Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Fair Value Disclosures [Abstract]
Transfers into Level 3 at end of reporting period, net (losses) gains not included in realized and unrealized gains and losses related to Level 3 for the period	$ 17	$ 4
Transfers out Level 3 at end of reporting period, net (losses) gains included in realized and unrealized gains and losses related to Level 3 for the period.	$ (12)	$ 14

Net gains or losses for the period (realized and unrealized) related to assets and liabilities transferred into Level 3 at fair value at the end of the reporting period and are therefore not reflected in realized and unrealized gains and losses related to Level 3 for the period.

No definition available.

Name:	crbg_FairValueLevel3TransfersInAtEndOfPeriodNetGainLossExcludedFromLevel3GainsLosses
Namespace Prefix:	crbg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration