Benefit Plans - Summary of the Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net periodic pension cost:
Service cost	$ 93	$ 139
Interest cost	111	88
Estimated return on plan assets	228	269
Net amortization and other	(20)	(8)
Net periodic benefit cost (income)	$ (4)	$ (34)