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Reinsurance - Reinsurance Recoverables (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Ceded Credit Risk [Line Items] |  |
Net reinsurance recoverables | $ 4,061 | $ 3,659
Corporate |  |
Ceded Credit Risk [Line Items] |  |
Net reinsurance recoverables | 349 | 366
Property and Casualty Insurance Products | Operating Segments |  |
Ceded Credit Risk [Line Items] |  |
Paid loss and loss adjustment expenses | 84 | 89
Unpaid loss and loss adjustment expenses [1] | 3,496 | 3,161
Gross reinsurance recoverables | 3,580 | 3,250
Allowance for uncollectible reinsurance | (104) | (165)
Net reinsurance recoverables | 3,476 | 3,085
Property and Casualty Insurance Products | Commercial Lines | Operating Segments |  |
Ceded Credit Risk [Line Items] |  |
Net reinsurance recoverables | 688 | 712
Group Benefits | Operating Segments |  |
Ceded Credit Risk [Line Items] |  |
Net reinsurance recoverables | $ 236 | $ 208

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of valuation allowance for reinsurance recoverables. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References No definition available. + Details
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- Definition Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References No definition available. + Details
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