Pension And Other Postretirement Benefits (Pension Plans With Accumulated Benefit Obligation In Excess Of Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Funded Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 15,738	$ 16,739
Accumulated benefit obligation	13,208	14,022
Fair value of plan assets	11,134	12,782
Funded Pension Plans [Member] | Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	4,037	3,384
Accumulated benefit obligation	3,671	3,264
Fair value of plan assets	3,499	3,219
Unfunded Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	2,436	2,571
Accumulated benefit obligation	1,475	1,535
Unfunded Pension Plans [Member] | Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	6,331	6,915
Accumulated benefit obligation	$ 5,670	$ 6,208