Inventories (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Inventory [Line Items]
Work-in-process, primarily related to long-term contracts and programs in progress	$ 7,864	$ 8,081
Spare parts, used aircraft and general stock materials	833	1,030
Other inventories	719	740
Total inventories	9,416	9,851
Less: customer advances and progress payments	(4,746)	(5,032)
Total inventories, net	$ 4,670	$ 4,819