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Reserve for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Current accident year benefit from discounting property and casualty reserves |  | $ 15 | $ 27 | $ 35
Property and Casualty Insurance Products |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior accident year development |  | $ (41) | $ 457 | $ 250
Property and Casualty Insurance Products | Minimum |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Range of discount rates |  | 1.77% | 1.77% | 1.77%
Property and Casualty Insurance Products | Maximum |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Range of discount rates |  | 14.15% | 14.15% | 14.15%
Asbestos and Environmental |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Adverse development from comprehensive annual review | $ 285 | $ 285 |  |
Reinsurance recoverable during period |  | 285 |  |
Group Insurance Policies |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior accident year development |  | $ (185) | $ (162) | $ (146)
Group Insurance Policies | Minimum |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Range of discount rates |  | 2.10% | 3.00% | 3.00%
Group Insurance Policies | Maximum |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Range of discount rates |  | 8.00% | 8.00% | 8.00%
Group Insurance Policies | Group long-term disability |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior accident year development |  | $ (125) | $ 90 | $ 90
Group Insurance Policies | Group life and accident, excluding premium waiver |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior accident year development |  | $ 60 | $ 75 | $ 50

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