Reserve for Future Policy Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Reserve for future policy benefits	$ 508	$ 592	$ 502	$ 646	$ 723	$ 638
Life Conversions
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	46	52	47	58
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change	113	136	112	152
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax	(12)	5	(14)	19
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance			126	133
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			2	1
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change	125	131	128	134
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense	4	4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment	(7)	(7)
Reserve for future policy benefits	$ 67	$ 84				94
Liability for Future Policy Benefit, Weighted-Average Duration	12 years 3 months 18 days	14 years 1 month 6 days
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	$ 208	$ 221
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	$ 118	$ 126
Additional Liability, Long-Duration Insurance, Weighted-Average Interest Accretion Rate	4.20%	4.10%
Additional Liability, Long-Duration Insurance, Current Weighted-Average Discount Rate	5.10%	3.80%
Paid Up Life
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change	$ 192	$ 234	192	262
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax	(35)	(11)	(39)	14
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance			231	248
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			0	0
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change	227	245	231	248
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense	2	2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment	(6)	(5)
Reserve for future policy benefits	$ 192	$ 234				267
Liability for Future Policy Benefit, Weighted-Average Duration	6 years 6 months	7 years 6 months
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	$ 295	$ 319
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	$ 0	$ 0
Additional Liability, Long-Duration Insurance, Weighted-Average Interest Accretion Rate	2.90%	2.90%
Additional Liability, Long-Duration Insurance, Current Weighted-Average Discount Rate	5.00%	3.30%
Deferred Profit Liability
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Reserve for future policy benefits	$ 19	$ 20				0
Fixed Annuity
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change	143	169	140	188
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax	8	28	4	47
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance			136	141
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			0	1
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change	135	141	$ 136	$ 142
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense	2	2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment	(3)	(3)
Reserve for future policy benefits	$ 143	$ 169				189
Liability for Future Policy Benefit, Weighted-Average Duration	9 years 1 month 6 days	9 years 2 months 12 days
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	$ 269	$ 281
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	$ 0	$ 0
Additional Liability, Long-Duration Insurance, Weighted-Average Interest Accretion Rate	5.60%	5.60%
Additional Liability, Long-Duration Insurance, Current Weighted-Average Discount Rate	5.00%	3.70%
Long-Duration Insurance, Other
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Reserve for future policy benefits	$ 87	$ 85				$ 88