Future Contract Benefit (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 LFBP [Abstract]
Net balance as of end-of-period	$ 39,757	$ 38,826
Traditional Life [Member]
Present Value of Expected Net Premiums [Abstract]
Balance as of beginning-of-period	6,063	6,858
Beginning balance of original discount rate	6,645	5,975
Effect of changes in cash flow assumptions			$ (484)
Effect of actual variances from expected experience		(241)	50
Adjusted balance as of beginning-of-year	6,404	5,541
Issuances	176	1,656
Interest accrual	60	222
Net premium collected	(203)	(765)
Flooring impact of LFPB	2	(9)
Ending balance of original discount rate	6,439	6,645
Effect of cumulative changes in discount rate assumptions	(230)	(582)
Balance as of end-of-period	6,209	6,063
Present Value of Expected LFBP [Abstract]
Balance as of beginning-of-period	9,572	11,008
Beginning balance of original discount rate	10,357	9,447
Effect of changes in cash flow assumptions			(415)
Effect of actual variances from expected experience		(251)	69
Adjusted balance as of beginning-of-period	10,106	9,101
Issuance	177	1,655
Interest accrual	95	356
Benefit payments	(186)	(755)
Ending balance of original discount rate	10,192	10,357
Effect of changes in discount rate assumptions	(302)	(785)
Balance as of end-of-period	9,890	9,572
Net balance as of end-of-period	3,681	3,509
Less: reinsurance recoverables	520	532
Net balance as of end-of-period, net of reinsurance	$ 3,161	$ 2,977
Weighted-average duration of future policyholder benefit liability (years)	10 years	10 years
Payout Annuities [Member]
Present Value of Expected LFBP [Abstract]
Balance as of beginning-of-period	$ 2,004	$ 2,512
Beginning balance of original discount rate	2,267	2,246
Effect of actual variances from expected experience		(1)	3
Adjusted balance as of beginning-of-period	2,266	2,249
Issuance	27	122
Interest accrual	21	84
Benefit payments	(46)	(188)
Ending balance of original discount rate	2,268	2,267
Effect of changes in discount rate assumptions	(200)	(263)
Balance as of end-of-period	2,068	2,004
Net balance as of end-of-period	2,068	2,004
Less: reinsurance recoverables	3	3
Net balance as of end-of-period, net of reinsurance	$ 2,065	$ 2,001
Weighted-average duration of future policyholder benefit liability (years)	9 years	9 years
Deferred Profit Liability	$ 43	$ 38	22
UL and Other [Member]
Present Value of Expected LFBP [Abstract]
Balance as of beginning-of-period	14,818	12,556
Balance as of beginning-of-year, excluding shadow balance in AOCI	15,723	11,443
Effect of changes in cash flow assumptions			3,108
Effect of actual variances from expected experience		(9)	195
Adjusted balance as of beginning-of-period	15,714	14,746
Issuance		7
Interest accrual	186	626
Net assessments collected	336	972
Benefit payments	(183)	(628)
Balance as of end-of-period, excluding shadow balance in AOCI	16,053	15,723
Balance as of end-of-period	15,384	14,818
Net balance as of end-of-period	15,384	14,818
Less: reinsurance recoverables	862	856
Net balance as of end-of-period, net of reinsurance	14,522	13,962
Group Protection [Member]
Present Value of Expected LFBP [Abstract]
Balance as of beginning-of-period	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-period	5,959	5,572
Issuance	437	1,777
Interest accrual	42	141
Benefit payments	(377)	(1,431)
Ending balance of original discount rate	6,061	6,059
Effect of changes in discount rate assumptions	(569)	(597)
Balance as of end-of-period	5,492	5,462
Net 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
Weighted-average duration of future policyholder benefit liability (years)	4 years	4 years