Employee Benefit Plans - Components of Net Periodic Cost (Income) (Details) - Pension Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 27	$ 27	$ 21
Interest cost	64	77	90
Expected return on plan assets	(130)	(121)	(122)
Amortization of prior service credit	1	1	1
Amortization of net actuarial loss	40	34	17
Curtailment / settlement loss	2	10	9
Net periodic cost	$ 4	$ 28	$ 16