Policyholder Account Balances, Future Policy Benefits and Claims - Amounts Recognized in Statement of Operations (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	$ 318	$ 530	$ 528
Interest Expense	193	390	398
Life contingent payout annuities
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	83	45	39
Interest Expense	24	49	53
Term and whole life insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	84	169	166
Interest Expense	19	39	41
Disability insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	62	127	131
Interest Expense	15	31	30
Long term care insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	89	189	192
Interest Expense	$ 135	$ 271	$ 274