Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Settlements	$ 0	$ 1
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	20	12
Expected return on plan assets	(19)	(20)
Recognized net actuarial loss	7	13
Settlements	0	1
Net periodic cost (benefit)	9	7
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	2	1
Recognized net actuarial loss	(1)	0
Amortization of prior service benefit	(2)	(2)
Net periodic cost (benefit)	$ (1)	$ (1)