Reinsurance and Policy Provisions (Hannover Financing Arrangements) (Details) - 2019 Hannover Reinsurance Agreement $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Ceded Credit Risk [Line Items]
Lifetime income benefit rider payments in excess of policy fund values and waived surrender charges related to penalty free withdrawals on certain business, percentage	80.00%
Risk charges	$ 33.1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 825
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479383/944-825-50-1B

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration