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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, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | 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 |  |  | $ 12 | $ 15 | $ 27 |
Group Insurance Policies |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Prior accident year development |  |  | (324) | (185) | (162) |
Reinsurance and Other Recoverables | $ 239 | $ 209 | 239 | 209 | 208 | $ 218
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 8,206 | 8,303 | 8,206 | $ 8,303 | $ 5,564 | $ 5,671
Scenario, Adjustment [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Reinsurance and Other Recoverables | 90 |  | $ 90 |  |  |
Minimum | Group Insurance Policies |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Range of discount rates |  |  | 2.10% | 2.10% | 3.00% |
Maximum | Group Insurance Policies |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Range of discount rates |  |  | 8.00% | 8.00% | 8.00% |
Property and Casualty Insurance Products |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Reinsurance and Other Recoverables | 4,232 |  | $ 4,232 |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 20,352 |  | $ 20,352 |  |  |
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% |
Catastrophes |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Prior accident year development |  |  | $ (49) | $ (16) | $ (7) |
Catastrophes | Scenario, Adjustment [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Prior accident year development |  |  | 133 |  |  |
Catastrophes | Scenario, Plan [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 850 |  | 850 |  |  |
Asbestos and Environmental |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Adverse development from comprehensive annual review | 238 | $ 285 |  |  |  |
Reinsurance recoverable during period | 238 |  |  | 285 |  |
Reinsurance and Other Recoverables | 1,032 |  | 1,032 |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 1,254 |  | 1,254 |  |  |
Group long-term disability | Group Insurance Policies |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Prior accident year development |  |  | 230 | 125 | 90 |
Reinsurance and Other Recoverables | 235 |  | 235 |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 6,767 |  | 6,767 |  |  |
Group life and accident, excluding premium waiver | Group Insurance Policies |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Prior accident year development |  |  | 90 | $ 60 | $ 75 |
Reinsurance and Other Recoverables | 2 |  | 2 |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | $ 575 |  | $ 575 |  |  |

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