Business, Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	6 Months Ended	9 Months Ended
	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($) Segment	May 25, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 01, 2021 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of segments | Segment		5
Deferred Sale Inducement Cost		$ 146		$ 133
Finite-Lived Intangible Assets [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating		213,933		210,597	$ 211,737
Separate account liabilities		135,624		146,038
Separate account assets		135,624		146,038
Global Atlantic Financial Group
Finite-Lived Intangible Assets [Line Items]
Separate account liabilities			$ 16,400
Separate account assets			$ 5,200
Global Atlantic Financial Group | Forecast
Finite-Lived Intangible Assets [Line Items]
Ceding Commissions, Before Tax	$ 2,300
U.S.
Finite-Lived Intangible Assets [Line Items]
Separate account assets		$ 52,793		$ 61,030
Other balance sheet reclassifications upon adoption of the LDTI standard
Finite-Lived Intangible Assets [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating					$ 7,519
Minimum | VODA and VOCRA
Finite-Lived Intangible Assets [Line Items]
Amortization period		9 years
Maximum | VODA and VOCRA
Finite-Lived Intangible Assets [Line Items]
Amortization period		40 years