Employee Benefits - Schedule of Net Periodic Benefit (Income) Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension Plans
Components of net periodic (benefit) expense
Service cost	$ 12	$ 13
Interest cost	52	50
Expected return on plan assets	(100)	(138)
Recognition of prior service credit	(3)	(2)
Recognition of actuarial loss	37	49
Net periodic benefit expense (income)	(2)	(28)
Post-Retirement Benefit Plans
Components of net periodic (benefit) expense
Service cost	3	4
Interest cost	15	12
Recognition of prior service credit	2	4
Recognition of actuarial loss	0	1
Net periodic benefit expense (income)	$ 20	$ 21