Consolidated Statements of Operations and Comprehensive Income (Parentheticals) (Unaudited) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Liability for Future Policy Benefit, Remeasurement Gain (Loss)	$ 1	$ (5)

Amount of remeasurement gain (loss) on liability for future policy benefit from application of revised benefit ratio as of contract issue. Includes, but is not limited to, remeasurement gain (loss) for annuitization insurance benefit, death and other insurance benefits, and traditional and limited-payment contracts.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 45
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=124509262&loc=SL117780257-158436

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124509262&loc=d3e14722-158436

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124509262&loc=d3e14714-158436

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