Investments - Schedule of RMLs with Credit Quality Indicators, Performing or Nonperforming (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Allowance for expected credit loss	$ (66)	$ (42)	$ (31)	$ (39)
Total RMLs, net of valuation allowance	5,336	4,554
Residential Mortgage Loans
Schedule of Investments [Line Items]
Amortized Cost	$ 2,852	$ 2,180
% of Total	100.00%	100.00%
Allowance for expected credit loss	$ (54)	$ (32)	$ (25)	$ (37)
Allowance for expected credit loss, percent	0.00%	0.00%
Total RMLs, net of valuation allowance	$ 2,798	$ 2,148
Financing receivable, allowance for credit loss to outstanding, percent	100.00%	100.00%
Performing Financial Instruments | Residential Mortgage Loans
Schedule of Investments [Line Items]
Amortized Cost	$ 2,795	$ 2,118
% of Total	98.00%	97.00%
Nonperforming Financial Instruments | Residential Mortgage Loans
Schedule of Investments [Line Items]
Amortized Cost	$ 57	$ 62
% of Total	2.00%	3.00%