Employee Benefits - Net Pension Cost (Benefit) for All Funded and Unfunded Plans (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Interest cost on PBO	$ 7	$ 6
Expected return on plan assets	(7)	(7)
Amortization of losses	4	5
Settlement loss	0	0
Net pension cost	$ 4	$ 4