Pension And Other Postretirement Benefits (Summary Of Assets In Excess Of/(Less Than) Benefit Obligation) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan funded status of plan		$ (4,604)	$ (3,957)
Unfunded plans		(2,436)	(2,571)
Total	[1]	(7,040)	(6,528)
Pension Benefits - Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan funded status of plan		439	413
Unfunded plans		(6,331)	(6,915)
Total	[1]	$ (5,892)	$ (6,502)

[1] Fair value of assets less benefit obligation shown on the preceding page.