Investments (Other Invested Assets - Narrative) (Details)	Jun. 30, 2020
Minimum
Derivative [Line Items]
Percentage of other invested assets comprised of freestanding derivatives with positive estimated fair values	90.00%

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.

No definition available.

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