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	$ 113,972
Interest credited	781	$ 693
Balance as of end-of-year	115,714		$ 113,972
UL and Other [Member]
Policyholder Account Balance [Line Items]
Balance as of beginning-of-year	37,258	37,719	37,719
Gross deposits	922		3,905
Withdrawals	(387)		(1,215)
Policyholder assessments	(1,117)		(4,446)
Net transfers from (to) separate account	32		2
Interest credited	369		1,476
Change in fair value of embedded derivative instrument	29		(183)
Balance as of end-of-year	$ 37,106		$ 37,258
Weighted-average crediting rate	4.00%		3.90%
Net Amount at Risk	$ 301,582		$ 302,481
Cash surrender value	32,960		33,130
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-year	$ 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 Annuity [Member]
Policyholder Account Balance [Line Items]
Balance as of beginning-of-year	23,338	22,522	22,522
Gross deposits	1,317		3,284
Withdrawals	(889)		(2,511)
Policyholder assessments	(15)		(51)
Interest credited	154		532
Change in fair value of embedded derivative instrument	88		(438)
Balance as of end-of-year	$ 23,993		$ 23,338
Weighted-average crediting rate	2.60%		2.40%
Net Amount at Risk	$ 192		$ 171
Cash surrender value	23,099		22,502
Retirement Plan Services Segment [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-year	$ 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
Other [Member]
Policyholder Account Balance [Line Items]
Balance as of beginning-of-year	6,054
Balance as of end-of-year	$ 5,850		$ 6,054