Pensions and Other Postretirement Benefits (Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Pension settlement charge		$ 0	$ 0	$ 0	$ 190
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost		2	2	6	6
Interest cost		25	28	77	83
Expected return on plan assets		(28)	(28)	(82)	(83)
Amortization of actuarial (gains) losses		6	6	17	16
Pension settlement charge	$ (190)	1	0	9	191
Net periodic benefit cost		6	8	27	213
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost		1	1	3	3
Interest cost		5	7	17	20
Amortization of actuarial (gains) losses		0	0	(1)	(1)
Amortization of prior service credit		(1)	(2)	(3)	(5)
Net periodic benefit cost		$ 5	$ 6	$ 16	$ 17