Employee Benefits - Schedule of Net Periodic Benefit (Income) Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Plans
Components of net periodic (benefit) expense
Service cost	$ 6	$ 11	$ 12	$ 23
Interest cost	67	50	135	102
Expected return on plan assets	(72)	(102)	(143)	(202)
Recognition of prior service credit	(1)	(2)	(3)	(5)
Recognition of actuarial loss	26	30	51	67
Net periodic post-retirement benefit expense	26	(13)	52	(15)
Post-Retirement Benefit Plans
Components of net periodic (benefit) expense
Service cost	2	2	3	5
Interest cost	25	15	51	30
Recognition of prior service credit	(2)	2	(4)	4
Recognition of actuarial loss	(5)	0	(10)	0
Net periodic post-retirement benefit expense	$ 20	$ 19	$ 40	$ 39