Separate Accounts (Summary of Balances and changes in Separate Account Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Separate Account Investment [Line Items]
Balance as of beginning-of-year	$ 143,536
Balance as of end-of-year	148,421	$ 143,536
UL and Other [Member]
Fair Value, Separate Account Investment [Line Items]
Balance as of beginning-of-year	20,920	24,785
Gross Deposits	394	1,900
Withdrawals	(75)	(454)
Policyholder assessments	(238)	(938)
Change in market performance	1,193	(4,371)
Net transfer from (to) general account	(32)	(2)
Balance as of end-of-year	22,162	20,920
Cash surrender value	19,863	18,666
Variable Annuities [Member]
Fair Value, Separate Account Investment [Line Items]
Balance as of beginning-of-year	105,573	136,665
Gross Deposits	624	3,371
Withdrawals	(2,436)	(9,238)
Policyholder assessments	(624)	(2,603)
Change in market performance	5,054	(23,194)
Net transfer from (to) general account	143	572
Balance as of end-of-year	108,334	105,573
Cash surrender value	106,796	103,987
Retirement Plan Services [Member]
Fair Value, Separate Account Investment [Line Items]
Balance as of beginning-of-year	16,996	21,068
Gross Deposits	554	2,378
Withdrawals	(586)	(2,378)
Policyholder assessments	(40)	(164)
Change in market performance	978	(3,710)
Net transfer from (to) general account	(26)	(198)
Balance as of end-of-year	17,876	16,996
Cash surrender value	$ 17,862	$ 16,982