Future Contract Benefits (Summary of Changes in Present values of Expected Net Premiums and LFPB) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Present Value of Expected LFPB
Net balance as of end-of-period	$ 39,245	$ 38,302
Traditional Life [Member]
Present Value of Expected Net Premiums
Balance as of beginning-of-year	5,896	6,610
Beginning balance of original discount rate	6,480	5,767
Effect of changes in cash flow assumptions		(382)
Effect of actual variances from expected experience	(234)	(21)
Adjusted beginning-of-year balance	6,246	5,364
Issuances	177	1,655
Interest accrual	57	209
Net premiums collected	(195)	(742)
Flooring impact of LFPB	(1)	6
Ending balance at original discount rate	6,286	6,480
Effect of changes in discount rate assumptions	(235)	(584)
Balance as of end-of-period	6,051	5,896
Present Value of Expected LFPB
Balance as of beginning-of-year	9,086	10,353
Beginning balance of original discount rate	9,879	8,893
Effect of changes in cash flow assumptions		(321)
Effect of actual variances from expected experience	(243)	(5)
Adjusted balance as of beginning-of-year	9,636	8,567
Issuances	177	1,655
Interest Accrual	89	326
Benefit Payment	(169)	(669)
Ending balance at original discount rate	9,733	9,879
Effect of cumulative changes in discount rate assumptions	(316)	(793)
Balance as of end-of-period	9,417	9,086
Net balance as of end-of-period	3,366	3,190
Less: reinsurance recoverables	270	270
Net balance as of end-of-period, net of reinsurance	$ 3,096	$ 2,920
Liability for Future Policy Benefit, Weighted-Average Duration	11 years	11 years
Payout Annuities [Member]
Present Value of Expected Net Premiums
Deferred Profit Liability	$ 43	$ 38	$ 22
Present Value of Expected LFPB
Balance as of beginning-of-year	2,003	2,511
Beginning balance of original discount rate	2,266	2,245
Effect of actual variances from expected experience	(1)	3
Adjusted balance as of beginning-of-year	2,265	2,248
Issuances	27	122
Interest Accrual	21	84
Benefit Payment	(46)	(188)
Ending balance at original discount rate	2,267	2,266
Effect of cumulative changes in discount rate assumptions	(200)	(263)
Balance as of end-of-period	2,067	2,003
Net balance as of end-of-period	2,067	2,003
Less: reinsurance recoverables	10	10
Net balance as of end-of-period, net of reinsurance	$ 2,057	$ 1,993
Liability for Future Policy Benefit, Weighted-Average Duration	9 years	9 years
UL and Other [Member]
Present Value of Expected LFPB
Balance as of beginning-of-year	$ 14,777	$ 12,513
Balance as of beginning-of-year, excluding shadow balance in AOCI	15,682	11,400
Effect of changes in cash flow assumptions		3,108
Effect of actual variances from expected experience	(9)	195
Adjusted balance as of beginning-of-year	15,673	14,703
Issuances		7
Interest Accrual	186	626
Net assessments collected	337	974
Benefit Payment	(183)	(628)
Balance as of end-of-period, excluding shadow balance in AOCI	16,013	15,682	$ 11,400
Balance as of end-of-period	15,344	14,777
Less: reinsurance recoverables	2,007	1,975
Net balance as of end-of-period, net of reinsurance	$ 13,337	$ 12,802
Liability for Future Policy Benefit, Weighted-Average Duration	17 years	17 years
Group Protection [Member]
Present Value of Expected LFPB
Balance as of beginning-of-year	$ 5,462	$ 5,936
Beginning balance of original discount rate	6,059	5,674
Effect of changes in cash flow assumptions		15
Effect of actual variances from expected experience	(100)	(117)
Adjusted balance as of beginning-of-year	5,959	5,572
Issuances	437	1,777
Interest Accrual	42	141
Benefit Payment	(377)	(1,431)
Ending balance at original discount rate	6,061	6,059
Effect of cumulative changes in discount rate assumptions	(569)	(597)
Balance as of end-of-period	5,492	5,462
Less: reinsurance recoverables	126	127
Net balance as of end-of-period, net of reinsurance	$ 5,366	$ 5,335
Liability for Future Policy Benefit, Weighted-Average Duration	4 years	4 years