Pension and Other Postretirement Benefits (Amounts Recognized in Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Defined benefit postretirement plan obligations	$ (1,157)	$ (1,102)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	22	0
Current liabilities	(11)	(8)
Defined benefit postretirement plan obligations	(538)	(473)
Accrued benefit cost	(527)	(481)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(50)	(50)
Defined benefit postretirement plan obligations	(619)	(629)
Accrued benefit cost	$ (669)	$ (679)