Pension And Postretirement Benefits (Employee Benefit Obligation Amounts Recognized) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Noncurrent portion of employee benefit obligation	$ 9,025	$ 8,734
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current portion of employee benefit obligation	0	0
Employee benefit obligation	(3,025)	(3,129)
Net amount recognized	(3,025)	(3,129)
Pension Benefits | International
Defined Benefit Plan Disclosure [Line Items]
Noncurrent portion of employee benefit obligation	157	152
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Current portion of employee benefit obligation	(455)	(521)
Employee benefit obligation	(4,740)	(4,409)
Net amount recognized	(5,195)	(4,930)
Postretirement Benefits | International
Defined Benefit Plan Disclosure [Line Items]
Noncurrent portion of employee benefit obligation	$ 1,103	$ 1,044