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Reserve for Property and Liability Insurance Claims and Claims Expense - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Increase (decrease) in claims and claims expense |  |  |
Reserves for asbestos claims | $ 856 |  | $ 884
Reinsurance recoverables for asbestos claims | 392 |  | 412
Reserves for environmental claims | 159 |  | 166
Reinsurance recoverables for environmental claims | 36 |  | $ 33
Prior years claims and claims adjust expense, favorable (unfavorable) | 192 |  |
Auto |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years claims and claims adjust expense, favorable (unfavorable) | 225 |  |
Catastrophe |  |  |
Increase (decrease) in claims and claims expense |  |  |
Total incurred | 1,270 | $ 1,750 |
Prior years claims and claims adjust expense, favorable (unfavorable) | (44) |  |
Reserve Adjustments | Other personal lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years claims and claims adjust expense, favorable (unfavorable) | (33) |  |
Catastrophe Loss Re-estimates |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years claims and claims adjust expense, favorable (unfavorable) | (44) |  |
Non Catastrophe Reestimates | Auto |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years claims and claims adjust expense, favorable (unfavorable) | 34 |  |
Non Catastrophe Reestimates | Homeowners |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years claims and claims adjust expense, favorable (unfavorable) | (78) |  |
Hurricane | Homeowners |  |  |
Increase (decrease) in claims and claims expense |  |  |
Prior years claims and claims adjust expense, favorable (unfavorable) | $ (37) |  |

X
- Definition Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos, net of estimated reinsurance recoveries. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to environmental claims, net of estimated reinsurance recoveries. + References No definition available. + Details
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- Definition The known and estimated amount recoverable related to asbestos claims as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance. + References No definition available. + Details
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- Definition The known and estimated amount recoverable related to environment related claims as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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