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Business Acquisitions - Estimated Pre-tax Amortization Expense (Details) - The Navigators Group, Inc. [Member] $ in Millions	Jun. 30, 2019 USD ($)
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$ 11
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	22
Finite-Lived Intangible Assets, Amortization Expense, Year Two	22
Finite-Lived Intangible Assets, Amortization Expense, Year Three	22
Finite-Lived Intangible Assets, Amortization Expense, Year Four	22
Contractual Rights [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	84
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	47
Finite-Lived Intangible Assets, Amortization Expense, Year Two	21
Finite-Lived Intangible Assets, Amortization Expense, Year Three	9
Finite-Lived Intangible Assets, Amortization Expense, Year Four	$ 0

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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