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Related Party Transactions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Cash and cash equivalents	$ 13,895		$ 13,895		$ 3,192
Investment Management Fees
Related Party Transaction [Line Items]
Related party agreements and transactions				$ 20
Related Party
Related Party Transaction [Line Items]
Payments to acquire investments			$ 1,200		4,000
Related Party | North End Re (Cayman) SPC
Related Party Transaction [Line Items]
Modified coinsurance basis	70.00%		70.00%
Coinsurance basis	30.00%		30.00%
Related Party | Brookfield Treasury Management Inc
Related Party Transaction [Line Items]
Cash and cash equivalents	$ 250		$ 250
Interest income	2		2
Related Party | Investment Management Fees
Related Party Transaction [Line Items]
Related party agreements and transactions	32	$ 10	45
Related Party | ANAT and BAMR US Holdings LLC Deposit Agreement
Related Party Transaction [Line Items]
Cash and cash equivalents	284		284		294
Related Party | ANTAC, LLC and BAMR US Holdings LLC Deposit Agreement
Related Party Transaction [Line Items]
Cash and cash equivalents	$ 186		$ 186		$ 181

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