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Related Party Transactions (Details) - USD ($) $ in Millions		7 Months Ended	12 Months Ended
	Dec. 01, 2024	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024
Related Party Transaction [Line Items]
Cash and cash equivalents			$ 11,330	$ 3,192
AEILIC | Freestone Re Ltd. (Freestone)
Related Party Transaction [Line Items]
Reinsurance agreement, quota share, fixed indexed and payout annuities, percentage	50.00%
Reinsurance agreement, quota share, fixed rate and fixed indexed annuities, percentage	70.00%
American National Insurance Company (ANICO) | Freestone Re Ltd. (Freestone)
Related Party Transaction [Line Items]
Reinsurance agreement, ceded risk, in-force and future flow business					80.00%
Reinsurance agreement, ceded risk, in-force and future flow single premium immediate annuity business					70.00%
Reinsurance agreement, ceded risk, fixed deferred and equity-Indexed annuity business, issued					100.00%
Reinsurance agreement, ceded risk, fixed deferred and equity-indexed annuity business					70.00%
Related Party
Related Party Transaction [Line Items]
Payments to acquire investments			$ 4,700	4,000
Related Party | North End Re
Related Party Transaction [Line Items]
Reinsurance, modified coinsurance basis			70.00%
Reinsurance, coinsurance basis			30.00%
Related Party | Brookfield Treasury Management Inc
Related Party Transaction [Line Items]
Investment income, interest			$ 15	3
Related Party | Investment Management Fees
Related Party Transaction [Line Items]
Related party agreements and transactions		$ 24	112	43
Related Party | ANAT and BAMR US Holdings LLC Deposit Agreement
Related Party Transaction [Line Items]
Cash and cash equivalents			272	294
Related Party | ANTAC, LLC and BAMR US Holdings LLC Deposit Agreement
Related Party Transaction [Line Items]
Cash and cash equivalents			192	181
Related Party | Brookfield Treasury Management Inc
Related Party Transaction [Line Items]
Cash and cash equivalents			$ 254	$ 250

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