Liabilities, Commitments And Contingencies (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Accrued compensation and employee benefit costs	$ 6,659	$ 5,720
Environmental	524	562	$ 566
Product warranties	1,211	1,414	$ 1,485
Forward loss recognition	1,683	1,385
Dividends payable	1,005	866
Taxes Payable	380	89
Other	3,830	4,655
Total	$ 15,292	$ 14,691