Other Insurance Liabilities and Separate Accounts - Roll Forward of Separate Accounts (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Separate Account, Liability [Roll Forward]
Separate Accounts liability, beginning of the period	$ 3,228	$ 5,087
Premiums and deposits	657	636
Surrenders and withdrawals	(7)	(576)
Benefit payments	(714)	(711)
Investment (earnings) losses	42	(1,057)
Net transfers from general account	4	7
Other	(10)	(68)
Separate Accounts liability, end of the period	3,200	3,318
Cash surrender value, end of the period	$ 2,136	$ 2,153