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Investments - Schedule of Commercial Mortgage Loan Investment (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
Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	2,805	2,722
Allowance for expected loan loss	(17)	(17)	$ (13)	$ (12)
Total CMLs, net of valuation allowance	$ 2,788	$ 2,705
% of Total	100.00%	100.00%
East North Central | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 99	$ 98
% of Total	4.00%	4.00%
East South Central | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 75	$ 75
% of Total	3.00%	3.00%
Middle Atlantic | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 348	$ 354
% of Total	12.00%	13.00%
Mountain | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 409	$ 409
% of Total	15.00%	15.00%
New England | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 164	$ 164
% of Total	6.00%	6.00%
Pacific | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 726	$ 706
% of Total	26.00%	26.00%
South Atlantic | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 742	$ 683
% of Total	26.00%	25.00%
West North Central | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 62	$ 62
% of Total	2.00%	2.00%
West South Central | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 180	$ 171
% of Total	6.00%	6.00%
Hotel | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 17	$ 17
% of Total	1.00%	1.00%
Industrial | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 657	$ 657
% of Total	23.00%	24.00%
Mixed Use | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 11	$ 11
% of Total	0.00%	0.00%
Multifamily | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 1,024	$ 1,006
% of Total	37.00%	37.00%
Office | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 349	$ 349
% of Total	12.00%	13.00%
Retail | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 75	$ 98
% of Total	3.00%	4.00%
Student Housing | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 83	$ 83
% of Total	3.00%	3.00%
Other | Commercial Mortgage
Schedule of Investments [Line Items]
Total CMLs, gross of valuation allowance	$ 589	$ 501
% of Total	21.00%	18.00%

X

- Definition

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

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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