General - Schedule of Impact of Adoption to After-Tax Cumulative Effect of Change in Accounting Principle on Transition Date (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Impact of adoption [Line Items]
Total decrease in equity	$ 14,447		$ 17,363	$ 17,571
Cumulative Effect of Change in Accounting Principle
Impact of adoption [Line Items]
Total decrease in equity							$ 298
Decrease in retained income
Impact of adoption [Line Items]
Total decrease in equity	48,491	$ 48,766	50,970	51,499	$ 52,412	$ 53,288
Decrease in retained income | Cumulative Effect of Change in Accounting Principle
Impact of adoption [Line Items]
Total decrease in equity							(21)
Decrease in accumulated other comprehensive income (“AOCI”)
Impact of adoption [Line Items]
Total decrease in equity	$ (2,570)	$ (1,914)	$ (2,392)	$ (3,042)	$ (2,209)	$ 426
Decrease in accumulated other comprehensive income (“AOCI”) | Cumulative Effect of Change in Accounting Principle
Impact of adoption [Line Items]
Total decrease in equity							$ (277)