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Investments - Schedule of Residential Mortgage Loans with Credit Quality Indicators, Performing or Nonperforming (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Allowance for expected loan loss	$ (73)	$ (70)	$ (67)	$ (66)
Total CMLs, net of valuation allowance	6,366	5,926
Residential Mortgage
Schedule of Investments [Line Items]
Amortized Cost	$ 3,634	$ 3,274
% of Total	100.00%	100.00%
Allowance for expected loan loss	$ (56)	$ (53)	$ (54)	$ (54)
Total CMLs, net of valuation allowance	3,578	3,221
Performing | Residential Mortgage
Schedule of Investments [Line Items]
Amortized Cost	$ 3,562	$ 3,188
% of Total	98.00%	97.00%
Non-performing | Residential Mortgage
Schedule of Investments [Line Items]
Amortized Cost	$ 72	$ 86
% of Total	2.00%	3.00%

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- Definition

Percentage, before allowance for credit loss, of financing receivable to total financing receivable.

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