Other Insurance Liabilities and Separate Accounts - Roll Forward of Separate Accounts (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Separate Account, Liability [Roll Forward]
Separate Accounts liability, beginning of the period	$ 3,250	$ 3,228
Premiums and deposits	661	657
Surrenders and withdrawals	(203)	(7)
Benefit payments	(706)	(714)
Investment earnings	327	42
Net transfers from general account	8	4
Other	(3)	(10)
Separate Accounts liability, end of the period	3,334	3,200
Cash surrender value, end of the period	$ 2,209	$ 2,136