Employee Benefits - Net Periodic Benefit Income for Defined Benefit Pension Plans and Other Post-employment Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Compensation And Retirement Disclosure [Abstract]
Service cost		$ (2)
Interest cost	$ (21)	(27)
Expected return on plan assets	21	50
Ongoing net periodic benefit income		21
Income due to settlement	10
Total net periodic benefit income	$ 10	$ 21