Other Insurance Liabilities and Separate Accounts - Roll Forward of Separate Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Separate Account, Liability [Roll Forward]
Separate Accounts liability, beginning of the period	$ 3,228	$ 5,087
Premiums and deposits	860	853
Surrenders and withdrawals	(9)	(581)
Benefit payments	(938)	(947)
Investment earnings	100	(1,130)
Net transfers from general account	7	9
Other	2	(63)
Separate Accounts liability, end of the period	3,250	3,228
Cash surrender value, end of the period	$ 2,181	$ 2,087