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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, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Workers’ compensation |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | $ (50) | $ (73) |  |
Workers’ compensation discount accretion |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 17 | 20 |  |
General liability |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 43 | 28 |  |
Marine |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 10 | 0 |  |
Package business |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | (9) | (7) |  |
Professional liability |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 33 | 8 |  |
Bond |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 0 | 0 |  |
Assumed Reinsurance |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 3 | 0 |  |
Net asbestos reserves |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 0 | 0 |  |
Net environmental reserves |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 0 | 0 |  |
Catastrophes |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | (22) | (34) |  |
Uncollectible reinsurance |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 0 | 11 |  |
Other reserve re-estimates, net |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 16 | 3 |  |
Property and Casualty, Commercial Insurance Product Line [Member] | Property |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | (15) | (12) |  |
Property and Casualty, Commercial Insurance Product Line [Member] | Automobile |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 2 | (10) |  |
Property and Casualty, Personal Insurance Product Line [Member] | Property |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 1 | (13) |  |
Property and Casualty, Personal Insurance Product Line [Member] | Automobile |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | (5) | 0 |  |
Property, Liability and Casualty Insurance Product Line |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development | 24 | (79) |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 5,125 | 3,772 | $ 4,232 | $ 3,957
Liability for Unpaid Claims and Claims Adjustment Expense, Net | $ 22,623 | 19,859 | $ 20,352 | $ 19,818
Scenario, Adjustment [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments |  | 90 |  |
Scenario, Adjustment [Member] | Catastrophes |  |  |  |
Product Information [Line Items] |  |  |  |
Prior accident year development |  | 123 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net |  | $ 850 |  |

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