Employee Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Retirement Benefits [Abstract]
Service cost	$ 1	$ 1	$ 1	$ 2
Interest cost	12	10	25	21
Expected return on assets	(22)	(26)	(44)	(52)
Amortization of prior service credit / actuarial loss	3	5	6	9
Net periodic benefit cost	$ (6)	$ (10)	$ (12)	$ (20)