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Reinsurance - Reinsurance Recoverables (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Ceded Credit Risk [Line Items]
Net reinsurance recoverables	$ 4,357	$ 4,061
Corporate
Ceded Credit Risk [Line Items]
Net reinsurance recoverables	332	349
Property and Casualty Insurance Products | Operating Segments
Ceded Credit Risk [Line Items]
Paid loss and loss adjustment expenses	127	84
Unpaid loss and loss adjustment expenses	3,773	3,496
Gross reinsurance recoverables	3,900	3,580
Allowance for uncollectible reinsurance	(126)	(104)
Net reinsurance recoverables	3,774	3,476
Group Benefits | Operating Segments
Ceded Credit Risk [Line Items]
Net reinsurance recoverables	$ 251	$ 236

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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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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.

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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.

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Amount before valuation allowance of reinsurance recoverables on paid losses.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-SubTopic 310
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Amount before valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, and for amounts expected based upon statistical projections and other measures of incurred losses and loss settlement expenses which have not yet been reported to the ceding insurer.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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