Summary of Significant Accounting Policies - Allowance For Credit Loss (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed income securities	$ 13	$ 6	$ 2
Investments	77	73
Premium installment receivables	132	107	153
Reinsurance recoverables	65	74
Other assets	19	26
Assets	293	280
Commitments to fund mortgage loans and bank loans	0	0
Liabilities	0	0
Total	293	280
Fixed income securities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed income securities	13	6	2	$ 0
Mortgage loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance credit losses	7	6	$ 67	$ 3
Bank loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance credit losses	$ 57	$ 61