Receivables (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, net	$ 8,202	$ 7,254
U.S. Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts billed	792	1,205
Unbilled costs and accrued profits	6,877	5,243
Less: customer advances and progress payments	(1,346)	(1,193)
Receivables, net	6,323	5,255
Other governments and commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts billed	546	704
Unbilled costs and accrued profits	1,847	1,888
Less: customer advances and progress payments	(514)	(593)
Receivables, net	$ 1,879	$ 1,999