Reinsurance (Effects of Reinsurance on Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021
Assets
Premiums, reinsurance and other receivables relating to variable interest entities	$ 28,971	$ 17,364		$ 18,169
Market risk benefits, at estimated fair value	286	280
Deferred policy acquisition costs and value of business acquired	20,151	19,653	$ 19,806	20,417
Total assets	49,408	37,297
Liabilities
Net liability for future policy benefits	196,406	187,222		224,358
Policyholder account balances	219,269	210,597
Market risk benefits, at estimated fair value	3,179	3,763		7,901
Other policy-related balances	19,736	18,424		$ 18,032
Other liabilities	35,805	25,933
Total liabilities	255,126	235,342
Direct Reinsurance [Member]
Assets
Premiums, reinsurance and other receivables relating to variable interest entities	6,044	5,427
Market risk benefits, at estimated fair value	279	273
Deferred policy acquisition costs and value of business acquired	20,297	19,522
Total assets	26,620	25,222
Liabilities
Net liability for future policy benefits	192,424	183,377
Market risk benefits, at estimated fair value	3,141	3,591
Other policy-related balances	18,852	17,250
Other liabilities	27,125	18,654
Total liabilities	241,542	222,872
Assumed Reinsurance [Member]
Assets
Premiums, reinsurance and other receivables relating to variable interest entities	1,405	1,505
Market risk benefits, at estimated fair value	7	7
Deferred policy acquisition costs and value of business acquired	353	352
Total assets	1,765	1,864
Liabilities
Net liability for future policy benefits	3,982	3,845
Market risk benefits, at estimated fair value	38	172
Other policy-related balances	1,152	1,183
Other liabilities	1,892	2,006
Total liabilities	7,064	7,206
Ceded Reinsurance [Member]
Assets
Premiums, reinsurance and other receivables relating to variable interest entities	21,522	10,432
Market risk benefits, at estimated fair value	0	0
Deferred policy acquisition costs and value of business acquired	(499)	(221)
Total assets	21,023	10,211
Liabilities
Net liability for future policy benefits	0	0
Market risk benefits, at estimated fair value	0	0
Other policy-related balances	(268)	(9)
Other liabilities	6,788	5,273
Total liabilities	6,520	$ 5,264
Universal Life, Variable Universal Life, and Universal Life with Secondary Guarantees
Liabilities
Other liabilities	$ 770