Policyholder Account Balances, Future Policy Benefits and Claims - Amounts Recognized in Statement of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	$ 674	$ 530	$ 528
Interest Expense	388	390	398
Life contingent payout annuities
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	196	45	39
Interest Expense	49	49	53
Term and whole life insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	169	169	166
Interest Expense	37	39	41
Disability Income Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	124	127	131
Interest Expense	32	31	30
Long term care insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	185	189	192
Interest Expense	$ 270	$ 271	$ 274