Receivables (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, net	$ 8,061	$ 5,877
U.S. Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts billed	1,492	1,434
Unbilled costs and accrued profits	5,734	4,577
Less: customer advances and progress payments	(1,311)	(1,012)
Receivables, net	5,915	4,999
Other governments and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts billed	772	460
Unbilled costs and accrued profits	1,995	671
Less: customer advances and progress payments	(621)	(253)
Receivables, net	$ 2,146	$ 878