Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 51	$ 38
Expected return on plan assets	(32)	(43)
Amortization of actuarial loss (gain)	21	24
Net periodic cost	40	19
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	3	2
Expected return on plan assets	0	0
Amortization of actuarial loss (gain)	(4)	(3)
Net periodic cost	$ (1)	$ (1)