Liability for Future Policy Benefit (Details) - Life policy reserves: - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Term Life Insurance
Present value of expected net premiums:
Balance, beginning of period	$ 1,643	$ 1,801
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance			$ 1,708	$ 1,503
Effect of changes in cash flow assumptions			0	(4)
Effect of actual variances from expected experience			(3)	11
Adjusted beginning of period balance	1,705	1,510
Issuances	38	59
Interest accrual	18	15
Net premiums collected	(46)	(42)
Ending balance at original discount rate	1,715	1,542
Effect of changes in discount rate assumptions	(16)	144
Balance, end of period	1,699	1,686
Present value of expected future policy benefits:
Balance, beginning of period	2,584	2,993
Beginning balance at original discount rate			2,692	2,425
Effect of changes in cash flow assumptions			0	(4)
Effect of actual variances from expected experience			(2)	18
Adjusted beginning of period balance	2,690	2,439
Issuances	38	59
Interest accrual	30	27
Benefits paid	(46)	(62)
Ending balance at original discount rate	2,712	2,463
Effect of changes in discount rate assumptions	(21)	282
Balance, end of period	2,691	2,745
Net liability for future policy benefits:
Present value of expected future policy benefits less expected net premiums	992	1,059
Impact of flooring at cohort level	19	20
Net life policy reserves	1,011	1,079
Less reinsurance recoverable at original discount rate	(96)	(100)
Less effect of discount rate assumption changes on reinsurance recoverable	(10)	(14)
Net life policy reserves, after reinsurance recoverable	$ 905	$ 965
Weighted-average duration of the net life policy reserves	12 years	12 years
Whole Life Insurance
Present value of expected net premiums:
Balance, beginning of period	$ 208	$ 241
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance			217	201
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			1	0
Adjusted beginning of period balance	218	201
Issuances	7	11
Interest accrual	2	2
Net premiums collected	(7)	(7)
Ending balance at original discount rate	220	207
Effect of changes in discount rate assumptions	(3)	19
Balance, end of period	217	226
Present value of expected future policy benefits:
Balance, beginning of period	614	826
Beginning balance at original discount rate			607	577
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			$ 1	$ 0
Adjusted beginning of period balance	608	577
Issuances	6	11
Interest accrual	8	7
Benefits paid	(8)	(9)
Ending balance at original discount rate	614	586
Effect of changes in discount rate assumptions	30	150
Balance, end of period	644	736
Net liability for future policy benefits:
Present value of expected future policy benefits less expected net premiums	427	510
Impact of flooring at cohort level	0	0
Net life policy reserves	427	510
Less reinsurance recoverable at original discount rate	(25)	(27)
Less effect of discount rate assumption changes on reinsurance recoverable	(6)	(11)
Net life policy reserves, after reinsurance recoverable	$ 396	$ 472
Weighted-average duration of the net life policy reserves	16 years	18 years