Pensions and Other Postretirement Benefits (Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Pension settlement charge	$ 0	$ 190
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2
Interest cost	26	31
Expected return on plan assets	(27)	(31)
Amortization of actuarial losses	6	7
Amortization of prior service credit	0	0
Pension settlement charge	0	190
Net periodic benefit cost	7	199
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	6	7
Expected return on plan assets	0	0
Amortization of actuarial losses	0	0
Amortization of prior service credit	(2)	(2)
Pension settlement charge	0	0
Net periodic benefit cost	$ 5	$ 6