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Investments - Schedule of Residential Mortgage Loans with Credit Quality Indicators, Performing or Nonperforming (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
Residential Mortgage Loans
Schedule of Investments [Line Items]
Amortized Cost	$ 3,105		$ 2,852
% of Total	100.00%		100.00%
Allowance for expected loan loss	$ (51)	$ (50)	$ (54)	$ (49)	$ (51)	$ (32)
Total commercial mortgage loans, net of valuation allowance	3,054		2,798
Performing | Residential Mortgage Loans
Schedule of Investments [Line Items]
Amortized Cost	$ 3,031		$ 2,795
% of Total	98.00%		98.00%
Non-performing | Residential Mortgage Loans
Schedule of Investments [Line Items]
Amortized Cost	$ 74		$ 57
% of Total	2.00%		2.00%

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

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