Reinsurance (Components of Reinsurance Receivables) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reinsurance receivables related to insurance reserves
Ceded claim and claim adjustment expenses	$ 4,019	$ 3,934	$ 4,094	$ 4,087
Ceded future policy benefits	233	230
Reinsurance receivables related to paid losses	203	126
Reinsurance receivables	4,455	4,290
Allowance for uncollectible reinsurance	(29)	(29)
Reinsurance receivables, net of allowance for uncollectible reinsurance	$ 4,426	$ 4,261

Ceded Claim And Claim Adjustment Expenses

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- Definition

Ceded Future Policy Benefits

+ References

No definition available.

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- References

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 310
-Section 45
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-URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489

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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.

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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.

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- Definition

Amount before valuation allowance of reinsurance recoverables on paid losses.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489

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-URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387

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