Policyholder Account Balances (Summary of Balances and Changes in Policyholder Account Balances) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Balance as of beginning-of-year	$ 114,435
Interest credited	785	$ 697
Change in fair value of embedded derivative instrument	(153)	109
Balance as of end-of-period	116,167		$ 114,435
Reinsurance recoverables, net of allowance for credit losses	19,309		19,443
UL and Other [Member]
Policyholder Account Balance [Line Items]
Balance as of beginning-of-year	37,694	38,200	38,200
Gross deposits	926		3,921
Withdrawals	(393)		(1,244)
Policyholder assessments	(1,128)		(4,496)
Net transfers from (to) separate account	32		2
Interest credited	373		1,494
Change in fair value of embedded derivative instrument	29		(183)
Balance as of end-of-period	$ 37,533		$ 37,694
Weighted-average crediting rate	4.00%		3.90%
Net amount at risk	$ 303,412		$ 304,348
Cash surrender value	34,033		34,210
Variable Annuities [Member]
Policyholder Account Balance [Line Items]
Balance as of beginning-of-year	22,184	19,148	19,148
Gross deposits	1,222		5,178
Withdrawals	(170)		(417)
Policyholder assessments			(2)
Net transfers from (to) separate account	(114)		(492)
Interest credited	109		287
Change in fair value of embedded derivative instrument	540		(1,518)
Balance as of end-of-period	$ 23,771		$ 22,184
Weighted-average crediting rate	1.90%		1.40%
Net amount at risk	$ 6,268		$ 7,974
Cash surrender value	22,698		21,147
Fixed Annuities [Member]
Policyholder Account Balance [Line Items]
Balance as of beginning-of-year	23,365	22,552	22,552
Gross deposits	1,317		3,284
Withdrawals	(889)		(2,514)
Policyholder assessments	(15)		(51)
Interest credited	154		532
Change in fair value of embedded derivative instrument	87		(438)
Balance as of end-of-period	$ 24,019		$ 23,365
Weighted-average crediting rate	2.60%		2.40%
Net amount at risk	$ 192		$ 171
Cash surrender value	23,125		22,529
Retirement Plan Services [Member]
Policyholder Account Balance [Line Items]
Balance as of beginning-of-year	25,138	$ 23,579	23,579
Gross deposits	701		4,012
Withdrawals	(1,113)		(3,579)
Policyholder assessments	(3)		(13)
Net transfers from (to) separate account	103		510
Interest credited	168		629
Balance as of end-of-period	$ 24,994		$ 25,138
Weighted-average crediting rate	2.70%		2.60%
Net amount at risk	$ 9		$ 15
Cash surrender value	$ 24,989		$ 25,133