F&G Reinsurance - Narrative (Details)				3 Months Ended	4 Months Ended	9 Months Ended
	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2018	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 01, 2020 USD ($)
Ceded Credit Risk [Line Items]
Expected credit losses on reinsurance recoverable				$ 22,000,000	$ 22,000,000	$ 22,000,000	$ 0
Number of policies reinsured by foreign company not engaged in insurance						0
Hannover Re
Ceded Credit Risk [Line Items]
Reinsurance risk charge fee				$ 5,000,000	$ 7,000,000
Hannover Re | Minimum
Ceded Credit Risk [Line Items]
Recapture period			8 years
Hannover Re | Maximum
Ceded Credit Risk [Line Items]
Recapture period			12 years
Kubera Reassurance Company
Ceded Credit Risk [Line Items]
Net amount recoverable						$ 821,000,000
Wilton Reassurance Company
Ceded Credit Risk [Line Items]
Net amount recoverable						$ 1,468,000,000
Life and Annuity Insurance Product Line | Kubera Reassurance Company
Ceded Credit Risk [Line Items]
Reinsurance retention policy, amount retained	$ 185,000,000	$ 758,000,000
Fixed indexed annuities
Ceded Credit Risk [Line Items]
Reinsurance retention policy, amount retained	$ 1,000,000,000.0
Fixed indexed annuities | Kubera Reassurance Company
Ceded Credit Risk [Line Items]
Reinsurance retention policy, amount retained		$ 4,000,000,000.0