Adoption of ASU 2018-12 (Effect of Accounting Adoption to Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2023	Dec. 31, 2022
Reinsurance recoverables		$ 20,317	$ 21,264
Other assets		21,674	19,926
Future contract benefits		(37,860)	(38,302)
DFEL		5,646	5,045
Other liabilities		$ 18,286	$ 14,657
Accounting Standards Update 2018-12 [Member]
DAC, VOBA and DSI	$ 12,162
Reinsurance recoverables	20,713
Future contract benefits	(42,044)
DFEL	3,586
Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
DAC, VOBA and DSI	6,079
Reinsurance recoverables	3,163
Other assets	5,795
Future contract benefits	(3,726)
MRBs, net	(4,300)
DFEL	(3,190)
Other liabilities	(819)
Total	3,002
Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings (Deficit) [Member]
Reinsurance recoverables	607
Other assets	5,795
Future contract benefits	(760)
MRBs, net	(7,956)
Other liabilities	494
Total	(1,820)
Accounting Standards Update 2018-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
DAC, VOBA and DSI	6,079
Reinsurance recoverables	2,556
Future contract benefits	(2,966)
MRBs, net	3,656
DFEL	(3,190)
Other liabilities	(1,313)
Total	$ 4,822