Income Taxes - Components of income tax expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Components of income tax expense (benefit)
Current	$ (36)	$ 841	$ 1,480
Deferred	(458)	448	(107)
Total income tax (benefit) expense	$ (494)	$ 1,289	$ 1,373