Fair Value - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in unrealized capital losses included in OCI associated with Level 3 financial assets	$ 9	$ 9
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross transfers into Level 3	0	0
Gross transfers out of Level 3	50	29
Level 3 | Recurring | Separate Accounts, financial assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross transfers into Level 3	0	0
Gross transfers out of Level 3	$ 0	$ 0