Supplementary Information - Average Annual Percentage Payout of Incurred Claims by Age (Details)	Dec. 31, 2018
Insurance [Abstract]
Short-duration insurance contracts, historical claims duration, year one	30.20%
Short-duration insurance contracts, historical claims duration, year two	19.90%
Short-duration insurance contracts, historical claims duration, year three	17.30%
Short-duration insurance contracts, historical claims duration, year four	15.40%
Short-duration insurance contracts, historical claims duration, year five	8.60%
Short-duration insurance contracts, historical claims duration, year six	2.90%
Short-duration insurance contracts, historical claims duration, year seven	1.80%
Short-duration insurance contracts, historical claims duration, year eight	0.70%
Short-duration insurance contracts, historical claims duration, year nine	0.30%
Short-duration insurance contracts, historical claims duration, year ten	0.30%

No definition available.

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- Definition

Percentage of average annual payout, after reinsurance, in the eighth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 4G
-URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671329-158438

+ Details

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- Definition

Percentage of average annual payout, after reinsurance, in the fifth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the fourth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the ninth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the first year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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- Definition

Percentage of average annual payout, after reinsurance, in the seventh year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the sixth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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- Definition

Percentage of average annual payout, after reinsurance, in the tenth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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- Definition

Percentage of average annual payout, after reinsurance, in the third year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the second year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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