Pension And Postretirement Benefits (Employee Benefit Obligation Amounts Recognized) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Noncurrent portion of employee benefit obligation	$ 7,260	$ 12,560
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current portion of employee benefit obligation	0	0
Employee benefit obligation	(1,954)	(2,811)
Net amount recognized	(1,954)	(2,811)
Pension Benefits | International
Defined Benefit Plan Disclosure [Line Items]
Noncurrent portion of employee benefit obligation	161	364
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Current portion of employee benefit obligation	(1,058)	(1,106)
Employee benefit obligation	(4,062)	(8,248)
Net amount recognized	(5,120)	(9,354)
Postretirement Benefits | International
Defined Benefit Plan Disclosure [Line Items]
Noncurrent portion of employee benefit obligation	$ 1,083	$ 1,226