Pensions and Other Postretirement Benefits (Additional Information) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension settlement charge		$ 0	$ 0	$ 0	$ (190)
Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, expected future contributions, remainder of fiscal year		10		10
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, expected future contributions, remainder of fiscal year		20		20
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit pension plan, decrease for remeasurement due to Settlement	$ 309
Pension settlement charge	$ 190	(1)	0	(9)	(191)
Net periodic benefit cost		6	8	27	213
Pension | Scenario, Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost						$ 35
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost		$ 5	$ 6	$ 16	$ 17
Other Postretirement Benefits | Scenario, Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost						$ 21