Pensions and Other Postretirement Benefits (Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 2
Interest cost	25	26
Expected return on plan assets	(26)	(27)
Amortization of actuarial losses	6	6
Amortization of prior service credit	0	0
Pension settlement charge	1	0
Net periodic benefit cost	8	7
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	5	6
Expected return on plan assets	0	0
Amortization of actuarial losses	0	0
Amortization of prior service credit	(1)	(2)
Pension settlement charge	0	0
Net periodic benefit cost	$ 5	$ 5