Other Insurance Liabilities and Separate Accounts - Roll Forward of Separate Accounts (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Separate Account, Liability [Roll Forward]
Separate Accounts liability, beginning of the period	$ 3,311	$ 3,250
Premiums and deposits	236	201
Surrenders and withdrawals	(1,309)	(93)
Benefit payments	(243)	(223)
Investment earnings	(61)	128
Net transfers from general account	3	2
Other	(13)	6
Separate Accounts liability, end of the period	1,924	3,271
Cash surrender value, end of the period	$ 844	$ 2,201