Policyholder Account Balances (Summary of Balances and Changes in Policyholder Account Balances) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Balance as of beginning-of-year			$ 113,972
Interest credited	$ 827	$ 722	2,412	$ 2,121
Balance as of end-of-year	116,777		116,777		$ 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			2,737		3,905
Withdrawals			(1,077)		(1,215)
Policyholder assessments			(3,337)		(4,446)
Net transfers from (to) separate account			90		2
Interest credited			1,101		1,476
Change in fair value of embedded derivative instruments			38		(183)
Balance as of end-of-year	$ 36,810		$ 36,810		$ 37,258
Weighted-average crediting rate	4.00%		4.00%		3.90%
Net Amount at Risk	$ 301,876		$ 301,876		$ 302,481
Cash surrender value	32,685		32,685		33,130
Variable Annuities [Member]
Policyholder Account Balance [Line Items]
Balance as of beginning-of-year			22,184	19,148	19,148
Gross deposits			3,626		5,178
Withdrawals			(508)		(417)
Policyholder assessments			(1)		(2)
Net transfers from (to) separate account			(311)		(492)
Interest credited			391		287
Change in fair value of embedded derivative instruments			1,391		(1,518)
Balance as of end-of-year	$ 26,772		$ 26,772		$ 22,184
Weighted-average crediting rate	2.10%		2.10%		1.40%
Net Amount at Risk	$ 6,235		$ 6,235		$ 7,974
Cash surrender value	25,629		25,629		21,147
Fixed Annuities [Member]
Policyholder Account Balance [Line Items]
Balance as of beginning-of-year			23,338	22,522	22,522
Gross deposits			2,698		3,284
Withdrawals			(2,861)		(2,511)
Policyholder assessments			(41)		(51)
Interest credited			469		532
Change in fair value of embedded derivative instruments			52		(438)
Balance as of end-of-year	$ 23,655		$ 23,655		$ 23,338
Weighted-average crediting rate	2.60%		2.60%		2.40%
Net Amount at Risk	$ 188		$ 188		$ 171
Cash surrender value	22,753		22,753		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			2,026		4,012
Withdrawals			(3,262)		(3,579)
Policyholder assessments			(10)		(13)
Net transfers from (to) separate account			(297)		510
Interest credited			504		629
Balance as of end-of-year	$ 24,099		$ 24,099		$ 25,138
Weighted-average crediting rate	2.70%		2.70%		2.60%
Net Amount at Risk	$ 9		$ 9		$ 15
Cash surrender value	24,094		24,094		25,133
Other [Member]
Policyholder Account Balance [Line Items]
Balance as of beginning-of-year			6,054
Balance as of end-of-year	$ 5,441		$ 5,441		$ 6,054