Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Basis of Presentation and Nature of Business - Narrative (Details) - USD ($)	Nov. 30, 2017	Sep. 30, 2018	Dec. 31, 2017	May 24, 2017
Effects of Reinsurance [Line Items]
Debt Assumed Through Acquisition	$ 405
Goodwill		$ 467,000,000	$ 467,000,000
FGL
Effects of Reinsurance [Line Items]
Acquisition share price (in USD per share)				$ 31.10
Business Combination, Consideration Transferred	2,000,000,000
Front Street Re Ltd
Effects of Reinsurance [Line Items]
Business Combination, Consideration Transferred	$ 0