Commitments And Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) agreement employee	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Commitments and Contingencies [Line Items]
Total expense under operating leases | $	$ 283	$ 297	$ 309
Letters of credit | $	$ 1,100
Number of company-negotiated labor agreements | agreement	53
Number of collective agreements expected to be renegotiated | agreement	18
Number of employees covered by expected renegotiated collective agreements | employee	6,400
Maximum
Commitments and Contingencies [Line Items]
Period preceding delivery of aircraft to customer fair market value of trade-in aircraft is established, days, maximum	45 days
Unionized Employees Concentration Risk
Commitments and Contingencies [Line Items]
Percent of employees represented by labor organizations	17.00%