Commitments And Contingencies (Schedule Of Activity Related To Asbestos Claim) (Detail) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 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	41,090	47,507	47,507
New claims	980	633	2,572
Settlements	(394)	(208)	(954)
Dismissals	(1,027)	(3,345)	(8,035)
Ending claims	40,649	44,587	41,090	47,507