property, Liability and Casualty Insurance Product Line | Catastrophes | Scenario, Adjustment [Member] |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  |  | 133 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net |  |  | 850 |  |
Property, Liability and Casualty Insurance Product Line | Uncollectible reinsurance |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | 0 | 22 |  |
Property, Liability and Casualty Insurance Product Line | Other reserve re-estimates, net |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | 15 | 4 |  |
Property and Casualty, Commercial Insurance [Member] | Property |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | (16) | (10) |  |
Property and Casualty, Commercial Insurance [Member] | Automobile |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | 27 | (15) |  |
Property and Casualty, Personal Insurance [Member] | Property |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | 0 | (20) |  |
Property and Casualty, Personal Insurance [Member] | Automobile |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Prior accident year development |  | (28) | $ (10) |  |
PG&E [Member] |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |
Percentage of Insurance Subrogation Claims Covered in Settlement | 85.00% |  |  |  |
Reinsurance Recoverable, Guarantee Benefit | $ 116 | 116 |  |  |
PG&E [Member] | Expected Settlement for All Consenting Creditors [Member] |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |
Gain Contingency, Unrecorded Amount | 11,000 | 11,000 |  |  |
PG&E [Member] | Portion of Expected Class Settlement Due to HIG [Member] |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |
Gain Contingency, Unrecorded Amount | 325 | 325 |  |  |
PG&E [Member] | Portion of Expected Class Settlement Due to Reinsurer [Member] |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |
Gain Contingency, Unrecorded Amount | $ 116 | $ 116 |  |  |

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