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Investments - Schedule of Commercial Mortgage Loan Investment (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Allowance for expected loan loss	$ (69)	$ (64)	$ (66)	$ (64)	$ (64)	$ (42)
Total commercial mortgage loans, net of valuation allowance	5,626		5,336
Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	2,590		2,550
Allowance for expected loan loss	(18)	$ (14)	(12)	$ (15)	$ (13)	$ (10)
Total commercial mortgage loans, net of valuation allowance	$ 2,572		$ 2,538
% of Total	100.00%		100.00%
East North Central | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 98		$ 151
% of Total	4.00%		6.00%
East South Central | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 75		$ 75
% of Total	3.00%		3.00%
Middle Atlantic | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 354		$ 354
% of Total	14.00%		14.00%
Mountain | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 409		$ 352
% of Total	16.00%		14.00%
New England | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 164		$ 168
% of Total	6.00%		6.00%
Pacific | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 713		$ 766
% of Total	27.00%		30.00%
South Atlantic | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 595		$ 563
% of Total	23.00%		22.00%
West North Central | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 22		$ 4
% of Total	1.00%		0.00%
West South Central | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 160		$ 117
% of Total	6.00%		5.00%
Hotel | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 17		$ 18
% of Total	1.00%		1.00%
Industrial | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 617		$ 616
% of Total	24.00%		24.00%
Mixed Use | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 11		$ 11
% of Total	0.00%		0.00%
Multifamily | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 1,006		$ 1,012
% of Total	39.00%		40.00%
Office | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 356		$ 316
% of Total	14.00%		13.00%
Retail | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 99		$ 102
% of Total	4.00%		4.00%
Student Housing | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 83		$ 83
% of Total	3.00%		3.00%
Other | Commercial Mortgage Loans
Schedule of Investments [Line Items]
Total commercial mortgage loans, gross of valuation allowance	$ 401		$ 392
% of Total	15.00%		15.00%

X

- Definition

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

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