Reinsurance (Effects of Reinsurance on Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Premiums and Other Receivables, Net	$ 19,389	$ 18,145
Market risk benefit assets	656	483
Liabilities
Future policy benefits	32,149	31,146	$ 39,830
Policyholder account balances	80,193	72,602	64,290
Market risk benefit liabilities	10,344	10,411	$ 16,062
Other policy-related balances	3,619	3,860
Other liabilities	7,772	6,515
Direct Reinsurance
Assets
Premiums and Other Receivables, Net	289	245
Market risk benefit assets	613	412
Liabilities
Future policy benefits	31,989	31,020
Policyholder account balances	75,893	68,409
Market risk benefit liabilities	9,972	9,980
Other policy-related balances	2,023	2,228
Other liabilities	6,526	5,059
Assumed Reinsurance
Assets
Premiums and Other Receivables, Net	33	30
Market risk benefit assets	0	0
Liabilities
Future policy benefits	160	126
Policyholder account balances	4,300	4,193
Market risk benefit liabilities	372	431
Other policy-related balances	1,596	1,632
Other liabilities	11	22
Ceded Reinsurance
Assets
Premiums and Other Receivables, Net	19,067	17,870
Market risk benefit assets	43	71
Liabilities
Future policy benefits	0	0
Policyholder account balances	0	0
Market risk benefit liabilities	0	0
Other policy-related balances	0	0
Other liabilities	$ 1,235	$ 1,434