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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Related Party Transaction [Line Items]
Total investments	$ 95,451		$ 95,451		$ 90,516
Cash and cash equivalents	8,416		8,416		11,660
Related Party
Related Party Transaction [Line Items]
Total investments	9,600		9,600		9,600
Related Party \| Brookfield Treasury Management Inc
Related Party Transaction [Line Items]
Cash and cash equivalents	272		272		265
Interest income	11	$ 8	20	$ 17
Investment Management Fees \| Related Party
Related Party Transaction [Line Items]
Related party agreements and transactions	65	$ 52	127	99
Investment Management Fees Payable \| Related Party
Related Party Transaction [Line Items]
Related party agreements and transactions			62		57
Brookfield \| Related Party
Related Party Transaction [Line Items]
Related party agreements and transactions			450	$ 0
Total investments	3,800		3,800		4,200
ANAT and BWS US Holdings LLC Deposit Agreement \| Related Party
Related Party Transaction [Line Items]
Cash and cash equivalents	$ 357		$ 357		$ 532