Separate Accounts (Net Amount at Risk and Cash Surrender Value) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	$ 80,193	$ 72,602
Separate account liabilities	81,690	78,880
Universal Life Insurance
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	1,980	2,100	$ 2,134	$ 2,110
Separate account liabilities	2,276	1,970	2,576
Total account balances	4,256	4,070	4,710
Net amount at risk	22,214	23,818	24,995
Cash surrender value	4,049	3,789	4,407
Variable Annuities
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	4,111	4,664	4,475	4,605
Separate account liabilities	77,086	74,845	101,108	99,257
Total account balances	81,197	79,509	105,583
Net amount at risk	13,156	16,334	6,316
Cash surrender value	80,756	79,222	105,574
Index-linked Annuities
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	41,627	33,897	32,000	23,274
Separate account liabilities	0	0	0
Total account balances	41,627	33,897	32,000
Cash surrender value	39,270	31,293	29,848
Fixed Rate Annuities
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	14,672	14,274	11,849	12,349
Separate account liabilities	0	0	0
Total account balances	14,672	14,274	11,849
Cash surrender value	14,068	13,723	11,112
ULSG
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	5,052	5,307	5,569	5,823
Separate account liabilities	0	0	0
Total account balances	5,052	5,307	5,569
Net amount at risk	65,299	66,926	68,905
Cash surrender value	4,498	4,671	4,821
Company-Owned Life Insurance
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	653	641	646	679
Separate account liabilities	2,148	1,919	2,367	$ 2,253
Total account balances	2,801	2,560	3,013
Net amount at risk	2,644	3,368	3,665
Cash surrender value	$ 2,579	$ 2,344	$ 2,794