General - Schedule of impact of adoption to AOCI and net income (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Impact of adoption [Line Items]
Total decrease in equity	$ 17,373	$ 17,363	$ 23,001
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	50,388	50,970	53,686	$ 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	$ (1,673)	$ (2,392)	$ (1,088)	$ 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)