Commitments And Contingencies (Schedule Of Activity Related To Asbestos Claim) (Detail) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2014 USD ($)
Loss Contingencies [Line Items]
Airplane Operating Lease Period Years						five
Fair Value Of Residual Value Guarantee							$ 7.8
Fair Value Of Residual Value Guarantee, Fair Value of Operating Lease Asset Threshold							$ 9.5
Asbestos Commitments and Contingencies
Loss Contingencies [Line Items]
Beginning claims	38,664	42,052	41,090	47,507	47,507
New claims	611	669	2,239	1,960	2,572
Settlements	(187)	(247)	(728)	(768)	(954)
Dismissals	(2,638)	(762)	(6,151)	(6,987)	(8,035)
Ending claims	36,450	41,712	36,450	41,712	41,090	47,507